John Harris Miller, Jr. | |
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Born | United States |
Alma mater | Northwestern University (B.S.) University of Illinois at Urbana-Champaign (Ph.D) |
Known for | Charge density wave Impedance spectroscopy of living organisms |
Scientific career | |
Fields | Physics Electronics |
Institutions | University of Illinois University of North Carolina at Chapel Hill University of Houston |
Doctoral advisor | John Bardeen J. R. Tucker |
John Harris Miller Jr. is an American physicist with important contributions to the fields of physics, biophysics, Impedance spectroscopy, and material science, mainly known for his role in Charge density wave (in explaining the collective quantum transport of electrons in charge density waves), research work on Cuprates and Impedance spectroscopy of living organisms. [1] [2] [3] [4] He is particularly known for an effect "Collective Quantum Tunneling of CDW Electrons" [5] and for a well-known paper on the topic written by him and his colleagues, as published in Physical Review Letters. [6] He was a noteworthy student of the twice Nobel laureate physicist John Bardeen who mentioned him at several places in his biography "True Genius: The Life and Science of John Bardeen" (John Bardeen) [7] (particularly in Chapter 15 of the book which discusses the work which Miller carried out under the guidance of Bardeen and J. R. Tucker).
Miller grew up in the Sangre de Cristo Mountains of northern New Mexico. His family lived in the small resort town of Red River. His parents were owners of the small beginner ski area at the Powder Puff mountain, and later Enchanted Forest Cross Country Ski Area. He attended school in Questa, New Mexico, where many descendants of the original Spanish conquistadores live, some speaking a sixteenth-century dialect of Spanish. He was a slalom, giant slalom, and downhill ski racer, first on the Red River and later on the Taos ski teams. While an undergraduate, he was a member of the Northwestern University Ski Team, acting as both captain and coach during one season.
After completing his high school, Miller completed his bachelor's degree in electrical engineering at Northwestern University (1980) and his doctorate, in 1985, from the University of Illinois at Urbana-Champaign in physics, under J. R. Tucker and John Bardeen as his advisors. His PhD project was a combined experimental-theoretical study of quantum transport of electrons in Charge density waves, as one of the last students to work with Bardeen, who was the co-inventor of the transistor and the only recipient of two Nobel laurels in physics (his second Nobel prize awarded for the BCS theory of superconductivity).
Soon after completion of his PhD, he was awarded a prestigious IBM Postdoctoral fellowship at the University of Illinois. He joined the University of North Carolina at Chapel Hill in 1986 as an assistant professor of physics, where he remained till 1989, before joining the University of Houston, Department of Physics faculty, where he continues as a full professor of physics, in addition to being the director, HTS Device, Biophysics, and Charge Transport Lab at the Texas Center for Superconductivity at University of Houston. He has held the adjunct assistant professorship of pediatric cardiology at the Baylor College of Medicine, from 1994 to 2004. In 1987 he was selected for and awarded the Alfred P. Sloan Research Fellowship.
While exploring biomedical applications of novel superconducting devices (such as SQUIDs and SQUID-based sensitive magnetometers) at the University of Houston, he laid down the foundations of a Biophysics research group in association with researchers in the Texas Medical Center (TMC) in the mid 1990s. The group has expanded and evolved significantly since then, to develop new techniques and devices to study various living organisms. His group's work on the dielectric properties of living cells and organelles led to studying the electromagnetic properties of living cells and creating collaborations with TMC researchers (including Dale Hamilton, MD) to develop electromagnetic biosensors to detect metabolic activity in mitochondria, as related to various human conditions such as obesity and its complications (under various grants funded by the National Institutes of Health with Miller as their P.I.). This led also to group's various theoretical efforts, such as development of electric field-driven torque models of the mitochondrial motor ATP synthase and efforts to understand mechanisms of disease-implicated mitochondrial mutations in the Electron transport chain, [8] [9] [10] [11] [12] as well as reports of measurement of intrinsic electromagnetic activity and noise from living yeast cells in their best metabolic conditions. [13] [14]
His group has also been involved with computational studies of localization of electron holes in the DNA, finding a correlation between sites of hole localization and nucleotide positions of human mutations in mitochondrial DNA. This has led to a (experimental as yet) computational DNA hole spectroscopy method, which they discuss in a publication, [15] in collaboration with the reputed UH evolutionary biologist Ricardo Azevedo.
