Complete Publications

This paper represents Handel's early PhD thesis work on instabilities, turbulence and flicker-noise in semiconductors Part 1, focusing on instabilities without considering magnetic fields. The research establishes theoretical foundations for understanding plasma instabilities in semiconductor materials as a source of low-frequency noise, analyzing current-driven instabilities, charge carrier turbulence, and their manifestation as 1/f noise characteristics in semiconductor devices, forming the first part of a comprehensive three-part series that constituted Handel's doctoral dissertation.

This paper represents the second part of Handel's PhD thesis on instabilities, turbulence and flicker-noise in semiconductors, focusing on current instabilities induced by their own magnetic field. The research extends the instability analysis by including self-generated magnetic field effects from high current densities in semiconductors, showing how current flow creates magnetic fields that couple back to modify carrier dynamics and produce additional instability mechanisms contributing to 1/f noise and turbulent behavior in semiconductor devices.

This paper presents the third part of Handel's PhD thesis on instabilities, turbulence and flicker-noise in semiconductors, focusing specifically on turbulence in semiconductor plasma and its relationship to 1/f noise. The work develops a theoretical framework connecting plasma turbulence phenomena in semiconductors to the observed low-frequency 1/f noise characteristics, building upon the magnetic field and current instability analyses presented in the previous two parts of the thesis series.

This paper by Handel, Iacomi, and Naumescu presents a cylindrically symmetric solution to plasma equations in intrinsic semiconductors. The work derives mathematical solutions for plasma behavior in semiconductor materials with cylindrical symmetry, contributing to the understanding of charge carrier dynamics and plasma equilibria in semiconductor systems without the presence of external doping.

This paper examines recoilless spin-flip processes in the magnetic scattering of cold neutrons. Handel develops theoretical predictions for neutron scattering phenomena where the spin orientation changes without momentum transfer (recoilless), analogous to the Mössbauer effect but applied to neutron magnetic scattering, with implications for neutron optics and the study of magnetic materials using cold neutron beams.

This paper by Handel and Nobel laureate Charles Kittel, published in the Proceedings of the National Academy of Sciences, investigates the interplay between van der Waals interactions and exciton condensation in semiconductor systems. The work explores how long-range van der Waals forces influence the collective behavior of excitons (bound electron-hole pairs), contributing to understanding of quantum many-body effects and potential Bose-Einstein condensation of excitons in solid-state systems.

This paper by Handel presents the quantum approach to 1/f noise, published in Physical Review A in 1980. This landmark paper establishes rigorous quantum mechanical foundations for understanding 1/f noise as a fundamental quantum effect arising from infrared divergences in bremsstrahlung processes and radiative corrections to scattering, providing theoretical framework that explains the universal 1/f spectrum observed across diverse physical systems as a consequence of quantum electrodynamics, representing a major advance in fundamental noise theory with broad technological implications.

No PDF file available for this paper entry. Based on the IntegralList, this appears to be paper #198 regarding quantum 1/f proximity effect in nanotechnology, presented at the 8th Foresight Conference on Molecular Nanotechnology in 2000, discussing quantum noise phenomena in nanoscale structures where proximity between components affects 1/f noise characteristics.

This paper discusses expected 1/f noise reduction through moderate irradiation in high-mobility junctionless nanodevices and examines quantum 1/f noise in Resonant Tunneling Diodes (RTDs). The work explores how controlled radiation exposure can modify defect structures to reduce low-frequency noise in nanoscale devices, and analyzes the fundamental quantum mechanical sources of 1/f noise in RTD structures used for high-frequency oscillators and quantum computing applications.

No PDF file available for this paper entry. Based on the IntegralList, this appears to be paper #205 on new insights regarding fundamental 1/f noise theory and applications, presented as an invited paper at the 16th International Conference on Noise in Physical Systems and 1/f Fluctuations in Gainesville, Florida in 2001, discussing advances in understanding the quantum origins and technological implications of 1/f noise.

This paper by Sia, Chua, Hartnagel, and Handel examines quantum 1/f noise in epitaxial lateral overgrown (ELO) GaN with particular focus on the piezoelectric effect. The research investigates how piezoelectric coupling in GaN crystal structures contributes to low-frequency 1/f noise, with implications for the design and optimization of GaN-based devices such as high-electron-mobility transistors (HEMTs) and optoelectronic components where noise performance is critical.

This invited SPIE paper discusses quantum 1/f optimization of quantum sensing in spintronic, electro-optic and nano-devices. Handel presents strategies for minimizing fundamental 1/f noise in advanced sensing technologies by understanding and controlling the quantum mechanical origins of this noise, with applications to spin-based electronics, optical sensing systems, and nanoscale measurement devices where ultimate sensitivity is required for detecting chemical, biological, or physical signals.

This SPIE conference paper explores the nature of fundamental 1/f noise in quantum sensing technology, with particular emphasis on negative entropy and the uncertainty principle. Handel analyzes how quantum mechanical constraints, including Heisenberg's uncertainty relations, fundamentally limit noise performance in quantum sensing applications, and discusses the thermodynamic aspects of 1/f noise including non-equilibrium entropy production in high-precision measurement systems.

This paper presents proof of cloud instability with respect to the formation of several horizontal space charge layers. Handel demonstrates theoretically that atmospheric clouds are inherently unstable and will spontaneously develop multiple horizontal layers of separated electrical charge, contributing to the polarization catastrophe mechanism of thundercloud electrification and providing a physical basis for understanding the vertical electrical structure observed in cumulo-nimbus clouds and its role in lightning generation.

This paper by Handel, Grace, and Leitner examines ball lightning discharge phenomena fed by an atmospheric maser. The maser-caviton theory proposes that ball lightning is sustained by coherent microwave amplification (maser action) in the atmosphere, creating a stable plasma sphere or caviton that can persist for extended periods, explaining the observed luminosity, motion patterns, and energy content of ball lightning through a self-sustaining electromagnetic resonance mechanism coupled to atmospheric plasma dynamics.

