Results for "M. Titov"

total 205278took 0.13s
Impurity-assisted tunneling in grapheneNov 01 2006May 07 2007The electric conductance of a strip of undoped graphene increases in the presence of a disorder potential, which is smooth on atomic scales. The phenomenon is attributed to impurity-assisted resonant tunneling of massless Dirac fermions. Employing the ... More
Thermopower oscillations in mesoscopic Andreev interferometersOct 05 2008Dec 04 2008Anomalously large thermopower of mesoscopic normal-metal/superconductor interferometers has been investigated by Chandrasekhar et al. It was shown that, depending on the geometry of the interferometer, the thermopower is either symmetric or antisymmetric ... More
Spin-torque resonance due to diffusive dynamics at a surface of topological insulatorOct 13 2018May 23 2019We investigate spin-orbit torques on magnetization in an insulating ferromagnetic (FM) layer that is brought into a close proximity to a topological insulator (TI). In addition to the well-known field-like spin-orbit torque, we identify an anisotropic ... More
Random matrix theory of proximity effect in disordered wiresAug 06 2002Oct 22 2002We study analytically the local density of states in a disordered normal-metal wire at ballistic distance to a superconductor. Our calculation is based on a scattering-matrix approach, which concerns for wave-function localisation in the normal metal, ... More
Statistics of finite-time Lyapunov exponents in a random time-dependent potentialApr 17 2002The sensitivity of trajectories over finite time intervals t to perturbations of the initial conditions can be associated with a finite-time Lyapunov exponent lambda, obtained from the elements M_{ij} of the stability matrix M. For globally chaotic dynamics ... More
Short-distance wavefunction statistics in one-dimensional Anderson localizationFeb 07 2003Sep 04 2003We investigate the short-distance statistics of the local density of states nu in long one-dimensional disordered systems, which display Anderson localization. It is shown that the probability distribution function P(nu) can be recovered from the long-distance ... More
Anomalies and non-log-normal tails in one-dimensional localization with power-law disorderFeb 27 2003Within a general framework, we discuss the wave function statistics in the Lloyd model of Anderson localization on a one-dimensional lattice with a Cauchy distribution for the random on-site potential. We demonstrate that already in leading order in the ... More
Non-universality of Anderson localization in short-range correlated disorderApr 03 2005Nov 09 2005We provide an analytic theory of Anderson localization on a lattice with a weak short-range correlated disordered potential. Contrary to the general belief we demonstrate that even next-neighbor statistical correlations in the potential can give rise ... More
Band-center anomaly of the conductance distribution in one-dimensional Anderson localizationAug 23 2002We analyze the conductance distribution function in the one-dimensional Anderson model of localization, for arbitrary energy. For energy at the band center the distribution function deviates from the universal form assumed in single-parameter scaling ... More
Encoding Sentences with Graph Convolutional Networks for Semantic Role LabelingMar 14 2017Jul 30 2017Semantic role labeling (SRL) is the task of identifying the predicate-argument structure of a sentence. It is typically regarded as an important step in the standard NLP pipeline. As the semantic representations are closely related to syntactic ones, ... More
Metal-Insulator Transition in Graphene on Boron NitrideJan 29 2014Aug 15 2014Electrons in graphene aligned with hexagonal boron nitride are modelled by Dirac fermions in a correlated random-mass landscape subject to a scalar- and vector-potential disorder. We find that the system is insulating in the commensurate phase since the ... More
Korshunov instantons out of equilibriumAug 11 2015Apr 23 2016Zero-dimensional dissipative action possesses non-trivial minima known as Korshunov instantons. They have been known so far only for imaginary time representation that is limited to equilibrium systems. In this work we reconstruct and generalise Korshunov ... More
