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Localization of Two Interacting Particles in One-Dimensional Random
Potential: We investigate the localization of two interacting particles in
one-dimensional random potential. Our definition of the two-particle
localization length, $\xi$, is the same as that of v. Oppen et al. [Phys. Rev.
Lett. 76, 491 (1996)] and $... | cond-mat_mes-hall |
Floquet engineering of lattice structure and dimensionality in twisted
moiré heterobilayers: We present an experimental proposal to tune the effective lattice structure
in twisted transition metal dichalcogenide (TMD) heterobilayers with
time-periodic Floquet drive. We show that elliptically polarized light with
sub-... | cond-mat_mes-hall |
Signatures of Majorana fermions in hybrid superconductor-semiconductor
nanowire devices: Majorana fermions are particles identical to their own antiparticles. They
have been theoretically predicted to exist in topological superconductors. We
report electrical measurements on InSb nanowires contacted with one normal (... | cond-mat_mes-hall |
Spin dynamics in InAs-nanowire quantum-dots coupled to a transmission
line: We study theoretically electron spins in nanowire quantum dots placed inside
a transmission line resonator. Because of the spin-orbit interaction, the spins
couple to the electric component of the resonator electromagnetic field and
enable co... | cond-mat_mes-hall |
Spin superfluidity and long-range transport in thin-film ferromagnets: In ferromagnets, magnons may condense into a single quantum state. Analogous
to superconductors, this quantum state may support transport without
dissipation. Recent works suggest that longitudinal spin transport through a
thin-film ferromagnet is a... | cond-mat_mes-hall |
Gate-control of spin-motive force and spin-torque in Rashba SOC systems: The introduction of a strong Rashba spin orbit coupling (SOC) had been
predicted to enhance the spin motive force (SMF) [see Phys. Rev. Lett. {\bf
108}, 217202 (2012)]. In this work, we predict further enhancement of the SMF
by time modulation of ... | cond-mat_mes-hall |
Spiral orientational order in quantum Hall skyrmion lattices: We investigate the existence of spiral ordering in the planar spin
orientation of skyrmions localised on a face centered rectangular lattice
(FCRL). We use the non-linear sigma model (NLSM) to numerically calculate the
minimum energy configurations of this l... | cond-mat_mes-hall |
Low frequency Raman studies of multi-wall carbon nanotubes: experiments
and theory: In this paper, we investigate the low frequency Raman spectra of multi-wall
carbon nanotubes (MWNT) prepared by the electric arc method. Low frequency
Raman modes are unambiguously identified on purified samples thanks to the
small in... | cond-mat_mes-hall |
Optical properties of the Hofstadter butterfly in the Moiré
superlattice: We investigate the optical absorption spectrum and the selection rule for the
Hofstadter butterfly in twisted bilayer graphene under magnetic fields. We
demonstrate that the absorption spectrum exhibits a self-similar recursive
pattern reflecti... | cond-mat_mes-hall |
Two components of donor-acceptor recombination in compensated
semiconductors. Analytical model of spectra in presence of electrostatic
fluctuations: We report numerical and analytical studies of the donor-acceptor
recombination in compensated semiconductors. Our calculations take into account
random electric fields... | cond-mat_mes-hall |
Asymptotic Expressions for Charge Matrix Elements of the Fluxonium
Circuit: In charge-coupled circuit QED systems, transition amplitudes and dispersive
shifts are governed by the matrix elements of the charge operator. For the
fluxonium circuit, these matrix elements are not limited to nearest-neighbor
energy levels ... | cond-mat_mes-hall |
Scanning Tunneling Microscopy and Spectroscopy of Graphene on Insulating
Substrates: Graphene is a truly two-dimensional material with exceptional electronic,
mechanical, and optical properties. As such, it consists of surface only and
can be probed by the well developed surface-science techniques as, e.g.,