This paper by Handel, Hartnagel, Sia, and Wolf investigates the connection between coherent and conventional piezoelectric quantum 1/f noise and examines the role of subharmonics in these phenomena. The research explores how piezoelectric coupling in crystalline materials generates two distinct regimes of quantum 1/f noise (coherent and conventional), and demonstrates that subharmonic frequency components play a crucial role in bridging these regimes, with important implications for optimizing noise performance in piezoelectric sensors, resonators, and acoustic devices.

This paper by Handel and Witt presents a physical derivation of the coherent gravidynamic quantum 1/f effect. The work develops a theoretical framework showing that gravitational interactions at the quantum level contribute to 1/f noise through a coherent mechanism, potentially providing a fundamental connection between gravitational physics and low-frequency noise phenomena in physical systems, with implications for gravitational wave detection and tests of quantum gravity theories.

This paper by Handel, Lin, Mishra, and Shen examines quantum 1/f noise in GaN/AlGaN High Electron Mobility Field Effect Transistors (HEFTs) and other nanodevices. The research analyzes the fundamental quantum mechanical sources of low-frequency 1/f noise in gallium nitride based heterostructures, which are critical for high-power, high-frequency electronics and RF applications, providing theoretical predictions and guidance for optimizing device design to minimize noise and improve performance in communications, radar, and power electronics systems.

This paper presents a quantum theory of 1/f noise in irradiated semiconductor samples and devices. Handel investigates how radiation-induced defects and modifications to the crystal lattice structure affect the quantum mechanical mechanisms generating 1/f noise, with implications for understanding radiation hardening effects, designing radiation-tolerant electronics for space applications, and potentially using controlled irradiation to engineer improved noise characteristics in semiconductor devices and sensors.

This paper by Handel and Tetzlaff analyzes thermal fluctuations in the speed of linear biological motors. The work applies quantum 1/f noise theory and thermal fluctuation analysis to molecular motors such as kinesin and myosin that transport cargo along cytoskeletal filaments, examining how fundamental noise sources limit the speed regulation and efficiency of these nanoscale biological machines, with implications for understanding cellular transport mechanisms and designing biomimetic nanomechanical systems.

This paper by Handel and Lin presents 1/f noise measurement and theory in GaN HEFTs (High Electron Mobility Field Effect Transistors) and extends to other devices and systems. The research combines experimental noise measurements with quantum theoretical predictions for gallium nitride based transistors, providing a comprehensive analysis of low-frequency noise sources and their impact on device performance, reliability, and system-level applications in wireless communications, power amplifiers, and high-frequency circuits.

No PDF file available for this paper entry. Based on the IntegralList, this appears to be paper #227 which is the Final Technical Report submitted to the Air Force Office of Scientific Research on the investigation of quantum 1/f effect and other fluctuations in radiation-hardening of multiple-satellite systems, documenting research findings on noise phenomena relevant to space-based electronics and radiation tolerance (Grant No. F49620-00-1-0306, submitted February 2003).

No PDF file available for this paper entry. Based on the IntegralList, this appears to be paper #228 by Handel, Hu, George, and Nánai on the fractal dimension of quantum 1/f noise samples, published in the Journal of Chaos, Solitons & Fractals in 2004, investigating the fractal geometric properties and scaling characteristics of quantum 1/f noise time series and their implications for understanding the complex structure of fundamental noise processes.

This paper by Handel and George examines the quantum 1/f noise modification of the characteristic functional of thermal noise. The work analyzes how quantum mechanical 1/f noise effects modify the statistical properties of thermal (Johnson-Nyquist) noise, developing a comprehensive theoretical framework using characteristic functionals to describe the combined effects of thermal fluctuations and quantum 1/f noise in resistive elements and electronic components at finite temperatures.

This IEEE Transactions paper by Handel, Tournier, and Henning investigates the quantum 1/f effect in resonant biochemical piezoelectric and MEMS (Micro-Electro-Mechanical Systems) sensors. The research analyzes fundamental quantum noise limits in miniaturized resonant sensors used for detecting biological molecules and chemical species, showing how piezoelectric coupling and quantum 1/f noise establish ultimate sensitivity bounds for mass detection, providing design guidelines for optimizing biochemical MEMS sensors for medical diagnostics, environmental monitoring, and biosecurity applications.

This WOCSDICE 2004 paper by Handel, Hartnagel, Sia, Mishra, and York examines GaN HEMT geometry and piezoelectric quantum 1/f noise. The research investigates how the physical geometry and structural design of gallium nitride High Electron Mobility Transistors affect piezoelectric-induced quantum 1/f noise, providing insights for optimizing device layout, channel dimensions, and heterostructure configurations to minimize noise while maintaining high-frequency performance in GaN-based RF and power electronics applications.

This WOCSDICE 2004 paper by Handel and Henning addresses 1/f frequency fluctuations and phase noise in MEMS (Micro-Electro-Mechanical Systems) resonators. The work analyzes the quantum and classical sources of frequency instability and phase noise in miniaturized mechanical resonators used as frequency references and timing elements, examining how fundamental 1/f noise processes limit the stability and accuracy of MEMS oscillators, with implications for timing applications, inertial sensors, and RF communication systems.

This paper by Handel, Carlson, Grace, and Leitner examines the motion of ball lightning discharge fed by an atmospheric maser, presented at the 8th International Symposium on Ball Lightning in Taiwan. The research develops the maser-caviton theory to explain observed ball lightning trajectories and motion patterns, proposing that electromagnetic phase gradients and momentum transfer from the atmospheric maser drive ball lightning movement, accounting for its ability to pass through windows, move against wind, and exhibit unusual hovering or erratic flight behavior.

This paper by Handel, Carlson, Grace, and Leitner examines electrostatic ponderomotive forces as the cause of explosive ball lightning damages. The research proposes that intense electrostatic forces generated by charge separation in the ball lightning plasma structure can produce powerful mechanical effects on nearby objects, explaining observed cases where ball lightning causes explosive damage to buildings, equipment, or materials through electromagnetic pressure and sudden energy release rather than thermal effects alone.

This invited paper by George and Handel presents a quantum 1/f effect formulation based on quantum information theory, presented at ICSSUR Besancon 2005. The work bridges concepts from quantum information science with fundamental noise theory, showing how information-theoretic principles such as entropy, entanglement, and quantum measurement can provide new insights into the origins and characteristics of 1/f noise, with implications for quantum computing, quantum communications, and fundamental physics.

