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Articles 1  30 of 172
FullText Articles in Physics
Bounds On VacuumOrthogonal Lorentz And Cpt Violation From Radiative Corrections, Brett Altschul
Bounds On VacuumOrthogonal Lorentz And Cpt Violation From Radiative Corrections, Brett Altschul
Faculty Publications
Certain forms of Lorentz violation in the photon sector are difficult to bound directly, since they are “vacuum orthogonal”—meaning they do not change the solutions of the equations of motion in vacuum. However, these very same terms have a unique tendency to contribute large radiative corrections to effects in other sectors. Making use of this, we set bounds on four previously unconstrained d = 5 photon operators at the 10 − 25 – 10 − 31 GeV − 1 levels.
There Is No Ambiguity In The Radiatively Induced Gravitational ChernSimons Term, Brett Altschul
There Is No Ambiguity In The Radiatively Induced Gravitational ChernSimons Term, Brett Altschul
Faculty Publications
Quantum corrections to Lorentz and C P T violating QED in flat spacetime produce unusual radiative corrections, which can be finite but of undetermined magnitude. The corresponding radiative corrections in a gravitational theory are even stranger, since the term in the fermion action involving a preferred axial vector b μ would give rise to a gravitational ChernSimons term that is proportional b μ , yet which actually does not break Lorentz invariance. Initially, the coefficient of this gravitational ChernSimons term appears to have the same ambiguity as the coefficient for the analogous term in QED. However, this puzzle is resolved by ...
Hadronic Lorentz Violation In Chiral Perturbation Theory Including The Coupling To External Fields, Rasha Kamand, Brett Altschul, Matthias R. Schindler
Hadronic Lorentz Violation In Chiral Perturbation Theory Including The Coupling To External Fields, Rasha Kamand, Brett Altschul, Matthias R. Schindler
Faculty Publications
If any violation of Lorentz symmetry exists in the hadron sector, its ultimate origins must lie at the quark level. We continue the analysis of how the theories at these two levels are connected, using chiral perturbation theory. Considering a 2flavor quark theory, with dimension4 operators that break Lorentz symmetry, we derive a lowenergy theory of pions and nucleons that is invariant under local chiral transformations and includes the coupling to external fields. The pure meson and baryon sectors, as well as the couplings between them and the couplings to external electromagnetic and weak gauge fields, contain forms of Lorentz ...
Mode Analysis For Energetics Of A Moving Charge In Lorentz And Cpt Violating Electrodynamics, Richard Decosta, Brett Altschul
Mode Analysis For Energetics Of A Moving Charge In Lorentz And Cpt Violating Electrodynamics, Richard Decosta, Brett Altschul
Faculty Publications
In isotropic but Lorentz and CPT violating electrodynamics, it is known that a charge in uniform motion does not lose any energy to Cerenkov radiation. This presents a puzzle, since the radiation appears to be kinematically allowed for many modes. Studying the Fourier transforms of the most important terms in the modified magnetic field and Poynting vector, we confirm the vanishing of the radiation rate. Moreover, we show that the Fourier transform of the field changes sign between small and large wave numbers. This enables modes with very long wavelengths to carry negative energies, which cancel out the positive energies ...
No Contact Terms For The Magnetic Field In Lorentz And CptViolating Electrodynamics, Karl Schober, Brett Altschul
No Contact Terms For The Magnetic Field In Lorentz And CptViolating Electrodynamics, Karl Schober, Brett Altschul
Faculty Publications
In a Lorentz and CPTviolating modification of electrodynamics, the fields of a moving charge are known to have unusual singularities. This raises the question of whether the singular behavior may include δfunction contact terms, similar to those that appear in the fields of idealized dipoles. However, by calculating the magnetic field of an infinite straight wire in this theory, we demonstrate that there are no such contact terms in the magnetic field of a moving point charge.