scanning ... | cond-mat_mes-hall |
Rectification in mesoscopic AC-gated semiconductor devices: We measure the rectified dc currents resulting when a 3-terminal
semiconductor device with gate-dependent conductance is driven with an ac gate
voltage. The rectified currents exhibit surprisingly complex behaviour as the
dc source-drain bias voltage, the dc g... | cond-mat_mes-hall |
Nonequilibrium edge transport in quantum Hall based Josephson junctions: We study the transport properties of a voltage-biased Josephson junction
where the BCS superconducting leads are coupled via the edges of a quantum Hall
sample. In this scenario, an out of equilibrium Josephson current develops,
which is numerical... | cond-mat_mes-hall |
Josephson Current in Ballistic Graphene Corbino Disk: We solve Dirac-Bogoliubov-De-Gennes (DBdG) equation in a
superconductor-normal graphene superconductor (SGS) junction with Corbino disk
structure to investigate the Josephson current through this junction. We find
that the critical current $I_c$ has a nonzero value ... | cond-mat_mes-hall |
Charge to Magnetic Flux Ratios: It is shown that if the carriers in the fractional quantum Hall effect are
taken as geometrical excitations with quanta of charge e and magnetic flux
h/2e, as proposed in a previous publication, the calculated results are
compatible with the series of fractions obtained experimentally. | cond-mat_mes-hall |
Homogenization of Rough Surfaces: Effective Surface Stress and
Superficial Elasticity: Relating microstructure to properties, electromagnetic, mechanical, thermal
and their couplings has been a major focus of mechanics, physics and materials
science. The majority of the literature focuses on deriving homogenized
cons... | cond-mat_mes-hall |
Magnetic catalysis and axionic charge-density-wave in Weyl semimetals: Three-dimensional Weyl and Dirac semimetals can support a
chiral-symmetry-breaking, fully gapped, charge-density-wave order even for
sufficiently weak repulsive electron-electron interactions, when placed in
strong magnetic fields. In the former sys... | cond-mat_mes-hall |
Nearly flat bands in twisted triple bilayer graphene: We investigate the electronic structure of alternating-twist triple
Bernal-stacked bilayer graphene (t3BG) as a function of interlayer coupling
$\omega$, twist angle $\theta$, interlayer potential difference $\Delta$, and
top-bottom bilayers sliding vector $\boldsym... | cond-mat_mes-hall |
Current induced and interaction driven Dirac-point drag of massless
quasi-relativistic fermions: We study the quasiparticle properties of two-dimensional massless Dirac
Fermions when the many-body states possess a finite momentum density in the
clean limit. The lack of Galilean invariance endows the many-body states ... | cond-mat_mes-hall |
Acoustic phonon dynamics in thin-films of the topological insulator
Bi2Se3: Transient reflectivity traces measured for nanometer-sized films of the
topological insulator Bi2Se3 revealed GHz-range oscillations driven within the
relaxation of hot carriers photoexcited with ultrashort laser pulses of 1.51 eV
photon ener... | cond-mat_mes-hall |
Strain impacts on commensurate bilayer graphene superlattices: distorted
trigonal warping, emergence of bandgap and direct-indirect bandgap transition: Due to low dimensionality, the controlled stacking of the graphene films and
their electronic properties are susceptible to environmental changes including
strain. Th... | cond-mat_mes-hall |
Electromagnetic properties of a double layer graphene system with
electron-hole pairing: We study electromagnetic properties of a double layer graphene system in
which electrons from one layer are coupled with holes from the other layer. The
gauge invariant linear response functions are obtained. The frequency
depend... | cond-mat_mes-hall |
Direct surface charging and alkali-metal doping for tuning the
interlayer magnetic order in planar nanostructures: The continuous reduction of magnetic units to ultra small length scales
inspires efforts to look for a suitable means of controlling magnetic states.