This paper by Tournier and Handel examines quantum 1/f noise and quantum 1/f phase noise in relation to the uncertainty relations, presented at ICSSUR 2005. The research demonstrates fundamental connections between Heisenberg's uncertainty principle and the existence of 1/f noise in physical systems, showing that quantum mechanical constraints on simultaneous measurements of conjugate variables establish lower bounds on phase noise and frequency fluctuations in oscillators, sensors, and quantum devices.

This paper by Handel, Tournier, Hartnagel, Mishra, and York investigates 1/f noise in GaN/AlGaN HFET based oscillators. The research analyzes how low-frequency 1/f noise in gallium nitride transistors upconverts to phase noise in oscillator circuits, affecting the spectral purity and stability of RF signal sources built with GaN technology, providing design guidelines for minimizing phase noise in GaN-based voltage-controlled oscillators, frequency synthesizers, and local oscillators for radar and communications systems.

This paper by Handel, Tournier, Hartnagel, Mishra, and York examines quantum 1/f phase noise in GaN/AlGaN HFET based oscillators. The work provides a quantum mechanical analysis of phase noise generation in gallium nitride transistor-based oscillators, explaining how fundamental quantum 1/f noise processes in the semiconductor heterostructure translate into close-in phase noise sidebands around the carrier frequency, with implications for synthesizer jitter, receiver sensitivity, and system performance in wireless infrastructure and military electronics.

This invited paper by Handel, presented at the 2005 Joint Assembly in New Orleans, demonstrates the general instability of clouds with respect to formation of horizontal space charge layers. The research shows that atmospheric clouds are fundamentally unstable and will spontaneously develop stratified regions of separated electrical charge, providing the physical mechanism underlying thunderstorm electrification through the polarization catastrophe process and explaining the layered electrical structure observed in storm clouds preceding lightning discharges.

This invited paper by Handel and Carlson, presented at the 2005 AGU Joint Assembly, derives the motion of ball lightning in the maser-soliton theory. The research develops mathematical equations describing ball lightning trajectories based on the coupling between atmospheric maser radiation and plasma soliton dynamics, explaining observed motion patterns including hovering, controlled movement, passing through narrow openings, and trajectory changes in response to electromagnetic field gradients and atmospheric conditions.

This highly-cited invited paper by Handel and Tournier, published in Proceedings of the IEEE, addresses nanoscale engineering for reducing phase noise in electronic devices. The comprehensive review examines design principles and fabrication techniques for minimizing phase noise in nanoscale transistors, oscillators, and integrated circuits through quantum 1/f noise optimization, discussing material selection, device geometry, doping profiles, and circuit architectures that exploit quantum effects to achieve superior frequency stability in communications, timing, and sensing applications.

This paper by George and Handel, published in International Journal of Modern Physics B, develops the quantum 1/f effect based on quantum information theory. The work establishes rigorous connections between information-theoretic quantities such as von Neumann entropy, mutual information, and quantum entanglement, and the fundamental origins of 1/f noise in physical systems, providing a new theoretical framework that unifies quantum measurement theory, decoherence processes, and low-frequency noise phenomena in quantum and classical devices.

This paper by Tournier and Handel, published in International Journal of Modern Physics B, explores quantum 1/f noise and quantum 1/f phase noise in relation to the uncertainty relations. The research demonstrates that the fundamental uncertainty relations of quantum mechanics impose fundamental limits on achievable noise performance in electronic devices and sensors, showing that phase noise and frequency instability have irreducible quantum mechanical contributions that cannot be eliminated through improved engineering but establish ultimate bounds on measurement precision.

This paper by Handel and Tournier, presented at the 2005 Joint IEEE International Frequency Control Symposium, examines quantum 1/f and classical phase noise in resonant bio-chemical MEMS sensors. The work analyzes both fundamental quantum noise sources and classical technical noise in microelectromechanical resonant sensors designed to detect biological molecules and chemical agents through mass loading or surface binding effects, providing comprehensive noise models for optimizing detection sensitivity, selectivity, and limit-of-detection in biomedical and environmental monitoring applications.

This paper by Handel, Carlson, and Leitner examines maser caviton ball lightning interaction spiking with cold emission, presented at the 9th International Symposium on Ball Lightning in Eindhoven. The research analyzes rapid energy fluctuations (spiking) in ball lightning resulting from nonlinear interactions between the atmospheric maser and plasma caviton, and explains observed cold electron emission from ball lightning surfaces through field emission mechanisms driven by intense electromagnetic fields at the plasma boundary.

This paper by Handel and Carlson examines the rise time of maser-caviton ball lightning energy spikes, presented at the 9th International Symposium on Ball Lightning. The research calculates the temporal characteristics of energy pulses generated during ball lightning spiking events, showing that the coupling dynamics between atmospheric maser oscillations and plasma caviton resonances produce rapid energy fluctuations with characteristic rise times that match observed electromagnetic pulse signatures associated with ball lightning, explaining the electrical disturbances and equipment damage sometimes reported.

This paper by Handel, Carlson, and Leitner examines phase shifts as the cause of ball lightning motion, presented at the 2nd International Symposium on Unconventional Plasmas. The work proposes that spatial gradients in the electromagnetic phase of the atmospheric maser radiation drive ball lightning movement through momentum transfer and radiation pressure effects, explaining why ball lightning can exhibit controlled motion, hover in place, or move in directions independent of air currents based on the local electromagnetic field configuration.

This paper by Handel examines spontaneous formation of horizontal space charge layers in clouds, presented at the 2nd International Symposium on Unconventional Plasmas. The research demonstrates through theoretical analysis that cloud structures containing ice crystals and water droplets are inherently unstable and will spontaneously develop multiple horizontal regions of charge separation through the polarization catastrophe mechanism, providing the foundational physics for understanding thunderstorm electrification without requiring pre-existing charge separation or external electric fields.

This paper by Carlson and Handel discusses observation of maser emission in planetary atmospheric plasma, presented at the 2nd International Symposium on Unconventional Plasmas. The work presents evidence for naturally-occurring maser (microwave amplification by stimulated emission of radiation) activity in planetary atmospheres including Earth, potentially explaining various electromagnetic phenomena such as radio emissions from Jupiter and Saturn, atmospheric glow discharges, and providing observational support for the maser-caviton theory of ball lightning.