Ballistic charge transport in chiral-symmetric few-layer grapheneJun 26 2009Mar 11 2010A transfer matrix approach to study ballistic charge transport in few-layer graphene with chiral-symmetric stacking configurations is developed. We demonstrate that the chiral symmetry justifies a non-Abelian gauge transformation at the spectral degeneracy ... More
Finite-temperature Bell test for quasiparticle entanglement in the Fermi seaOct 01 2007Mar 07 2008We demonstrate that the Bell test cannot be realized at finite temperatures in the vast majority of electronic setups proposed previously for quantum entanglement generation. This fundamental difficulty is shown to originate in a finite probability of ... More
Parity violation in deuteron photo-disintegrationMar 01 2004Mar 21 2004We analyze the energy dependence for two types of parity-non-conserving (PNC) asymmetries in the reaction $\gamma D\to np$ in the near-threshold region. The first one is the asymmetry in reaction with circularly polarized photon beam and unpolarized deuteron ... More
Neutrino-Dark Matter PortalsApr 08 2019The nature of dark matter is one of the open problems of the Standard Model of particle physics. Despite the great experimental efforts, we have not yet found a positive signal of its interactions with ordinary matter. One possible explanation would be ... More
Electron-hole asymmetry in two-terminal graphene devicesFeb 16 2011May 10 2011A theoretical model is proposed to describe asymmetric gate-voltage dependence of conductance and noise in two-terminal ballistic graphene devices. The model is analyzed independently within the self-consistent Hartree and Thomas-Fermi approximations. ... More
Diamagnetism of metallic nanoparticles as the result of strong spin-orbit interactionMar 13 2019Mar 14 2019The magnetic susceptibility of an ensemble of clean metallic nanoparticles is shown to change from paramagnetic to diamagnetic one with the onset of spin-orbit interaction. The effect is quantified on the basis of symmetry analysis with the help of the ... More
Diamagnetism of metallic nanoparticles as the result of strong spin-orbit interactionMar 13 2019The magnetic susceptibility of an ensemble of clean metallic nanoparticles is shown to change from paramagnetic to diamagnetic one with the onset of spin-orbit interaction. The effect is quantified on the basis of symmetry analysis with the help of the ... More
Interaction-induced Renormalization of Andreev ReflectionAug 01 2006We analyze the charge transport between a one-dimensional weakly interacting electron gas and a superconductor within the scaling approach in the basis of scattering states. We derive the renormalization group equations, which fully account for the intrinsic ... More
Dirac-Kronig-Penney model for strain-engineered grapheneJun 18 2010Sep 13 2010Motivated by recent proposals on strain-engineering of graphene electronic circuits we calculate conductivity, shot-noise and the density of states in periodically deformed graphene. We provide the solution to the Dirac-Kronig-Penney model, which describes ... More
Josephson effect in ballistic grapheneMay 23 2006We solve the Dirac-Bogoliubov-De-Gennes equation in an impurity-free superconductor-normal-superconductor (SNS) junction, to determine the maximal supercurrent that can flow through an undoped strip of graphene with heavily doped superconducting electrodes. ... More
Signature of wave localisation in the time dependence of a reflected pulseMay 02 2000Aug 04 2000The average power spectrum of a pulse reflected by a disordered medium embedded in an N-mode waveguide decays in time with a power law t^(-p). We show that the exponent p increases from 3/2 to 2 after N^2 scattering times, due to the onset of localisation. ... More
Parity non-conservation in nuclear excitation by circularly polarized photon beamMay 31 2006Jun 09 2006We show that the asymmetries in the nuclear resonance fluorescence processes with a circular polarized photon beam may be used as a tool for studying the parity non-conservation (PNC) in nuclei. The PNC asymmetry measurements both in exciting the parity ... More
Spin-Orbit Torques in Two-Dimensional Rashba FerromagnetsMar 23 2015Jul 13 2015Magnetization dynamics in single-domain ferromagnets can be triggered by charge current if spin-orbit coupling is sufficiently strong. We apply functional Keldysh theory to investigate Rashba spin-orbit torques in metallic two-dimensional ferromagnets. ... More