Effect Of Z_{1/2}, Eh_{5}, And Ci1 Deep Defects On The Performance Of NType 4hSic Epitaxial Layers Schottky Detectors: Alpha Spectroscopy And Deep Level Transient Spectroscopy Studies, M. A. Mannan, S. K. Chaudhuri, K. V. Nguyen, K. C. Mandal
Effect Of Z1/2, Eh5, And Ci1 Deep Defects On The Performance Of NType 4hSic Epitaxial Layers Schottky Detectors: Alpha Spectroscopy And Deep Level Transient Spectroscopy Studies, M. A. Mannan, S. K. Chaudhuri, K. V. Nguyen, K. C. Mandal
Faculty Publications
No abstract provided.
Time Required For A Sphere To Fall Through A Funnel, J. Sridharan, Brett Altschul, S. Crittenden
Time Required For A Sphere To Fall Through A Funnel, J. Sridharan, Brett Altschul, S. Crittenden
Faculty Publications
We experimentally test a recently proposed theory of the behavior of a single frictional, inelastic, spherical particle falling under gravity through a symmetric funnel. We find that, while many qualitative results of the theory are supported by the data, the quantitative behavior of a real sphere falling through a real funnel differs from the predictions. The behavior above a 45◦ funnel angle, the duration, and the dependence of the duration on the initial horizontal position all show significant deviations from the predicted results. In particular, for drop positions near the gap, the duration of the fall is often significantly less ...
Enhanced Nucleate Boiling On Horizontal HydrophobicHydrophilic Carbon Nanotube Coatings, Xianming Dai, Xinyu Huang, Fanghao Yang, Xiaodong Li, Joshua Sightler, Yingchao Yang, Chen Li
Enhanced Nucleate Boiling On Horizontal HydrophobicHydrophilic Carbon Nanotube Coatings, Xianming Dai, Xinyu Huang, Fanghao Yang, Xiaodong Li, Joshua Sightler, Yingchao Yang, Chen Li
Faculty Publications
Ideal hydrophobichydrophilic composite cavities are highly desired to enhance nucleate boiling. However, it is challenging and costly to fabricate these types of cavities by conventional micro/nano fabrication techniques. In this study, a type of hydrophobichydrophilic composite interfaces were synthesized from functionalized multiwall carbon nanotubes by introducing hydrophilic functional groups on the pristine multiwall carbon nanotubes. This type of carbon nanotube enabled hydrophobichydrophilic composite interfaces were systematically characterized. Ideal cavities created by the interfaces were experimentally demonstrated to be the primary reason to substantially enhance nucleate boiling
Note: A Simple Thermal Gradient Annealing Unit For The Treatment Of Thin Films, C. J. Metting, Johnathan K. Bunn, Ellen A. Underwood, Yihao Zhu, G. Koley, T. Crawford, Jason R. HattrickSimpers
Note: A Simple Thermal Gradient Annealing Unit For The Treatment Of Thin Films, C. J. Metting, Johnathan K. Bunn, Ellen A. Underwood, Yihao Zhu, G. Koley, T. Crawford, Jason R. HattrickSimpers
Faculty Publications
A gradient annealing cell has been developed for the highthroughput study of thermalannealing effects on thinfilm libraries in different environments. The inexpensive gradientannealing unit permits temperature gradients as large as 28 °C/mm and can accommodate samples ranging in length from 13 mm to 51 mm. The system was validated by investigating the effects of annealing temperature on the crystallinity, resistivity, and transparency of tindoped indium oxide deposited on a glass substrate by magnetron sputtering. The unit developed in this work will permit the rapid optimization of materials properties such as crystallinity, homogeneity, and conductivity across a variety of applications.
Optical DownConversion In Doped Znse:Tb3+ Nanocrystals, Sandip Das, K. C. Mandal
Optical DownConversion In Doped Znse:Tb3+ Nanocrystals, Sandip Das, K. C. Mandal
Faculty Publications
No abstract provided.
Experimental Determination Of ElectronHole Pair Creation Energy In 4hSic Epitaxial Layer: An Absolute Calibration Approach, S. K. Chaudhuri, K. J. Zavalla, K. C. Mandal
Experimental Determination Of ElectronHole Pair Creation Energy In 4hSic Epitaxial Layer: An Absolute Calibration Approach, S. K. Chaudhuri, K. J. Zavalla, K. C. Mandal
Faculty Publications
No abstract provided.