This paper by Handel and Hall examines quantum 1/f noise in THz detectors and generators, submitted to International Journal of High Speed Electronics and Systems in 2006. The research analyzes fundamental noise limitations in terahertz frequency devices including quantum cascade lasers, Schottky diode mixers, and bolometric detectors, showing how quantum 1/f noise affects sensitivity, noise equivalent power, and frequency stability in the technologically important terahertz gap between microwave and infrared regions for imaging, spectroscopy, and communications applications.

This paper by Handel, Hall, and Tournier discusses noise in THz detectors and generators, presented at the 2006 SPIE Defense and Security Symposium. The work provides comprehensive analysis of noise sources including quantum 1/f noise, thermal noise, generation-recombination noise, and technical noise in terahertz devices used for security screening, standoff chemical detection, biomedical imaging, and wireless communications, offering design guidelines for achieving optimal noise performance in emerging terahertz technologies for defense and commercial applications.

This paper by Handel and Hall examines quantum 1/f noise in spectral sensors, detectors, mixers and oscillators, presented at the International Symposium on Spectral Sensing Research in Bar Harbor. The research analyzes how fundamental quantum 1/f noise affects performance across multiple device types used in spectroscopic systems, including infrared detectors for chemical identification, frequency mixers for heterodyne detection, and local oscillators providing frequency references, with implications for standoff detection, environmental monitoring, and analytical instrumentation requiring high sensitivity and spectral resolution.

This invited SPIE paper by Handel, Hall, and Morkoç examines quantum 1/f noise in GaN FETs, MODFETs, and their oscillators' phase noise. The research provides comprehensive analysis of low-frequency noise in gallium nitride field-effect transistors and modulation-doped FETs, and demonstrates how this baseband noise upconverts to phase noise sidebands in oscillator applications, offering theoretical predictions and design strategies for minimizing phase noise in GaN-based RF sources for radar, satellite communications, and high-power microwave systems.

This SPIE paper by Hall and Handel investigates 1/f noise in the dark current of GaN Quantum Well Infrared Photodetectors (QWIPs). The research analyzes low-frequency fluctuations in the leakage current of gallium nitride based infrared detectors, which limits detection sensitivity particularly at low frequencies relevant to imaging and tracking applications, showing how quantum 1/f noise contributions in the dark current establish fundamental noise floors for GaN QWIP focal plane arrays in thermal imaging and night vision systems.

This paper by Handel, Li, and George examines quantum 1/f fluctuations in wind flow rate, submitted to Chaos, Solitons and Fractals. The work applies quantum 1/f noise theory beyond traditional electronic systems to macroscopic fluid dynamics, investigating whether fundamental quantum fluctuations contribute to observed 1/f spectral characteristics in atmospheric turbulence and wind velocity measurements, with implications for understanding scaling laws in turbulent flows, wind energy forecasting, and the connections between quantum mechanics and classical fluid dynamics.

This paper by Handel, Carlson, and Leitner discusses ball lightning with spiking and cold emission in the maser-caviton interaction, presented at the 2007 American Geophysical Union General Assembly in Acapulco. The research combines analysis of temporal energy fluctuations (spiking behavior) with electron field emission processes in the maser-caviton ball lightning model, explaining observed luminosity variations, electromagnetic pulse generation, and surface discharge phenomena associated with ball lightning encounters with conducting objects or ground.

This invited talk by Handel, presented at the 2007 AGU General Assembly, examines giant dipole moments of submicron ice crystallites nucleated on dust particles as the cause of polarization catastrophe and sprites. The research proposes that ice crystals forming on aerosol particles in high-altitude clouds develop enormous electric dipole moments that drive the polarization catastrophe mechanism of thunderstorm electrification and also explains the generation of mesospheric sprites (transient luminous events above thunderstorms) through sudden electromagnetic pulses from lightning discharges.

This paper by Handel, presented at the 2007 AGU General Assembly, examines polarization catastrophe contributing to rotation and tornadic motion in cumulo-nimbus clouds. The research proposes that electrical charge separation through the polarization catastrophe mechanism generates large-scale electromagnetic forces and torques within thunderstorms that contribute to cloud rotation, mesocyclone development, and tornado formation, suggesting that electrical effects play a more significant role in severe weather dynamics than previously recognized in conventional meteorological theory.

This paper by Sikula, Handel, and Truong examines quantum 1/f noise in bio-chemical resonant ZnO sensors, presented at the 19th International Conference on Noise and Fluctuations in Tokyo. The research analyzes fundamental noise limitations in zinc oxide based resonant sensors designed for detecting biological molecules and chemical species through frequency shifts caused by mass loading or surface binding, showing how quantum 1/f frequency fluctuations establish ultimate sensitivity limits for ZnO nanowire resonators, thin-film bulk acoustic resonators, and surface acoustic wave devices in biosensing applications.

This invited paper by Handel, Truong, George, and Morkoç presents quantum 1/f noise as a new aspect of quantum physics in high-tech devices, sensors, nanostructures and systems, presented at ICNF 2007 in Tokyo. The comprehensive review examines how quantum 1/f noise represents a fundamental quantum mechanical phenomenon with broad technological implications across diverse applications including semiconductor devices, sensors, nanoscale structures, and complex systems, arguing for recognition of quantum 1/f noise as an essential consideration in modern quantum technology development.

This paper by Handel, Morkoç, and Truong discusses use of quantum 1/f noise formulas in the reliability characterization of nitride-based heterostructures, published in SPIE Proceedings on Gallium Nitride Materials and Devices. The research demonstrates how analyzing 1/f noise measurements using quantum noise theory provides insights into defect dynamics, degradation mechanisms, and reliability physics in GaN/AlGaN heterostructure devices, offering non-destructive testing methods for assessing long-term stability and predicting failure modes in high-power electronics and RF amplifiers.

This invited SPIE paper by Handel, Morkoç, Sia, and Truong examines piezoelectric quantum 1/f noise in nitride-based heterostructures. The research provides detailed analysis of how piezoelectric coupling in gallium nitride and aluminum gallium nitride heterostructures contributes to quantum 1/f noise through strain-induced polarization fields and phonon interactions, with implications for understanding noise mechanisms in GaN HEMTs, optimizing heterostructure design to minimize noise, and improving performance of GaN-based power amplifiers and RF devices.