All-electron Dirac-Coulomb and RECP calculations of excitation energies for mercury atom with combined CI/MBPT2 methodApr 13 1998Calculations of transition energies between low-lying states of mercury atom are performed in the frame of combined CI/MBPT2 method. Results of all-electron relativistic calculations (using the Dirac-Coulomb Hamiltonian) are compared with experimental ... More
Exploiting Semantics in Neural Machine Translation with Graph Convolutional NetworksApr 23 2018Semantic representations have long been argued as potentially useful for enforcing meaning preservation and improving generalization performance of machine translation methods. In this work, we are the first to incorporate information about predicate-argument ... More
Interpretable Neural Predictions with Differentiable Binary VariablesMay 20 2019The success of neural networks comes hand in hand with a desire for more interpretability. We focus on text classifiers and make them more interpretable by having them provide a justification, a rationale, for their predictions. We approach this problem ... More
Aging tests of the proportional wire chambers using Ar/CF4/CH4 (74:20:6), Ar/CF4/CH4 (67:30:3), Ar/CF4/CO2 (65:30:5) mixtures for the HERA-B Muon DetectorJul 28 2001Apr 09 2002The Muon Detector of the HERA-B experiment at DESY is a gaseous detector that provides muon identification in a high-rate hadronic environment. We present our studies on the properties of several fast gases, Ar/CF4/CH4 (74:20:6), Ar/CF4/CH4 (67:30:3) ... More
Magnon activation by hot electrons via non-quasiparticle statesMar 23 2017We consider the situation when a femtosecond laser pulse creates a hot electron state in half-metallic ferromagnet (e. g. ferromagnetic semiconductor) on a picosecond timescale but do not act directly on localized spin system. We show that the energy ... More
Summary and Outlook of the International Workshop on Aging Phenomena in Gaseous Detectors (DESY, Hamburg, October, 2001)Apr 04 2002High Energy Physics experiments are currently entering a new era which requires the operation of gaseous particle detectors at unprecedented high rates and integrated particle fluxes. Full functionality of such detectors over the lifetime of an experiment ... More
Metallic proximity effect in ballistic graphene with resonant scatterersOct 13 2009We study the effect of resonant scatterers on the local density of states in a rectangular graphene setup with metallic leads. We find that the density of states in a vicinity of the Dirac point acquires a strong position dependence due to both metallic ... More
Transfer of entanglement from electrons to photons by optical selection rulesMar 29 2005Jul 08 2005The entanglement transfer from electrons localized in a pair of quantum dots to circularly polarized photons is governed by optical selection rules, enforced by conservation of angular momentum. We point out that the transfer can not be achieved by means ... More
Can mesoscopic fluctuations reverse the supercurrent through a disordered Josephson junction?Jun 01 2001We calculate the Josephson coupling energy $U_J(\phi)$ (related to the supercurrent $I=(2e/\hbar) dU_J/d\phi$) for a disordered normal metal between two superconductors with a phase difference $\phi$. We demonstrate that the symmetry of the scattering ... More
Enhancement of the electric dipole moment of the electron in BaF moleculeJul 10 1997We report results of ab initio calculation of the spin-rotational Hamiltonian parameters including P- and P,T-odd terms for the BaF molecule. The ground state wave function of BaF molecule is found with the help of the Relativistic Effective Core Potential ... More
Renormalisation Group Corrections to Neutrino Mixing Sum RulesAug 30 2016Nov 25 2016Neutrino mixing sum rules are common to a large class of models based on the (discrete) symmetry approach to lepton flavour. In this approach the neutrino mixing matrix $U$ is assumed to have an underlying approximate symmetry form $\tilde{U}_{\nu}$, ... More
Renormalisation Group Corrections to Neutrino Mixing Sum RulesAug 30 2016Neutrino mixing sum rules are common to a large class of models based on the (discrete) symmetry approach to lepton flavour. In this approach the neutrino mixing matrix $U$ is assumed to have an underlying approximate symmetry form $\tilde{U}_{\nu}$, ... More