The Schrödinger Equation With Friction From The Quantum Trajectory Perspective, Sophya V. Garashchuk, V. Dixit, B. Gu, J. Mazzuca
The Schrödinger Equation With Friction From The Quantum Trajectory Perspective, Sophya V. Garashchuk, V. Dixit, B. Gu, J. Mazzuca
Faculty Publications
Similarity of equations of motion for the classical and quantum trajectories is used to introduce afriction term dependent on the wavefunction phase into the timedependent Schrödingerequation. The term describes irreversible energy loss by the quantum system. The force offriction is proportional to the velocity of a quantum trajectory. The resulting Schrödinger equationis nonlinear, conserves wavefunction normalization, and evolves an arbitrary wavefunction into the ground state of the system (of appropriate symmetry if applicable). Decrease in energy is proportional to the average kinetic energy of the quantum trajectory ensemble. Dynamics in the high friction regime is suitable for simple models of ...
Applications Of High Throughput (Combinatorial) Methodologies To Electronic, Magnetic, Optical, And EnergyRelated Materials, Martin L. Green, Ichiro Takeuchi, Jason R. HattrickSimpers
Applications Of High Throughput (Combinatorial) Methodologies To Electronic, Magnetic, Optical, And EnergyRelated Materials, Martin L. Green, Ichiro Takeuchi, Jason R. HattrickSimpers
Faculty Publications
High throughput (combinatorial) materials science methodology is a relatively new research paradigm that offers the promise of rapid and efficient materials screening, optimization, and discovery. The paradigm started in the pharmaceutical industry but was rapidly adopted to accelerate materials research in a wide variety of areas. High throughput experiments are characterized by synthesis of a “library” sample that contains the materials variation of interest (typically composition), and rapid and localized measurement schemes that result in massive data sets. Because the data are collected at the same time on the same “library” sample, they can be highly uniform with respect to ...
Simulation Studying Effects Of Multiple Primary Aberrations On DonutShaped Gaussian Beam, Chen Zhang, K. Wang, J. Bai, Y. Liu, Guiren Wang
Simulation Studying Effects Of Multiple Primary Aberrations On DonutShaped Gaussian Beam, Chen Zhang, K. Wang, J. Bai, Y. Liu, Guiren Wang
Faculty Publications
In this paper, we demonstrate the variation of donutshaped depletion pattern which influenced by multiple primary aberrations. The simulation is base on a common stimulation emission of depletion (STED) system composed by Gaussian laser and vortex phase plate. The simulation results are helpful guidelines for analyzing the aberration of depletion patterns in real situations.
Incorporation Of Quantum Effects For Selected Degrees Of Freedom Into The TrajectoryBased Dynamics Using Spatial Domains, Sophya V. Garashchuk, M. V. Volkov
Incorporation Of Quantum Effects For Selected Degrees Of Freedom Into The TrajectoryBased Dynamics Using Spatial Domains, Sophya V. Garashchuk, M. V. Volkov
Faculty Publications
The approach of defining quantum corrections on nuclear dynamics of molecular systems incorporated approximately into selected degrees of freedom, is described. The approach is based on the MadelungdeBroglieBohm formulation of timedependent quantum mechanics which represents a wavefunction in terms of an ensemble of trajectories. The trajectories follow classical laws of motion except that the quantum potential, dependent on the wavefunction amplitude and its derivatives, is added to the external, classical potential. In this framework the quantum potential, determined approximately for practical reasons, is included only into the “quantum” degrees of freedom describing light particles such as protons, while neglecting with ...
Time Reversal Invariance Violating And Parity Conserving Effects In NeutronDeuteron Scattering, YoungHo Song, Rimantas Lazauskas, Vladimir Gudkov
Time Reversal Invariance Violating And Parity Conserving Effects In NeutronDeuteron Scattering, YoungHo Song, Rimantas Lazauskas, Vladimir Gudkov
Faculty Publications
Time reversal invariance violating and parity conserving effects for lowenergy elastic neutrondeuteronscattering are calculated for meson exchange and effective field theory type potentials in a distorted wavebornapproximation using realistic hadronic wave functions, obtained by solving threebody Faddeev equations inconfiguration space.