This SPIE paper by Handel and Truong investigates 1/f noise in nitride-based spintronic devices. The research examines low-frequency noise in gallium nitride based spin-electronic devices that exploit both charge and spin degrees of freedom for magnetic sensing, data storage, and logic applications, analyzing how quantum 1/f noise affects spin injection efficiency, magnetoresistance fluctuations, and read/write performance in GaN-based spin valves, magnetic tunnel junctions, and spin field-effect transistors relevant to next-generation non-volatile memory and quantum information processing.

This SPIE paper by Fan, Leach, Wu, Xiao, Gu, Morkoç, and Handel compares various gate dielectrics in the performance of AlGaN/GaN HFETs. The research evaluates different high-k dielectric materials for metal-insulator-semiconductor HFETs, comparing their effects on threshold voltage, transconductance, gate leakage, breakdown voltage, and low-frequency noise, with the goal of optimizing gate stack design for improved power density, efficiency, and reliability in GaN-based power electronics and RF amplifiers.

This SPIE Defense & Security paper by Handel examines quantum 1/f noise in all-epitaxial metal-semiconductor diodes. The research analyzes low-frequency noise in Schottky barrier diodes fabricated entirely by epitaxial growth techniques without requiring external metal deposition, investigating how quantum 1/f noise mechanisms differ in these structures compared to conventional diodes, with applications to millimeter-wave mixers, detectors, and frequency multipliers where low noise performance is critical for radar and communications systems.

This SPIE Defense & Security paper by Handel investigates 1/f noise and phase noise in AlGaSb/InAs/AlGaSb double-barrier resonant tunneling diode (RTD) oscillators. The research examines low-frequency noise sources in antimonide-based RTD structures and how this noise converts to phase noise in RTD-based terahertz oscillators, analyzing quantum 1/f contributions and providing design strategies for minimizing phase noise in compact solid-state terahertz sources for imaging, spectroscopy, and high-speed wireless communications applications.

This IEEE Sensors paper by Truong, Handel, and Fraundorf examines quantum 1/f biochemical detection limits in THz signatures revealed by scanning tunneling microscopy currents. The research investigates using scanning tunneling microscope (STM) tunnel currents to detect terahertz vibrational signatures of biological molecules, analyzing how quantum 1/f noise in the tunneling current establishes fundamental detection limits for identifying biomolecules through their characteristic THz absorption fingerprints, with applications to single-molecule detection, protein identification, and nanoscale biosensing.

This paper by Handel, Carlson, and Leitner, published in International Journal of Unconventional Electromagnetics and Plasmas, focuses on understanding the motion of ball lightning. The work synthesizes theoretical developments in the maser-caviton model to explain observed ball lightning trajectories, including translational motion, hovering behavior, passing through barriers, and interaction with electromagnetic fields, providing a unified framework for understanding ball lightning kinematics based on electromagnetic momentum transfer and plasma soliton dynamics.

This paper by Handel and George examines 1/f noise inside a Faraday cage, presented at the 20th International Conference on Noise and Fluctuations. The research investigates whether electromagnetic shielding affects quantum 1/f noise measurements, showing that while Faraday cages block external electromagnetic interference, they cannot eliminate fundamental quantum 1/f noise originating from intrinsic quantum mechanical processes within shielded devices, with implications for understanding the distinction between technical and fundamental noise sources in precision measurements.

This paper by Handel discusses use of ball lightning for THz stand-off detection of bio-chemical agents, presented at the International Symposium on Spectral Sensing Research at Stevens Institute of Technology. The research proposes that controlled or naturally-occurring ball lightning could serve as a coherent terahertz radiation source for remote detection of chemical and biological agents through their characteristic THz absorption signatures, exploring the potential application of atmospheric plasma phenomena to homeland security and defense sensing applications.

This paper by Handel examines ball lightning with spiking and cold emission in the maser-caviton interaction, presented at the International Symposium on Spectral Sensing Research. The work analyzes rapid energy fluctuations (spiking) and electron field emission from ball lightning in the context of the maser-caviton model, discussing how these phenomena produce electromagnetic signatures that could potentially be detected and characterized using spectroscopic techniques for understanding and predicting ball lightning behavior.

This paper by Handel discusses emulation of ball lightning for THz stand-off detection of bio-chemical agents, presented at the International Symposium on Spectral Sensing Research. The research explores laboratory generation of ball lightning-like plasma structures to create controllable terahertz radiation sources for standoff chemical and biological detection, investigating plasma discharge conditions, maser cavity configurations, and emission characteristics needed to replicate ball lightning's coherent electromagnetic properties for practical sensing applications.

This SPIE paper by Handel and Morkoç examines piezoelectric quantum 1/f noise in AlGaN HFETs and reliability. The research investigates how piezoelectric-induced quantum 1/f noise correlates with reliability and degradation in aluminum gallium nitride high electron mobility transistors, showing that low-frequency noise measurements can serve as early indicators of defect formation, trap generation, and impending failure, providing non-destructive diagnostic tools for assessing device quality and predicting long-term reliability in GaN-based power amplifiers and switches.

This SPIE paper by Handel and Morkoç examines piezoelectric quantum 1/f noise in AlGaN HFETs and reliability. The research investigates the relationship between piezoelectric-induced quantum 1/f noise and device reliability in aluminum gallium nitride heterostructure field-effect transistors, demonstrating that noise analysis provides insights into degradation mechanisms, defect dynamics, and failure modes, enabling reliability prediction and quality assessment for GaN-based RF and power electronic devices in demanding military and commercial applications.

This paper by Handel and Truong examines noise limitations of FET-based biochemical sensors, presented at ICNF 2009. The research analyzes how various noise sources including quantum 1/f noise, thermal noise, and flicker noise in field-effect transistor based biosensors limit detection sensitivity for biomolecules, providing theoretical framework for predicting minimum detectable concentrations and designing optimized FET sensor geometries and surface functionalization strategies for label-free electronic detection of proteins, DNA, and small molecules in medical diagnostics.