Recent VLBA/VERA/IVS Tests of General RelativityDec 17 2009We report on recent VLBA/VERA/IVS observational tests of General Relativity. First, we will summarize the results from the 2005 VLBA experiment that determined gamma with an accuracy of 0.0003 by measuring the deflection of four compact radio sources ... More
Electrostatic confinement of electrons in an integrable graphene quantum dotFeb 26 2009Jun 10 2009We compare the conductance of an undoped graphene sheet with a small region subject to an electrostatic gate potential for the cases that the dynamics in the gated region is regular (disc-shaped region) and classically chaotic (stadium). For the disc, ... More
Microscopic theory of spin-orbit torques and skyrmion dynamicsMar 25 2016Jan 25 2017We formulate a general microscopic approach to spin-orbit torques in thin ferromagnet/heavy-metal bilayers in linear response to electric current or electric field. The microscopic theory we develop avoids the notion of spin currents and spin-Hall effect. ... More
Dzyaloshinskii-Moriya interaction beyond Lifshitz invariantsApr 10 2019We consider the Dzyaloshinskii-Moriya interaction (DMI) in a generalized 2D Rashba ferromagnet. From electronic grand potential, we microscopically compute the micromagnetic energy density $w_D$ associated with DMI. We demonstrate that, even in the bulk ... More
Microscopic theory of spin-orbit torques applied to Skyrmion dynamicsMar 25 2016Spin-orbit torques of four different symmetries are related to a spin susceptibility tensor of linear response theory that is evaluated microscopically. The theory is applied to analyze Skyrmion dynamics induced by electric current in a ferromagnet/heavy-metal ... More
Resonant inverse Faraday effect in nanoringsAug 05 2015Dec 24 2015A circularly polarized light can induce a dissipationless dc current in a quantum nanoring which is responsible for a resonant helicity-driven contribution to magnetic moment. This current is not suppressed by thermal averaging despite its quantum nature. ... More
Excitation gap of a graphene channel with superconducting boundariesSep 25 2006We calculate the density of states of electron-hole excitations in a superconductor/normal-metal/superconductor (SNS) junction in graphene, in the long-junction regime that the superconducting gap is much larger than the Thouless energy. If the normal ... More
S-matrix poles for chaotic quantum systems as eigenvalues of complex symmetric random matrices: from isolated to overlapping resonancesJul 09 1998We study complex eigenvalues of large $N\times N$ symmetric random matrices of the form ${\cal H}=\hat{H}-i\hat{\Gamma}$, where both $\hat{H}$ and $\hat{\Gamma}$ are real symmetric, $\hat{H}$ is random Gaussian and $\hat{\Gamma}$ is such that $NTr \hat{\Gamma}^2_2\sim ... More
Neutrino nuclear response and photo nuclear reactionNov 10 2013Photo nuclear reactions are shown to be used for studying neutrino/weak nuclear responses involved in astro-neutrino nuclear interactions and double beta decays. Charged current weak responses for ground and excited states are studied by using photo nuclear ... More
Quasiparticle damping in two-dimensional superconductors with unconventional pairing.Mar 20 1995We calculate the damping of excitations due to four-fermionic interaction in the case of two-dimensional superconductor with nodes in the spectrum. At zero temperature and low frequencies it reveals gapless $\omega^3$ behavior at the nodal points. With ... More
Optimal spin-entangled electron-hole pair pumpFeb 02 2005Apr 19 2005A nonperturbative theory is presented for the creation by an oscillating potential of spin-entangled electron-hole pairs in the Fermi sea. In the weak potential limit, considered earlier by Samuelsson and Buttiker, the entanglement production is much ... More
Fokker-Planck equations and density of states in disordered quantum wiresNov 08 2000Jan 17 2001We propose a general scheme to construct scaling equations for the density of states in disordered quantum wires for all ten pure Cartan symmetry classes. The anomalous behavior of the density of states near the Fermi level for the three chiral and four ... More
Cross helicity sign reversals in the dissipative scales of magnetohydrodynamic turbulenceFeb 21 2019We perform direct numerical simulations of magnetohydrodynamic (MHD) turbulence with kinetic energy and cross helicity injections at large scales. We observe that the cross helicity changes sign as we go from large and intermediate scales to small scales. ... More