In this study we show two surface charge alteration t... | cond-mat_mes-hall |
Fast preparation of single hole spin in InAs/GaAs quantum dot in Voigt
geometry magnetic field: The preparation of a coherent heavy-hole spin via ionization of a
spin-polarized electron-hole pair in an InAs/GaAs quantum dot in a Voigt
geometry magnetic field is investigated. For a dot with a 17 ueV bright-exciton
fin... | cond-mat_mes-hall |
Evaluation of Spin Waves and Ferromagnetic Resonance Contribution to the
Spin Pumping in Ta/CoFeB Structure: The spin waves and ferromagnetic resonance (FMR) contribution to the spin
pumping signal is studied in the Ta/CoFeB interface under different excitation
bias fields. Ferromagnetic resonance is excited utilizin... | cond-mat_mes-hall |
Continuous microwave hole burning and population oscillations in a
diamond spin ensemble: Continuous spectral hole burning and spin-level population oscillations are
studied in an inhomogeneously broadened diamond-based spin ensemble composed of
substitutional nitrogen and nitrogen-vacancy centres created through neu... | cond-mat_mes-hall |
Interface traps in graphene field effect devices: extraction methods and
influence on characteristics: We study impact of the near-interfacial oxide traps on the C-V and I-V
characteristics of graphene gated structures. Methods of extraction of
interface trap level density in graphene field effect devices from the
ca... | cond-mat_mes-hall |
Pseudospin, velocity and Berry phase in a bilayer graphene: Hamiltonian and eigenstate problem is formulated for a bilayer graphene in
terms of Clifford's geometric algebra \textit{Cl}$_{3,1}$. It is shown that
such approach allows to perform analytical calculations in a simple way if
geometrical algebra rotors are use... | cond-mat_mes-hall |
Chiral magnetic effect at finite temperature in a field-theoretic
approach: We investigate the existence (or lack thereof) of the chiral magnetic effect
in the framework of finite temperature field theory, studied through the path
integral approach and regularized via the zeta function technique. We show
that, indepe... | cond-mat_mes-hall |
Relation between spin Hall effect and anomalous Hall effect in 3$d$
ferromagnetic metals: We study the mechanisms of the spin Hall effect (SHE) and anomalous Hall
effect (AHE) in 3$d$ ferromagnetic metals (Fe, Co, permalloy
(Ni$_{81}$Fe$_{19}$; Py), and Ni) by varying their resistivities and
temperature. At low tempe... | cond-mat_mes-hall |
Minimal models for nonreciprocal amplification using biharmonic drives: We present a generic system of three harmonic modes coupled parametrically
with a time-varying coupling modulated by a combination of two pump harmonics,
and show how this system provides the minimal platform to realize nonreciprocal
couplings that... | cond-mat_mes-hall |
Microwave-induced magnetoresistance of two-dimensional electrons
interacting with acoustic phonons: The influence of electron-phonon interaction on magnetotransport in
two-dimensional electron systems under microwave irradiation is studied
theoretically. Apart from the phonon-induced resistance oscillations which
exi... | cond-mat_mes-hall |
Transport properties and electrical device characteristics with the
TiMeS computational platform: application in silicon nanowires: Nanoelectronics requires the development of a priori technology evaluation
for materials and device design that takes into account quantum physical
effects and the explicit chemical natu... | cond-mat_mes-hall |
Symmetry dictated universal helicity redistribution of Dirac fermions in
transport: Helicity is a fundamental property of Dirac fermions. Yet, the general rule
of how it changes in transport is still lacking. We uncover, theoretically, the
universal spinor state transformation and consequently helicity redistribution... | cond-mat_mes-hall |
Composite Fermions with a Warped Fermi Contour: Via measurements of commensurability features near Landau filling factor
$\nu=1/2$, we probe the shape of the Fermi contour for hole-flux composite
fermions confined to a wide GaAs quantum well. The data reveal that the