This paper by Truong and Handel examines 1/f performance limits of scanning tunneling microscopes, presented at ICNF 2009. The research analyzes how quantum 1/f noise in the tunneling current between STM tip and sample establishes fundamental limits on imaging resolution, spectroscopic sensitivity, and minimum detectable signal for atomic-scale measurements, with implications for understanding achievable performance in scanning probe microscopy, single-atom manipulation, and nanoscale characterization of electronic and structural properties.

This paper by Handel and George examines 1/f noise inside a Faraday cage, presented at ICNF 2009. The research investigates whether electromagnetic shielding eliminates or reduces quantum 1/f noise, demonstrating that Faraday cage shielding blocks external electromagnetic interference but cannot suppress fundamental quantum 1/f noise arising from intrinsic quantum processes in materials and devices, clarifying the distinction between technical environmental noise and irreducible quantum mechanical noise contributions in shielded measurement systems.

This paper by Pavelka, Tanuma, Tacano, Šikula, and Handel examines low-frequency noise characteristics of InGaAs/InAlAs heterostructures, presented at ICNF 2009. The research investigates 1/f noise in indium-based III-V semiconductor heterostructures used for high-speed electronics and infrared detectors, analyzing contributions from various noise mechanisms including quantum 1/f effects, carrier number fluctuations, and mobility fluctuations, with implications for optimizing material quality and device design for low-noise high-electron-mobility transistors and photodetectors.

This SPIE-PW paper by Handel and Sherif presents analytical calculation of the quantum 1/f coherence parameter for HFETs. The research develops mathematical formulas for quantifying the coherence length and coherence parameter that characterize the transition between coherent and conventional quantum 1/f noise regimes in heterostructure field-effect transistors, providing theoretical tools for predicting noise behavior as a function of device geometry, temperature, and bias conditions in advanced semiconductor devices.

This SPIE-PW paper by Truong and Handel examines quantum 1/f noise theory and experiment in Quantum Well Infrared Photodetectors (QWIPs). The research combines theoretical predictions of quantum 1/f noise in intersubband photodetectors with experimental measurements, validating quantum noise models and demonstrating how fundamental 1/f noise limits detection sensitivity in QWIP focal plane arrays used for thermal imaging, analyzing the dependence of noise on quantum well design, doping, and operating temperature.

This SPIE-PW paper by Handel, Sherif, Kayis, Leach, Zhu, and Morkoç demonstrates that 1/f noise serves as a window to HFET stability. The research shows that low-frequency noise measurements provide diagnostic information about defect states, trap dynamics, and degradation processes in heterostructure field-effect transistors, establishing correlations between noise parameters and device reliability, enabling predictive testing and quality control for ensuring long-term stable operation of GaN and other compound semiconductor transistors.

This WOCSDICE 2010 paper by Handel, Sherif, Kayis, Leach, and Morkoç presents an HFET stability criterion. The research develops quantitative criteria based on 1/f noise measurements for assessing and predicting heterostructure field-effect transistor stability and reliability, showing that specific noise parameter thresholds correlate with stable versus degrading device behavior, providing manufacturers and users with practical diagnostic tools for screening devices and ensuring reliable performance in critical RF and power electronics applications.

This WOCSDICE 2010 paper by Handel, Truong, Nasiri Avanaki, Sherif, and Morkoç examines quantum 1/f noise in FET-based biochemical sensors. The research analyzes fundamental quantum noise limitations in field-effect transistor sensors for detecting biomolecules, investigating how device geometry, surface functionalization, and operating conditions affect noise performance and detection limits, providing design guidelines for optimizing sensitivity in label-free electronic biosensors for medical diagnostics, drug discovery, and environmental monitoring applications.

This WOCSDICE 2010 paper by Sikula, Handel, and Truong examines fundamental noise in resonant ZnO sensors. The research investigates quantum 1/f noise and other fundamental noise sources in zinc oxide based resonant sensors including bulk acoustic wave resonators, surface acoustic wave devices, and nanowire resonators used for mass detection and chemical sensing, analyzing how material properties, crystal quality, and piezoelectric coupling affect noise performance and ultimate detection sensitivity for biosensing and gas detection applications.

This EXMATEC 2010 paper by Handel presents low frequency noise theory for metal-semiconductor diodes. The research develops comprehensive theoretical framework for understanding 1/f noise in Schottky barrier diodes, analyzing contributions from interface states, barrier height fluctuations, and quantum 1/f mechanisms, providing predictions for noise behavior as functions of bias, temperature, and material parameters, with applications to improving diode design for low-noise mixers, detectors, and power rectifiers in RF and power electronics.

This EXMATEC 2010 paper by Morkoç, Kayis, Leach, Zhu, and Handel examines HFET stability and 1/f noise. The research presents comprehensive analysis of relationships between low-frequency noise characteristics and long-term reliability in heterostructure field-effect transistors, showing that noise measurements during accelerated aging tests reveal degradation mechanisms and predict failure modes, enabling development of reliability models and screening procedures for ensuring robust performance of GaN and other compound semiconductor transistors in demanding applications.

This EXMATEC 2010 paper by Handel, Truong, and Nasiri Avanaki examines fundamental 1/f piezoelectric transducer size fluctuations. The research analyzes how quantum 1/f noise manifests as random fluctuations in the physical dimensions and resonant frequency of piezoelectric transducers and resonators, showing that these fundamental size fluctuations establish lower bounds on frequency stability in quartz oscillators, MEMS resonators, and acoustic sensors, with implications for timing applications and precision frequency control.

This ISSSR 2010 paper by Handel presents quantum 1/f noise calculations for all-epitaxial metal-semiconductor diodes. The research develops detailed theoretical models and numerical calculations for predicting 1/f noise in Schottky diodes fabricated entirely by epitaxial semiconductor growth techniques, analyzing how quantum noise mechanisms differ from conventional metal-deposited diodes, with applications to optimizing low-noise millimeter-wave and terahertz mixers, detectors, and frequency multipliers for spectroscopic sensing and imaging.

This ISSSR 2010 paper by Handel and George examines 1/f noise inside a Faraday cage. The research investigates whether electromagnetic shielding affects fundamental quantum 1/f noise, demonstrating that while Faraday cages effectively block external electromagnetic interference, they cannot eliminate intrinsic quantum 1/f noise originating from fundamental quantum mechanical processes, clarifying important distinctions between environmental technical noise and irreducible quantum noise for designing ultra-low-noise measurement systems and understanding fundamental noise limits.