VLBI measurement of the secular aberration driftSep 20 2010Apr 12 2011While analyzing decades of very long baseline interferometry (VLBI) data, we detected the secular aberration drift of the extragalatic radio source proper motions caused by the rotation of the Solar System barycenter around the Galactic center. Our results ... More
Reentrance effect in a graphene n-p-n junction coupled to a superconductorApr 19 2007We study the interplay of Klein tunneling (= interband tunneling) between n-doped and p-doped regions in graphene and Andreev reflection (= electron-hole conversion) at a superconducting electrode. The tunneling conductance of an n-p-n junction initially ... More
Electric dipole moment of the electron in YbF moleculeMay 30 1998Ab initio calculation of the hyperfine, P-odd, and P,T-odd constants for the YbF molecule was performed with the help of the recently developed technique, which allows to take into account correlations and polarization in the outercore region. The ground ... More
On Some Adaptive Mirror Descent Algorithms for Convex and Strongly Convex Optimization Problems with Functional ConstraintsDec 18 2018In this paper some adaptive mirror descent algorithms for problems of minimization convex objective functional with several convex Lipschitz (generally, non-smooth) functional constraints are considered. It is shown that the methods are applicable to ... More
Coherent phi and omega meson photoproduction from deuteron and non-diffractive channelsJul 27 2002For coherent photoproduction of phi and omega mesons from deuteron at forward angles, the isovector pi-exchange amplitude is strongly suppressed. We show a possibility to study the non-diffractive channels associated with the unnatural parity exchange ... More
Predictions for the Leptonic Dirac CP Violation Phase: a Systematic Phenomenological AnalysisApr 02 2015Nov 08 2015We derive predictions for the Dirac phase $\delta$ present in the $3\times 3$ unitary neutrino mixing matrix $U = U_e^{\dagger} \, U_{\nu}$, where $U_e$ and $U_{\nu}$ are $3\times 3$ unitary matrices which arise from the diagonalisation, respectively, ... More
Radiation Damage and Long-Term Aging in Gas DetectorsMar 09 2004Mar 17 2004Aging phenomena constitute one of the most complex and serious potential problems which could limit, or severely impair, the use of gaseous detectors in unprecedented harsh radiation environments. Long-term operation in high-intensity experiments of the ... More
Systematic effects in apparent proper motion of radio sourcesMay 08 2008The galactocentric rotation of the Solar system generates the systematic effect in proper motions known as 'secular aberration drift'. This tiny effect (about five microseconds per year) in the quasar proper motion can be measured by VLBI. However, the ... More
The Secular Aberration Drift and Future Challenges for VLBI AstrometryJan 03 2013The centrifugial acceleration of the Solar system, resulting from the gravitational attraction of the Galaxy centre, causes a phenomenon known as 'secular aberrration drift'. This acceleration of the Solar system barycentre has been ignored so far in ... More
One method of storing informationSep 09 2010Formulate the problem as follows. Split a file into n pieces so that it can be restored without any m parts (1<=m<=n). Such problems are called problems secret sharing. There exists a set of methods for solving such problems, but they all require a fairly ... More
Secular Aberration Drift and IAU Definition of ICRSAug 27 2010The gravitational attraction of the Galactic centre leads to the centrifugal acceleration of the Solar system barycentre. It results in secular aberration drift which displaces the position of the distant radio sources. The effect should be accounted ... More
Systematic effects in the radio source proper motionJun 26 2009Some models of the expanding Universe predict that the astrometric proper motion of distant radio sources embedded in space-time are non-zero as radial distance from observer to the source grows. Systematic effects due to this proper motion can even increase ... More