Miller in association with his colleagues has recently proposed the idea of "Martian soil Biosensors" based on their developed techniques of dielectric spectroscopy. [16]
John Bardeen was an American physicist and electrical engineer. He is the only person to be awarded the Nobel Prize in Physics twice: first in 1956 with William Shockley and Walter Brattain for the invention of the transistor; and again in 1972 with Leon N. Cooper and John Robert Schrieffer for a fundamental theory of conventional superconductivity known as the BCS theory.
Photoluminescence is light emission from any form of matter after the absorption of photons. It is one of many forms of luminescence and is initiated by photoexcitation, hence the prefix photo-. Following excitation, various relaxation processes typically occur in which other photons are re-radiated. Time periods between absorption and emission may vary: ranging from short femtosecond-regime for emission involving free-carrier plasma in inorganic semiconductors up to milliseconds for phosphoresence processes in molecular systems; and under special circumstances delay of emission may even span to minutes or hours.
Matter waves are a central part of the theory of quantum mechanics, being half of wave–particle duality. At all scales where measurements have been practical, matter exhibits wave-like behavior. For example, a beam of electrons can be diffracted just like a beam of light or a water wave.
Dielectric spectroscopy measures the dielectric properties of a medium as a function of frequency. It is based on the interaction of an external field with the electric dipole moment of the sample, often expressed by permittivity.
In physics, topological order is a kind of order in the zero-temperature phase of matter. Macroscopically, topological order is defined and described by robust ground state degeneracy and quantized non-abelian geometric phases of degenerate ground states. Microscopically, topological orders correspond to patterns of long-range quantum entanglement. States with different topological orders cannot change into each other without a phase transition.
Car–Parrinello molecular dynamics or CPMD refers to either a method used in molecular dynamics or the computational chemistry software package used to implement this method.
A charge density wave (CDW) is an ordered quantum fluid of electrons in a linear chain compound or layered crystal. The electrons within a CDW form a standing wave pattern and sometimes collectively carry an electric current. The electrons in such a CDW, like those in a superconductor, can flow through a linear chain compound en masse, in a highly correlated fashion. Unlike a superconductor, however, the electric CDW current often flows in a jerky fashion, much like water dripping from a faucet due to its electrostatic properties. In a CDW, the combined effects of pinning and electrostatic interactions likely play critical roles in the CDW current's jerky behavior, as discussed in sections 4 & 5 below.
The nitrogen-vacancy center is one of numerous photoluminescent point defects in diamond. Its most explored and useful properties include its spin-dependent photoluminescence, and its relatively long (millisecond) spin coherence at room temperature. The NV center energy levels are modified by magnetic fields, electric fields, temperature, and strain, which allow it to serve as a sensor of a variety of physical phenomena. Its atomic size and spin properties can form the basis for useful quantum sensors. It has also been explored for applications in quantum computing, quantum simulation, and spintronics.
Surface plasmons (SPs) are coherent delocalized electron oscillations that exist at the interface between any two materials where the real part of the dielectric function changes sign across the interface. SPs have lower energy than bulk plasmons which quantise the longitudinal electron oscillations about positive ion cores within the bulk of an electron gas.
Positron annihilation spectroscopy (PAS) or sometimes specifically referred to as positron annihilation lifetime spectroscopy (PALS) is a non-destructive spectroscopy technique to study voids and defects in solids.
CP2K is a freely available (GPL) quantum chemistry and solid state physics program package, written in Fortran 2008, to perform atomistic simulations of solid state, liquid, molecular, periodic, material, crystal, and biological systems. It provides a general framework for different methods: density functional theory (DFT) using a mixed Gaussian and plane waves approach (GPW) via LDA, GGA, MP2, or RPA levels of theory, classical pair and many-body potentials, semi-empirical and tight-binding Hamiltonians, as well as Quantum Mechanics/Molecular Mechanics (QM/MM) hybrid schemes relying on the Gaussian Expansion of the Electrostatic Potential (GEEP). The Gaussian and Augmented Plane Waves method (GAPW) as an extension of the GPW method allows for all-electron calculations. CP2K can do simulations of molecular dynamics, metadynamics, Monte Carlo, Ehrenfest dynamics, vibrational analysis, core level spectroscopy, energy minimization, and transition state optimization using NEB or dimer method.
