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Articles 1  11 of 11
FullText Articles in Physics
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 ...