Proper motion of reference radio sourcesApr 09 2008Apr 07 2009The motion of relativistic jets from the active extragalactic nuclei can reach several hundred microseconds per year and mimic proper motion of the distant radio sources observed by VLBI. Such motion of individual quasar is not correlated and its magnitude ... More
SUSY Multilepton Signatures at TevatronFeb 10 2007One of the most striking signature of supersymmetric models with electroweak symmetry breaking is the presence of multilepton event topologies in the decay products. In this paper searches are presented for physics beyond the Standard Model (SM) in final ... More
$φN$ photoproduction coupled with the $KΛ^*$ channelOct 25 2013We present in this talk a recent investigation on $\phi$ photoproduction, emphasizing the rescattering effects of the $K\Lambda^*$ channel near the threshold region. We discuss the results of the differential cross section and the angular distributions. ... More
New Developments and Future Perspectives of Gaseous DetectorsJun 24 2007Gaseous detectors are fundamental components of all present and planned high energy physics experiments. Over the past decade two representatives (GEM, Micromegas) of the Micro-Pattern Gas Detector (MPGD) concept have become increasingly important; the ... More
Search for Leptoquarks and Compositeness at D0Dec 03 2005In this paper searches are presented for the pair production of first and second generation scalar leptoquarks and limits are given on the quark-lepton compositeness scale from proton-antiproton collision data at a center-of-mass energy 1.96 TeV, collected ... More
Generalized Mirror Prox: Solving Variational Inequalities with Monotone Operator, Inexact Oracle, and Unknown Hölder ParametersJun 13 2018We introduce an inexact oracle model for variational inequalities (VI) with monotone operator, propose a numerical method which solves such VI's and analyze its convergence rate. As a particular case, we consider VI's with H\"older continuous operator ... More
Slip-Back Mapping as a Tracker of Topological Changes in Evolving Magnetic ConfigurationsMay 03 2019May 21 2019The topology of the coronal magnetic field produces a strong impact on the properties of the solar corona and presumably on the origin of the slow solar wind. To advance our understanding of this impact, we revisit the concept of so-called slip-back mapping ... More
Perspectives of Micro-Pattern Gaseous Detector Technologies for Future Physics ProjectsAug 14 2013Aug 15 2013A centenary after the invention of the basic principle of gas amplification, gaseous detectors - are still the first choice whenever the large area coverage with low material budget is required. Advances in photo-lithography and micro-processing techniques ... More
Gaseous Detectors: recent developments and applicationsAug 23 2010Aug 24 2010Since long time, the compelling scientific goals of future high energy physics experiments were a driving factor in the development of advanced detector technologies. A true innovation in detector instrumentation concepts came in 1968, with the development ... More
Spin-torque resonance due to diffusive dynamics at a surface of topological insulatorOct 13 2018Feb 27 2019We investigate spin-orbit torques on magnetization in an insulating ferromagnetic (FM) layer that is brought into a close proximity to a topological insulator (TI). In addition to the well-known field-like spin-orbit torque, we identify an anisotropic ... More
Coulomb drag in graphene near the Dirac pointMay 22 2012Jun 02 2012We study Coulomb drag in double-layer graphene near the Dirac point. A particular emphasis is put on the case of clean graphene, with transport properties dominated by the electron-electron interaction. Using the quantum kinetic equation framework, we ... More
From Anderson to anomalous localization in cold atomic gases with effective spin-orbit couplingJun 29 2011Feb 23 2012We study the dynamics of a one-dimensional spin-orbit coupled Schrodinger particle with two internal components moving in a random potential. We show that this model can be implemented by the interaction of cold atoms with external lasers and additional ... More
The electronic structure formation of CuxTiSe2 in a wide range (0.04 < x < 0.8) of copper concentrationSep 10 2015An experimental study of the electronic structure of copper intercalated titanium dichalcogenides in a wide range of copper concentrations (x = 0.05 - 0.6) using the x-rays photoemission spectroscopy, resonant photoemission and x-rays absorption spectroscopy ... More