Dynamics Of Spin Relaxation In FiniteSize TwoDimensional Systems: An Exact Solution, Valeriy A. Slipko, Yuriy V. Pershin
Dynamics Of Spin Relaxation In FiniteSize TwoDimensional Systems: An Exact Solution, Valeriy A. Slipko, Yuriy V. Pershin
Faculty Publications
We find an exact solution for the problem of electron spin relaxation in a twodimensional (2D) circle with Rashba spinorbit interaction. Our analysis shows that the spin relaxation in finitesize regions involves three stages and is described by multiple spin relaxation times. It is important that the longest spin relaxation time increases with the decrease in system radius but always remains finite. Therefore, at long times, the spin polarization in small 2D systems decays exponentially with a sizedependent rate. This prediction is supported by results of Monte Carlo simulations.
Time Reversal Invariance Violation In NeutronDeuteron Scattering, YoungHo Song, Rimantas Lazauskas, Vladimir Gudkov
Time Reversal Invariance Violation In NeutronDeuteron Scattering, YoungHo Song, Rimantas Lazauskas, Vladimir Gudkov
Faculty Publications
Time reversal invarianceviolating (TRIV) effects in lowenergy elastic neutrondeuteron scattering arecalculated using meson exchange and EFTtype TRIV potentials in a distortedwave Born approximation withrealistic hadronic strong interaction wave functions, obtained by solving the threebody Faddeev equations inconfiguration space. The relation between TRIV and parityviolating observables is discussed.
Growth Direction Modulation And DiameterDependent Mobility In Inn Nanowires, Goutam Koley, Zhihua Cai, Ehtesham Bin Quddus, Jie Liu, Muhammad Qazi, Richard A. Webb
Growth Direction Modulation And DiameterDependent Mobility In Inn Nanowires, Goutam Koley, Zhihua Cai, Ehtesham Bin Quddus, Jie Liu, Muhammad Qazi, Richard A. Webb
Faculty Publications
Diameterdependent electrical properties of InN nanowires (NWs) grown by chemical vapor deposition have been investigated. The NWs exhibited interesting properties of coplanar deflection at specific angles, either spontaneously, or when induced by other NWs or lithographically patterned barriers. InN NWbased backgated field effect transistors (FETs) showed excellent gate control and drain current saturation behaviors. Both NW conductance and carrier mobility calculated from the FET characteristics were found to increase regularly with a decrease in NW diameter. The observed mobility and conductivity variations have been modeled by considering NW surface and core conduction paths.
Spontaneous Emergence Of A Persistent Spin Helix From Homogeneous Spin Polarization, Valeriy A. Slipko, Ibrahim Savran, Yuriy V. Pershin Dr
Spontaneous Emergence Of A Persistent Spin Helix From Homogeneous Spin Polarization, Valeriy A. Slipko, Ibrahim Savran, Yuriy V. Pershin Dr
Faculty Publications
We demonstrate that a homogeneous spin polarization in onedimensional structures of finite length in the presence of BychkovRashba spinorbit coupling decays spontaneously toward a persistent spin helix. Such a strikingly different and simple method enables us to generate robust spin structures whose properties can be tuned by the strength of the spinorbit interaction and/or the structure’s length. We generalize our results for the twodimensional case predicting the formation of a persistent spin helix in twodimensional channels from homogeneous spin polarization. An analysis of the formation of a spin helical state is presented within an approach based on a ...
Parametric Resonance Enhancement In Neutron Interferometry And Application For The Search For NonNewtonian Gravity, Vladimir Gudkov, Hirohiko M. Shimizu, Geoffrey L. Greene
Parametric Resonance Enhancement In Neutron Interferometry And Application For The Search For NonNewtonian Gravity, Vladimir Gudkov, Hirohiko M. Shimizu, Geoffrey L. Greene
Faculty Publications
The parametric resonance enhancement of the phase of neutrons due to nonNewtonian anomalous gravitationis considered. The existence of such resonances is confirmed by numerical calculations. A possible experimentalscheme for observing this effect is discussed based on an existing neutron interferometer design.