composite fermions are strongly influenced by the ch... | cond-mat_mes-hall |
Signatures of folded branches in the scanning gate microscopy of
ballistic electronic cavities: We demonstrate the emergence of classical features in electronic quantum
transport for the scanning gate microscopy response in a cavity defined by a
quantum point contact and a micron-sized circular reflector. The branche... | cond-mat_mes-hall |
Spectroscopy of double quantum dot two-spin states by tuning the
inter-dot barrier: Transport spectroscopy of two-spin states in a double quantum dot can be
performed by an AC electric field which tunes the energy detuning. However, a
problem arises when the transition rate between the states is small and,
consequent... | cond-mat_mes-hall |
Proximity DC squids in the long junction limit: We report the design and measurement of
Superconducting/normal/superconducting (SNS) proximity DC squids in the long
junction limit, i.e. superconducting loops interrupted by two normal metal
wires roughly a micrometer long. Thanks to the clean interface between the
metal... | cond-mat_mes-hall |
Interaction effects on thermal transport in quantum wires: We develop a theory of thermal transport of weakly interacting electrons in
quantum wires. Unlike higher-dimensional systems, a one-dimensional electron
gas requires three-particle collisions for energy relaxation. The fastest
relaxation is provided by the intr... | cond-mat_mes-hall |
Spin Coulomb drag by non-equilibrium magnetic textures: Interaction between local magnetization and conduction electrons is
responsible for a variety of phenomena in magnetic materials. We have shown
that the spin-dependent motive force induced by magnetization dynamics in a
conducting ferromagnet lead to the spin Coul... | cond-mat_mes-hall |
Single ion implantation for single donor devices using Geiger mode
detectors: Electronic devices that are designed to use the properties of single atoms
such as donors or defects have become a reality with recent demonstrations of
donor spectroscopy, single photon emission sources, and magnetic imaging using
defect c... | cond-mat_mes-hall |
Dynamical Lamb Effect in a Tunable Superconducting Qubit-Cavity System: A natural atom placed into a cavity with time-dependent parameters can be
parametrically excited due to the interaction with the quantized photon mode.
One of the channels of such a process is the dynamical Lamb effect, induced by
a nonadiabatic mo... | cond-mat_mes-hall |
All-optical hyperpolarization of electron and nuclear spins in diamond: Low thermal polarization of nuclear spins is a primary sensitivity limitation
for nuclear magnetic resonance. Here we demonstrate optically pumped
(microwave-free) nuclear spin polarization of $^{13}\mathrm{C}$ and
$^{15}\mathrm{N}$ in $^{15}\mathr... | cond-mat_mes-hall |
Many-body approach to non-Hermitian physics in fermionic systems: In previous studies, the topological invariants of 1D non-Hermitian systems
have been defined in open boundary condition (OBC) to satisfy the bulk-boundary
correspondence. The extreme sensitivity of bulk energy spectra to boundary
conditions has been att... | cond-mat_mes-hall |
Equilibrium current vortices in rare-earth-doped simple metals: Dilute alloys of rare earths have played a vital role in understanding
magnetic phenomena. Here, we model the ground state of dilute 4f rare-earth
impurities in light metals. When the 4f subshells are open (but not
half-filled), the spin-orbit coupling imp... | cond-mat_mes-hall |
Current-controlled light scattering and asymmetric plasmon propagation
in graphene: We demonstrate that plasmons in graphene can be manipulated using a DC
current. A source-drain current lifts the forward/backward degeneracy of the
plasmons, creating two modes with different propagation properties parallel and
antipa... | cond-mat_mes-hall |
Particle-Flux Separation and Quasiexcitations in Quantum Hall Systems: The quasiexcitations of quantum Hall systems at the filling factor $\nu =
p/(2pq \pm 1)$ are studied in terms of chargeon and fluxon introduced
previously as constituents of an electron at $\nu = 1/2$. At temperatures $T <