Hydrodynamics in graphene: Linear-response transportNov 04 2014We develop a hydrodynamic description of transport properties in graphene-based systems which we derive from the quantum kinetic equation. In the interaction-dominated regime, the collinear scattering singularity in the collision integral leads to fast ... More
Coulomb drag in graphene: perturbation theoryOct 28 2011Jan 20 2012We study the effect of Coulomb drag between two closely positioned graphene monolayers. In the limit of weak electron-electron interaction and small inter-layer spacing ($\mu_{1(2)}, T\ll v/d$) the drag is described by a universal function of the chemical ... More
Charge transport in graphene with resonant scatterersAug 26 2009Feb 08 2010The full counting statistics for the charge transport through an undoped graphene sheet in the presence of strong potential impurities is studied. Treating the scattering off the impurity in the s-wave approximation, we calculate the impurity correction ... More
Lévy flights due to anisotropic disorder in grapheneApr 26 2016Jul 02 2016We study transport properties of graphene with anisotropically distributed on-site impurities (adatoms) that are randomly placed on every third line drawn along carbon bonds. We show that stripe states characterized by strongly suppressed back-scattering ... More
Aging Studies of Large Area Proportional Chambers under High-Rate Irradiation with $CF_4$-based Mixtures (Part 2)Nov 23 2001Experimental conditions at the HERA-B experiment impose very strong requirements for gaseous detectors. The charged particle fluxes through the HERA-B tracking system, varying with the radial distance R from the beam line, are about $2 \times 10^{7}/R^{2}$ ... More
Diffusion and criticality in undoped graphene with resonant scatterersJun 16 2010A general theory is developed to describe graphene with arbitrary number of isolated impurities. The theory provides a basis for an efficient numerical analysis of the charge transport and is applied to calculate the minimal conductivity of graphene with ... More
Sensitivity of anomalous Hall effect to disorder correlationsOct 25 2017Both longitudinal and anomalous Hall conductivity are computed in the model of two-dimensional Dirac fermions with a mass in the presence of arbitrary correlated weak disorder. The anomalous Hall conductivity is shown to be highly sensitive to the correlation ... More
Collision-dominated nonlinear hydrodynamics in grapheneJul 31 2015We present an effective hydrodynamic theory of electronic transport in graphene in the interaction-dominated regime. We derive the emergent hydrodynamic description from the microscopic Boltzmann kinetic equation taking into account dissipation due to ... More
Spin filters with Fano dotsJan 27 2004We compute the zero bias conductance of electrons through a single ballistic channel weakly coupled to a side quantum dot with Coulomb interaction. In contrast to the standard setup which is designed to measure the transport through the dot, the channel ... More
Quantum Hall criticality and localization in graphene with short-range impurities at the Dirac pointJun 24 2013Dec 17 2013We explore the longitudinal conductivity of graphene at the Dirac point in a strong magnetic field with two types of short-range scatterers: adatoms that mix the valleys and "scalar" impurities that do not mix them. A scattering theory for the Dirac equation ... More
Resonant photoemission at the absorption edge of Mn and Ti and electronic structure of 1T-Mn$_{0.2}$TiSe$_2$Jan 11 2011Nov 07 2011Resonant valence-band X-ray photoelectron spectra (ResPES) excited near 2p$_{3/2}$ core level energies, 2p X-ray photoelectron spectra (XPS) and L$_{3,2}$ X-ray absorption spectra (XAS) of Ti and Mn in single crystal of 1T-Mn$_2$TiSe$_2$ were studied ... More
Plasmonic shock waves and solitons in a nanoringJun 20 2016Sep 26 2016We apply the hydrodynamic theory of electron liquid to demonstrate that a circularly polarized radiation induces the diamagnetic, helicity-sensitive dc current in a ballistic nanoring. This current is dramatically enhanced in the vicinity of plasmonic ... More
Anomalous Hall effect with massive Dirac fermionsApr 14 2015Jul 29 2015Anomalous Hall effect arises in systems with both spin-orbit coupling and magnetization. Generally, there are three mechanisms contributing to anomalous Hall conductivity: intrinsic, side jump, and skew scattering. The standard diagrammatic approach to ... More