Parity Violation In LowEnergy NeutronDeuteron Scattering, YoungHo Song, Rimantas Lazauskas, Vladimir Gudkov
Parity Violation In LowEnergy NeutronDeuteron Scattering, YoungHo Song, Rimantas Lazauskas, Vladimir Gudkov
Faculty Publications
Parityviolating effects for lowenergy elastic neutron deuteron scattering are calculated for Desplanques,Donoghue, and Holstein (DDH) and effective field theory types of weak potentials in a distortedwave Bornapproximation, using realistic hadronic strong interaction wave functions, obtained by solving threebodyFaddeev equations in configuration space. The resulting relation between physical observables and lowenergyconstants can be used to fix lowenergy constants from experiments. Potential model dependencies ofparityviolating effects are discussed.
Optical Cell For Combinatorial In Situ Raman Spectroscopic Measurements Of Hydrogen Storage Materials At High Pressures And Temperatures, Jason R. HattrickSimpers, Wilbur S. Hurst, Sesha S. Srinivasan, James E. Maslar
Optical Cell For Combinatorial In Situ Raman Spectroscopic Measurements Of Hydrogen Storage Materials At High Pressures And Temperatures, Jason R. HattrickSimpers, Wilbur S. Hurst, Sesha S. Srinivasan, James E. Maslar
Faculty Publications
An optical cell is described for highthroughput backscattering Raman spectroscopic measurements of hydrogen storagematerials at pressures up to 10 MPa and temperatures up to 823 K. High throughput is obtained by employing a 60 mm diameter × 9 mm thick sapphire window, with a corresponding 50 mm diameter unobstructed optical aperture. To reproducibly seal this relatively large window to the cell body at elevated temperatures and pressures, a gold oring is employed. The sample holdertowindow distance is adjustable, making this cell design compatible with optical measurement systems incorporating lenses of significantly different focal lengths, e.g., microscope objectives and single element ...
Density Functional Theory Study On The Electronic Structure Of N And PType Doped Srtio_{3} At Anodic Solid Oxide Fuel Cell Conditions, S. Suthirakun, Salai Cheettu Ammal, G. Xiao, Fanglin Chen, HansConrad Zur Loye, Andreas Heyden
Density Functional Theory Study On The Electronic Structure Of N And PType Doped Srtio3 At Anodic Solid Oxide Fuel Cell Conditions, S. Suthirakun, Salai Cheettu Ammal, G. Xiao, Fanglin Chen, HansConrad Zur Loye, Andreas Heyden
Faculty Publications
The electronic conductivity and thermodynamic stability of mixed ntype and ptype doped SrTiO3 have been investigated at anodic solid oxide fuel cell (SOFC) conditions using density functional theory (DFT) calculations. In particular, constrained ab initio thermodynamic calculations have been performed to evaluate the phase stability and reducibility of various Nb and Gadoped SrTiO3 at synthesized and anodic SOFC conditions. The density of states (DOS) of these materials was analyzed to study the effects of n and pdoping on the electronic conductivity. In agreement with experimental observations, we find that the transformation from 20% Nbdoped Srdeficient SrTiO3 to a nonSrdeficient phase ...
Systematic Approach To Electrostatically Induced 2d Crystallization Of Nanoparticles At Liquid Interfaces, S. Kewalramani, S. Wang, Y. Lin, H. G. Nguyen, Qian Wang, M. Fukuto, L. Yang
Systematic Approach To Electrostatically Induced 2d Crystallization Of Nanoparticles At Liquid Interfaces, S. Kewalramani, S. Wang, Y. Lin, H. G. Nguyen, Qian Wang, M. Fukuto, L. Yang
Faculty Publications
We report an experimental demonstration of a strategy for inducing twodimensional (2D)crystallization of charged nanoparticles on oppositely charged fluid interfaces. This strategy aims to maximize the interfacial adsorption of nanoparticles, and hence their lateral packing density, by utilizing a combination of weakly charged particles and a high surface charge density on the planar interface. In order to test this approach, we investigated the assembly of cowpea mosaic virus (CPMV) on positively charged lipid monolayers at the aqueous solution surface, by means of in situXray scattering measurements at the liquid–vapor interface. Theassembly was studied as a function of ...