T_{\rm PFS}(\nu)$, the phe... | cond-mat_mes-hall |
Percolation via combined electrostatic and chemical doping in complex
oxide films: Stimulated by experimental advances in electrolyte gating methods, we
investigate theoretically percolation in thin films of inhomogenous complex
oxides, such as La$_{1-x}$Sr$_{x}$CoO$_{3}$ (LSCO), induced by a combination of
bulk chem... | cond-mat_mes-hall |
Quantum criticality in a double quantum-dot system: We discuss the realization of the quantum-critical non-Fermi liquid state,
originally discovered within the two-impurity Kondo model, in double
quantum-dot systems. Contrary to the common belief, the corresponding fixed
point is robust against particle-hole and variou... | cond-mat_mes-hall |
Scaling analysis of Kondo screening cloud in a mesoscopic ring with an
embedded quantum dot: The Kondo effect is theoretically studied in a quantum dot embedded in a
mesoscopic ring. The ring is connected to two external leads, which enables the
transport measurement. Using the "poor man's" scaling method, we obtain
... | cond-mat_mes-hall |
Collective modes in interacting two-dimensional tomographic Fermi
liquids: We develop an analytically solvable model for interacting two-dimensional
Fermi liquids with separate collisional relaxation rates for parity-odd and
parity-even Fermi surface deformations. Such a disparity of collisional
lifetimes exists when... | cond-mat_mes-hall |
Spin-orbit induced longitudinal spin-polarized currents in non-magnetic
solids: For certain non-magnetic solids with low symmetry the occurrence of
spin-polarized longitudinal currents is predicted. These arise due to an
interplay of spin-orbit interaction and the particular crystal symmetry. This
result is derived u... | cond-mat_mes-hall |
Friedel oscillations induced by magnetic skyrmions: from scattering
properties to all-electrical detection: Magnetic skyrmions are spin swirling solitonic defects that can play a major
role in information technology. Their future in applications and devices hinges
on their efficient manipulation and detection. Here, ... | cond-mat_mes-hall |
Cotunneling renormalization in carbon nanotube quantum dots: We determine the level-shifts induced by cotunneling in a Coulomb blockaded
carbon nanotube quantum dot using leading order quasi-degenerate perturbation
theory within a single nanotube quartet. It is demonstrated that otherwise
degenerate and equally tunnel-... | cond-mat_mes-hall |
Electrically controlling single spin qubits in a continuous microwave
field: Large-scale quantum computers must be built upon quantum bits that are both
highly coherent and locally controllable. We demonstrate the quantum control of
the electron and the nuclear spin of a single 31P atom in silicon, using a
continuous... | cond-mat_mes-hall |
Strong influence of spin-orbit coupling on magnetotransport in
two-dimensional hole systems: With a view to electrical spin manipulation and quantum computing
applications, recent significant attention has been devoted to semiconductor
hole systems, which have very strong spin-orbit interactions. However,
experimenta... | cond-mat_mes-hall |
Detection of finite frequency photo-assisted shot noise with a resonant
circuit: Photo-assisted transport through a mesoscopic conductor occurs when an
oscillatory (AC) voltage is superposed to the constant (DC) bias which is
imposed on this conductor. Of particular interest is the photo assisted shot
noise, which ha... | cond-mat_mes-hall |
Composite Fermions in Negative Effective Magnetic Field: A Monte-Carlo
Study: The method of Jain and Kamilla [PRB {\bf 55}, R4895 (1997)] allows numerical
generation of composite fermion trial wavefunctions for large numbers of
electrons in high magnetic fields at filling fractions of the form nu=p/(2mp+1)
with m and... | cond-mat_mes-hall |
Charge trapping in the system of interacting quantum dots: We analyzed the localized charge dynamics in the system of $N$ interacting
single-level quantum dots (QDs) coupled to the continuous spectrum states in
the presence of Coulomb interaction between electrons within the dots.