Color-dependent conductance of graphene with adatomsNov 17 2010We study ballistic transport properties of graphene with a low concentration of vacancies or adatoms. The conductance of graphene doped to the Dirac point is found to depend on the relative distribution of impurities among different sites of the honeycomb ... More
Aging Studies of Large Area Proportional Chambers under High-Rate Irradiation with $CF_4$-based Mixtures (PART 1)Nov 23 2001Experimental conditions at the HERA-B experiment impose very strong requirements for gaseous detectors. The charged particle fluxes through the HERA-B tracking system, varying with the radial distance $R$ from the beam line, are about $2 \times 10^{7}/R^{2}$ ... More
Anomalous Hall effect in 2D Rashba ferromagnetNov 23 2015Dec 11 2015Skew scattering on rare impurity configurations is shown to dominate the anomalous Hall effect in a 2D Rashba ferromagnet. The mechanism originates in scattering on rare impurity pairs separated by distances of the order of the Fermi wave length. Corresponding ... More
GPU Acceleration of an Established Solar MHD Code using OpenACCNov 06 2018GPU accelerators have had a notable impact on high-performance computing across many disciplines. They provide high performance with low cost/power, and therefore have become a primary compute resource on many of the largest supercomputers. Here, we implement ... More
Quantum-limited shot noise in grapheneMar 11 2006Apr 10 2006We calculate the mode-dependent transmission probability of massless Dirac fermions through an ideal strip of graphene (length L, width W, no impurities or defects), to obtain the conductance and shot noise as a function of Fermi energy. We find that ... More
Optical Spectra of Candidate Southern Hemisphere International Celestial Reference Frame (ICRF) radio sourcesSep 06 2011We present the results of spectroscopic observations of the optical counterparts of 47 southern radio sources from the candidate International Celestial Reference Catalogue (ICRC), as part of a Very Long Baseline Interferometry (VLBI) program to strengthen ... More
Readout of GEM Detectors Using the Medipix2 CMOS Pixel ChipNov 23 2006We have operated a Medipix2 CMOS readout chip, with amplifying, shaping and charge discriminating front-end electronics integrated on the pixel-level, as a highly segmented direct charge collecting anode in a three-stage gas electron multiplier (Triple-GEM) ... More
Dynamic effect of phase conjugation on wave localizationOct 19 2001We investigate what would happen to the time dependence of a pulse reflected by a disordered single-mode waveguide, if it is closed at one end not by an ordinary mirror but by a phase-conjugating mirror. We find that the waveguide acts like a virtual ... More
How spin-orbit interaction can cause electronic shot noiseMar 20 2006The shot noise in the electrical current through a ballistic chaotic quantum dot with N-channel point contacts is suppressed for N --> infinity, because of the transition from stochastic scattering of quantum wave packets to deterministic dynamics of ... More
Effects of pressure-induced phase transitions on superconductivity in the single crystal Fe1.02SeMay 20 2009May 22 2009The temperature dependence of the ac susceptibility for single-crystalline Fe1.02Se has been measured at high pressures to 6.7 GPa. The superconducting transition temperature Tc displays a large increase from 7 K to 30 K in the two-phase region at 0.5 ... More
Asymmetric and symmetric exchange in a generalized 2D Rashba ferromagnetApr 10 2018Feb 18 2019Dzyaloshinskii-Moriya interaction (DMI) is investigated in a 2D ferromagnet (FM) with spin-orbit interaction of Rashba type at finite temperatures. The FM is described in the continuum limit by an effective $s$-$d$ model with arbitrary dependence of spin-orbit ... More
Evolution of electronic structure on Transition Metal doped Titanium Disulfide by angle-resolved photoemission spectroscopy studyAug 06 2010Aug 24 2010We have systematically investigated the structural property and electrical structures of the transition metal intercalated titanium disulfide compound Fe$_x$TiS$_2$ ($0\leq x\leq0.33$) from angle-resolved photoelectron spectroscopy with tunable polarized ... More