This ISSSR 2010 paper by Handel, Henning, Truong, and Nasiri Avanaki examines quantum 1/f noise in FET-based biochemical sensors. The research analyzes fundamental noise limitations in field-effect transistor biosensors, investigating how quantum 1/f noise, thermal noise, and shot noise establish detection limits for biomolecular sensing, providing theoretical framework and design strategies for optimizing sensitivity in electronic biosensors for protein detection, DNA sequencing, and real-time molecular diagnostics applications.

This ISSSR 2010 paper by Handel, Truong, and Nasiri Avanaki examines quantum 1/f piezoelectric transducer size fluctuations. The research investigates fundamental quantum mechanical fluctuations in the physical dimensions and vibrational modes of piezoelectric resonators, showing that these size fluctuations produce 1/f frequency noise that limits stability in quartz crystal oscillators, MEMS timing devices, and resonant sensors, providing insights for designing ultra-stable frequency references and precision sensors.

This ISSSR 2010 paper by Truong and Handel examines quantum 1/f noise theory and experiment in Quantum Well Infrared Photodetectors (QWIPs). The research presents comprehensive comparison between theoretical predictions and experimental measurements of 1/f noise in intersubband photodetectors, validating quantum noise models and analyzing how quantum well design parameters, doping concentration, and temperature affect noise characteristics and detection sensitivity in QWIP focal plane arrays for thermal imaging applications.

This IEEE Electron Device Letters paper by Kayis, Leach, Zhu, Wu, Li, Özgür, Morkoç, Yang, Misra, and Handel examines low-frequency noise measurements of AlGaN/GaN MOS HFETs with HfAlO gate dielectric. The research investigates how hafnium aluminum oxide high-k dielectric affects 1/f noise in metal-oxide-semiconductor heterostructure field-effect transistors, comparing noise performance with conventional Schottky gate devices and analyzing the role of interface traps and dielectric quality in determining noise characteristics relevant to low-noise amplifier applications.

This SPIE-PW paper by Handel and Morkoç examines new factors affecting HFET stability, 1/f noise and reliability. The research identifies previously unrecognized physical mechanisms that influence long-term stability and noise performance in heterostructure field-effect transistors, including piezoelectric effects, hot carrier degradation, and trap generation dynamics, providing comprehensive framework for understanding reliability physics and developing improved device designs and screening procedures for ensuring stable operation in RF power amplifiers and switches.

This SPIE-PW paper by Handel and Morkoç examines 1/f noise in Schottky diodes. The research analyzes low-frequency noise mechanisms in metal-semiconductor Schottky barrier diodes, investigating contributions from barrier height fluctuations, interface states, and quantum 1/f effects, providing theoretical models and experimental correlations for predicting noise performance as functions of metal choice, semiconductor material, interface preparation, and operating conditions, with applications to low-noise mixer and detector design.

This ICNF 2011 paper by Sedlak, Sikula, Majzner, Vrnata, Vyslouzil, Fitl, Kopecky, and Handel examines noise in quartz crystal microbalance sensors. The research investigates various noise sources including adsorption-desorption noise, thermal noise, and 1/f noise in quartz crystal microbalance (QCM) devices used for mass sensing applications, analyzing how surface molecular binding events produce noise and how fundamental quantum 1/f noise limits detection sensitivity for chemical sensing, biosensing, and thin film deposition monitoring.

This follow-up paper by Sedlak, Sikula, Majzner, Vrnata, Fitl, Kopecky, Vyslouzil, and Handel, published in Sensors and Actuators B Chemical, examines adsorption-desorption noise in QCM gas sensors. The research focuses specifically on noise generated by random molecular binding and unbinding events at the quartz crystal microbalance surface during gas detection, analyzing how these stochastic adsorption-desorption processes produce low-frequency noise that limits detection sensitivity and analyzing strategies for minimizing this noise through surface chemistry optimization and signal processing.

This Applied Physics Letters paper by Hora and Handel examines the α-Dirac effect with lasers and non-resonant interaction for quantum modulation of electron beams (Schwarz-Hora effect). The research investigates quantum mechanical effects when high-intensity laser fields interact with electron beams in non-resonant conditions, producing modulation of electron energies and trajectories through relativistic quantum effects, with applications to advanced electron microscopy, particle acceleration, and fundamental tests of quantum electrodynamics.

This ICNF 2013 paper by Handel examines decoherence and conventional quantum 1/f noise. The research investigates the role of quantum decoherence processes in generating conventional (non-coherent) quantum 1/f noise, showing that loss of quantum phase coherence through environmental interactions and measurement-induced collapse produces the characteristic 1/f spectrum observed in physical systems, providing a fundamental link between quantum measurement theory, open quantum systems, and the ubiquitous 1/f noise phenomenon.

This ICNF 2013 paper by Handel and Nasiri Avanaki examines dependence of 1/f noise on the distance between wires, demonstrating the quantum 1/f proximity effect. The research shows that quantum 1/f noise in parallel conductors depends on their separation distance through electromagnetic coupling and quantum entanglement effects, with practical implications for integrated circuit design, crosstalk analysis, and understanding fundamental noise limits in nanoscale interconnects where quantum proximity effects become significant.

This ICNF 2013 paper by Handel and Tournier examines quantum 1/f noise in spintronics and the future of downscaling. The research analyzes how quantum 1/f noise affects spin-based electronic devices as they scale to nanometer dimensions, investigating noise in spin valves, magnetic tunnel junctions, and spin transistors, and predicting fundamental limits on device miniaturization imposed by quantum noise, with implications for the viability of spintronic memory, logic, and sensing technologies at the ultimate scaling limits.

This ICNF 2013 paper by Handel and Truong presents quantum 1/f noise theory and experiment in Quantum Well Infrared Photodetectors (QWIPs). The research provides comprehensive comparison between theoretical quantum noise predictions and experimental measurements in intersubband photodetectors, validating quantum 1/f noise models and demonstrating how device parameters including quantum well width, barrier height, and doping concentration affect noise characteristics and detection sensitivity in QWIP focal plane arrays for thermal imaging.