Different dots geometry and initial ch... | cond-mat_mes-hall |
Low Temperature Nanoscale Electronic Transport on the MoS_2 surface: Two-probe electronic transport measurements on a Molybdenum Disulphide
(MoS_2) surface were performed at low temperature (30K) under ultra-high vacuum
conditions. Two scanning tunneling microscope tips were precisely positioned in
tunneling contact to... | cond-mat_mes-hall |
Crystalline Polymers with Exceptionally Low Thermal Conductivity Studied
using Molecular Dynamics: Semi-crystalline polymers have been shown to have greatly increased thermal
conductivity compared to amorphous bulk polymers due to effective heat
conduction along the covalent bonds of the backbone. However, the mechan... | cond-mat_mes-hall |
Structural and Electrical Characterization of Bi2Se3 Nanostructures
Grown by Metalorganic Chemical Vapor Deposition: We characterize nanostructures of Bi2Se3 that are grown via metalorganic
chemical vapor deposition using the precursors diethyl selenium and trimethyl
bismuth. By adjusting growth parameters, we obtain... | cond-mat_mes-hall |
Transport Mean Free Path for Magneto-Transverse Light Diffusion: We derive an expression for the transport mean free path $\ell^*_\perp$
associated with magneto-transverse light diffusion for a random collection of
Faraday-active
Mie scatterers. This expression relates the magneto-transverse diffusion in
multiple sca... | cond-mat_mes-hall |
Coherent Phonons in Carbon Nanotubes and Graphene: We review recent studies of coherent phonons (CPs) corresponding to the
radial breathing mode (RBM) and G-mode in single-wall carbon nanotubes (SWCNTs)
and graphene. Because of the bandgap-diameter relationship, RBM-CPs cause
bandgap oscillations in SWCNTs, modulating ... | cond-mat_mes-hall |
Stark effect and generalized Bloch-Siegert shift in a strongly driven
two-level system: A superconducting qubit was driven in an ultrastrong fashion by an
oscillatory microwave field, which was created by coupling via the nonlinear
Josephson energy. The observed Stark shifts of the `atomic' levels are so
pronounced t... | cond-mat_mes-hall |
Near-field thermal transport between twisted bilayer graphene: Active control of heat flow is of both fundamental and applied interest in
thermal management and energy conversion. Here, we present a fluctuational
electrodynamic study of thermal radiation between twisted bilayer graphene
(TBLG), motivated by its unusual... | cond-mat_mes-hall |
Orbital Stark effect and quantum confinement transition of donors in
silicon: Adiabatic shuttling of single impurity bound electrons to gate induced
surface states in semiconductors has attracted much attention in recent times,
mostly in the context of solid-state quantum computer architecture. A recent
transport spe... | cond-mat_mes-hall |
Phonons and Thermal Conducting Properties of Borocarbonitride (BCN)
Nanosheets: Hexagonal borocarbonitrides (BCN) are a class of 2D materials, which display
excellent catalytic activity for water splitting. Here, we report analysis of
thermal stability, phonons and thermal conductivity of BCN monolayers over a
wide r... | cond-mat_mes-hall |
Sensitivity of the Power Spectra of Magnetization Fluctuations in Low
Barrier Nanomagnets to Barrier Height Modulation and Defects: Nanomagnets with small shape anisotropy energy barriers on the order of the
thermal energy have unstable magnetization that fluctuates randomly in time.