A trojan wave packet is a wave packet that is nonstationary and nonspreading. It is part of an artificially created system that consists of a nucleus and one or more electron wave packets, and that is highly excited under a continuous electromagnetic field. Its discovery as one of significant contributions to the Quantum Theory was awarded the 2022 Wigner Medal for Iwo Bialynicki-Birula
A trion is a bound state of three charged particles. A negatively charged trion in crystals consists of two electrons and one hole, while a positively charged trion consists of two holes and one electron. The binding energy of a trion is largely determined by the exchange interaction between the two electrons (holes). The ground state of a negatively charged trion is a singlet. The triplet state is unbound in the absence of an additional potential or sufficiently strong magnetic field.
Girsh Blumberg is an Estonian-American physicist working in the experimental physics fields of condensed matter physics, spectroscopy, nano-optics, and plasmonics. Blumberg is an elected fellow of the American Physical Society (APS), an elected Fellow of the American Association for the Advancement of Science (FAAAS) , and a Distinguished Professor of Physics at Rutgers University.
Terahertz spectroscopy detects and controls properties of matter with electromagnetic fields that are in the frequency range between a few hundred gigahertz and several terahertz. In many-body systems, several of the relevant states have an energy difference that matches with the energy of a THz photon. Therefore, THz spectroscopy provides a particularly powerful method in resolving and controlling individual transitions between different many-body states. By doing this, one gains new insights about many-body quantum kinetics and how that can be utilized in developing new technologies that are optimized up to the elementary quantum level.
The light-front quantization of quantum field theories provides a useful alternative to ordinary equal-time quantization. In particular, it can lead to a relativistic description of bound systems in terms of quantum-mechanical wave functions. The quantization is based on the choice of light-front coordinates, where plays the role of time and the corresponding spatial coordinate is . Here, is the ordinary time, is a Cartesian coordinate, and is the speed of light. The other two Cartesian coordinates, and , are untouched and often called transverse or perpendicular, denoted by symbols of the type . The choice of the frame of reference where the time and -axis are defined can be left unspecified in an exactly soluble relativistic theory, but in practical calculations some choices may be more suitable than others. The basic formalism is discussed elsewhere.
The light-front quantization of quantum field theories provides a useful alternative to ordinary equal-time quantization. In particular, it can lead to a relativistic description of bound systems in terms of quantum-mechanical wave functions. The quantization is based on the choice of light-front coordinates, where plays the role of time and the corresponding spatial coordinate is . Here, is the ordinary time, is one Cartesian coordinate, and is the speed of light. The other two Cartesian coordinates, and , are untouched and often called transverse or perpendicular, denoted by symbols of the type . The choice of the frame of reference where the time and -axis are defined can be left unspecified in an exactly soluble relativistic theory, but in practical calculations some choices may be more suitable than others.
Quantum crystallography is a branch of crystallography that investigates crystalline materials within the framework of quantum mechanics, with analysis and representation, in position or in momentum space, of quantities like wave function, electron charge and spin density, density matrices and all properties related to them. Like the quantum chemistry, Quantum crystallography involves both experimental and computational work. The theoretical part of quantum crystallography is based on quantum mechanical calculations of atomic/molecular/crystal wave functions, density matrices or density models, used to simulate the electronic structure of a crystalline material. While in quantum chemistry, the experimental works mainly rely on spectroscopy, in quantum crystallography the scattering techniques play the central role, although spectroscopy as well as atomic microscopy are also sources of information.
Electrons in free space can carry quantized orbital angular momentum (OAM) projected along the direction of propagation. This orbital angular momentum corresponds to helical wavefronts, or, equivalently, a phase proportional to the azimuthal angle. Electron beams with quantized orbital angular momentum are also called electron vortex beams.
Malvin Carl Teich is an American electrical engineer, physicist, and computational neuroscientist which is professor emeritus of electrical engineering at Columbia University and physics at Boston University. He is also a consultant to government, academia, and private industry, where he serves as an advisor in intellectual-property conflicts. He is the coauthor of Fundamentals of Photonics, and of Fractal-Based Point Processes.