Efficient Quantum Trajectory Representation Of Wavefunctions Evolving In Imaginary Time, Sophya V. Garashchuk, J. Mazzuca, T. Vazhappilly
Efficient Quantum Trajectory Representation Of Wavefunctions Evolving In Imaginary Time, Sophya V. Garashchuk, J. Mazzuca, T. Vazhappilly
Faculty Publications
The Boltzmann evolution of a wavefunction can be recast as imaginarytime dynamics of the quantum trajectory ensemble. The quantum effects arise from the momentumdependent quantum potential – computed approximately to be practical in highdimensional systems – influencing the trajectories in addition to the external classical potential [S. Garashchuk, J. Chem. Phys.132, 014112 (2010)]. For a nodelesswavefunction represented as ψ(x, t) = exp ( −S(x, t)/ℏ) with the trajectory momenta defined by ∇S(x, t), analysis of the Lagrangian and Eulerian evolution shows that for bound potentials the former is more accurate while the latter is more practical because the Lagrangian ...
Parity Violation In The N + 3he → 3h + P Reaction: Resonance Approach, Vladimir Gudkov
Parity Violation In The N + 3he → 3h + P Reaction: Resonance Approach, Vladimir Gudkov
Faculty Publications
The method based on microscopic theory of nuclear reactions has been applied for the analysis of parityviolatingeffects in fewbody systems. Different parityviolating and parityconserving asymmetries and theirdependence on neutron energy have been estimated for the n + 3He → 3H + p reaction. The estimated effectsare in a good agreement with available exact calculations.
Doping Dependence Of Electronic And Mechanical Properties Of Gase_{1−X}Te_{X} And Ga_{1−X}In_{X}Se From First Principles, Zs. Rak, S. D. Mahanti, K. C. Mandal, N. C. Fernelius
Doping Dependence Of Electronic And Mechanical Properties Of Gase1−XTeX And Ga1−XInXSe From First Principles, Zs. Rak, S. D. Mahanti, K. C. Mandal, N. C. Fernelius
Faculty Publications
No abstract provided.
Radical Spin Helix In TwoDimensional Electron Systems With Rashba SpinOrbit Coupling, Yuriy V. Pershin Dr, Valeriy A. Slipko
Radical Spin Helix In TwoDimensional Electron Systems With Rashba SpinOrbit Coupling, Yuriy V. Pershin Dr, Valeriy A. Slipko
Faculty Publications
We suggest a longlived spinpolarization structure, a radial spin helix, and study its relaxation dynamics. For this purpose, starting with a system of equations for spinpolarization density, we find its general solution in the axially symmetric case. It is demonstrated that the radial spin helix of a certain period relaxes slower than homogeneous spin polarization and plain spin helix. Importantly, the spin polarization at the center of the radial spin helix stays almost unchanged at short times. At longer times, when the initial nonexponential relaxation region ends, the relaxation of the radial spin helix occurs with the same time constant ...
Memristive Adaptive Filters, T. Driscoll, J. Quinn, S. Klein, H. T. Kim, B. J. Kim, Yuriy V. Pershin Dr, M. Di Ventra, D. N. Basov
Memristive Adaptive Filters, T. Driscoll, J. Quinn, S. Klein, H. T. Kim, B. J. Kim, Yuriy V. Pershin Dr, M. Di Ventra, D. N. Basov
Faculty Publications
Using the memristive properties of vanadium dioxide, we experimentally demonstrate an adaptive filter by placing a memristor into an LC contour. This circuit reacts to the application of select frequency signals by sharpening the quality factor of its resonant response, and thus “learns” according to the input waveform. The proposed circuit employs only analog passive elements, and may find applications in biologically inspired processing and information storage. We also extend the learningcircuit framework mathematically to include memoryreactive elements, such as memcapacitors and meminductors, and show how this expands the functionality of adaptive memory filters.