This paper by Handel, Hora, Truong, Fraundorf, Tournier, and George examines quantum 1/f noise and phase noise in ferroelectrics, piezoelectrics, MEMS resonators, sensors, and piezoresponse force microscopy, presented at the 2014 Joint IEEE ISAF-IWATMD-PFM Conference. The comprehensive work analyzes fundamental quantum noise across diverse piezoelectric and ferroelectric applications, providing unified theoretical framework for understanding noise in acoustic devices, electromechanical sensors, and nanoscale piezoelectric characterization, with implications for optimizing performance in timing, sensing, and materials characterization applications.

This NUSOD 2014 paper by Handel and Truong presents quantum theory of 1/f noise in quantum well photodetectors. The research develops detailed quantum mechanical theory for predicting low-frequency noise in intersubband photodetectors based on quantum well structures, analyzing contributions from carrier capture, emission, and transport processes, providing design guidelines for minimizing noise and optimizing sensitivity in QWIP devices for infrared imaging, spectroscopy, and optical communications applications.

This ICNF 2017 paper by Handel examines physical 1/f noise and phase noise in piezoelectrics, MEMS resonators and sensors. The research provides comprehensive analysis of fundamental noise sources in piezoelectric devices and microelectromechanical systems used for frequency control and sensing, investigating quantum 1/f noise, thermomechanical noise, and material loss contributions, offering design strategies for minimizing phase noise in MEMS oscillators and improving sensitivity in resonant mass sensors for chemical and biological detection.

This IEEE EFTF/IFC 2017 paper by Handel discusses quantum theory of 1/f frequency fluctuations, demonstrating macroscopic quantum interference present in fundamental 1/f noise measured since 1925. The research presents historical and theoretical analysis showing that quantum mechanical interference effects manifest in 1/f frequency fluctuations observed in early precision oscillator measurements, establishing that quantum 1/f noise has been unknowingly measured for nearly a century and represents a fundamental quantum phenomenon with macroscopic consequences.

This paper by Handel, presented at the International Symposium on Single Photon based Quantum Technologies in Berlin, examines quantum theory of 1/f frequency fluctuations Part 1, focusing on de-coherence as the cause of fundamental 1/f noise. The research establishes that quantum decoherence processes resulting from environmental interactions and measurement-induced wavefunction collapse are the primary physical mechanism generating fundamental 1/f noise in oscillators, sensors, and quantum systems, providing rigorous theoretical foundation connecting decoherence theory with ubiquitous 1/f noise observations.

This paper by Handel, presented at the International Symposium on Single Photon based Quantum Technologies in Berlin, discusses quantum 1/f optimization of resonant and nonresonant sensors using quantum well infrared detectors as an example. The research demonstrates design principles for minimizing quantum 1/f noise in both resonant frequency-shift sensors and nonresonant amplitude-sensing photodetectors, showing how quantum well parameters, doping profiles, and operating conditions can be optimized to approach fundamental quantum noise limits in high-sensitivity detection applications.

This paper by Splett and Handel, presented at the International Symposium on Single Photon based Quantum Technologies in Berlin, examines quantum theory of 1/f frequency fluctuations Part 2, focusing on quantum 1/f optimization of quartz resonators, electronics, MEMS, clocks, piezotransducers, and resonant sensors. The comprehensive work provides practical design strategies for minimizing quantum 1/f frequency noise across diverse applications, offering specific optimization approaches for different device types to achieve ultimate frequency stability in precision timing and sensing systems.

This paper by Handel and Splett examines the humming and motion of ball lightning Part 1, focusing on atmospheric maser spiking, presented at the VI International Conference "Atmosphere, Ionosphere, Safety". The research analyzes acoustic emissions (humming sounds) and rapid energy fluctuations (spiking) in ball lightning as consequences of the atmospheric maser mechanism, showing that periodic maser oscillations and their modulation produce both audible sound and electromagnetic pulses consistent with eyewitness reports of ball lightning behavior.

This paper by Handel and Splett examines the humming and motion of ball lightning Part 2, focusing on discussion and motion, presented at the VI International Conference "Atmosphere, Ionosphere, Safety". The research develops detailed theoretical predictions for ball lightning trajectories and acoustic signatures based on the maser-caviton model, explaining observed hovering, translational motion, and sound production through electromagnetic momentum transfer and acoustic wave generation from oscillating plasma structures.

This paper by Handel and Splett examines the humming and motion of ball lightning Part 3, focusing on experiments on the maser-soliton theory and a new cloud electrification process, presented at the VI International Conference "Atmosphere, Ionosphere, Safety". The research proposes laboratory experiments to test the maser-caviton ball lightning model and connects ball lightning physics to broader atmospheric electrical phenomena, discussing how the polarization catastrophe mechanism of cloud electrification relates to conditions favorable for ball lightning formation.

This ICNF 2019 paper by Handel examines coherent and conventional gravidynamic quantum 1/f effects. The research analyzes quantum 1/f noise originating from gravitational interactions, distinguishing between coherent quantum interference effects and conventional decoherence mechanisms in gravitational quantum noise, with implications for understanding fundamental noise in precision gravitational measurements, gravitational wave detectors, and tests of quantum gravity theories where quantum fluctuations of spacetime may manifest as 1/f noise.

This ICNF 2019 paper by Handel and Splett examines cosmic nonstationarity of the coherent gravidynamic quantum 1/f effect. The research investigates how expansion of the universe and cosmological evolution affect gravidynamic quantum 1/f noise, showing that coherent gravitational quantum noise exhibits time-dependent characteristics reflecting cosmological parameters, potentially providing new observational tests of cosmology and quantum gravity through analysis of long-term frequency stability measurements in precision oscillators and atomic clocks.

This ICNF 2019 paper by Handel presents quantum 1/f noise as a decoherence phenomenon. The research establishes rigorous theoretical connection between quantum decoherence theory and 1/f noise generation, showing that environmental interactions causing loss of quantum phase coherence necessarily produce 1/f spectral characteristics through the universal properties of quantum measurement and open quantum system dynamics, providing fundamental explanation for the ubiquity of 1/f noise across diverse physical systems.