They have recently emerged as pro... | cond-mat_mes-hall |
Optical Kerr Effect in Graphene: Theoretical Analysis of the Optical
Heterodyne Detection Technique: Graphene is an atomically thin two-dimensional material demonstrating strong
optical nonlinearities including harmonics generation, four wave mixing, Kerr
and other nonlinear effects. In this paper we theoretically an... | cond-mat_mes-hall |
Decay and Frequency Shift of Inter and Intravalley Phonons in Graphene
-Dirac Cone Migration-: By considering analytical expressions for the self-energies of intervalley
and intravalley phonons in graphene, we describe the behavior of D, 2D, and
D$'$ Raman bands with changes in doping ($\mu$) and light excitation ene... | cond-mat_mes-hall |
Structure and energetics of carbon, hexagonal boron nitride and
carbon/hexagonal boron nitride single-layer and bilayer nanoscrolls: Single-layer and bilayer carbon and hexagonal boron nitride nanoscrolls as
well as nanoscrolls made of bilayer graphene/hexagonal boron nitride
heterostructure are considered. Structure... | cond-mat_mes-hall |
Bismuth antiphase domain wall: A three-dimensional manifestation of the
Su-Schrieffer-Heeger model: The Su, Schrieffer and Heeger (SSH) model, describing the soliton excitations
in polyacetylene due to the formation of antiphase domain walls (DW) from the
alternating bond pattern, has served as a paradigmatic example... | cond-mat_mes-hall |
Field electron emission theory (October 2016),v2: This document provides an updated account of material originally presented in
two field electron emission (FE) tutorial lectures given at the 2016 Young
Researchers' School in Vacuum Micro/Nano Electronics, held in Saint-Petersburg
in October 2016. The aim of the tutori... | cond-mat_mes-hall |
Phonon-bottleneck enhanced magnetic hysteresis in a molecular paddle
wheel complex of Ru$_2^{5+}$: The ruthenium based molecular magnet
[Ru$_2$(D(3,5-Cl$_2$Ph)F)$_4$Cl(0.5H$_2$O)$\cdotp$C$_6$H$_{14}$] (hereafter
Ru$_2$) behaves as a two-level system at sufficiently low temperatures. The
authors performed spin detecti... | cond-mat_mes-hall |
Spin Transfer Torque and Electric Current in Helical Edge States in
Quantum Spin Hall Devices: We study the dynamics of a quantum spin Hall edge coupled to a magnet with
its own dynamics. Using spin transfer torque principles, we analyze the
interplay between spin currents in the edge state and dynamics of the axis o... | cond-mat_mes-hall |
Spin Properties of Low Density One-Dimensional Wires: We report conductance measurements of a ballistic one-dimensional (1D) wire
defined in the lower two-dimensional electron gas of a GaAs/AlGaAs double
quantum well. At low temperatures there is an additional structure at
$0.7(2e^2/h)$ in the conductance, which tends ... | cond-mat_mes-hall |
Spin current generation due to differential rotation: We study nonequilibrium spin dynamics in differentially rotating systems,
deriving an effective Hamiltonian for conduction electrons in the comoving
frame. In contrast to conventional spin current generation mechanisms that
require vorticity, our theory describes sp... | cond-mat_mes-hall |
Wide-Band Tuneability, Nonlinear Transmission, and Dynamic
Multistability in SQUID Metamaterials: Superconducting metamaterials comprising rf SQUIDs (Superconducting QUantum
Interference Devices) have been recently realized and investigated with respect
to their tuneability, permeability and dynamic multistability pr... | cond-mat_mes-hall |
Kitaev spin models from topological nanowire networks: We show that networks of topological nanowires can realize the physics of
exactly solvable Kitaev spin models with two-body interactions. This connection
arises from the description of the low-energy theory of both systems in terms
of a tight-binding model of Major... | cond-mat_mes-hall |
Dissipation in graphene and nanotube resonators: Different damping mechanisms in graphene nanoresonators are studied: charges
in the substrate, ohmic losses in the substrate and the graphene sheet,
breaking and healing of surface bonds (Velcro effect), two level systems,
attachment losses, and thermoelastic losses. We ... | cond-mat_mes-hall |
Disorder induced Coulomb gaps in graphene constrictions with different
aspect ratios: We present electron transport measurements on lithographically defined and
etched graphene nanoconstrictions with different aspect ratios including
different lengths (L) and widths (W). A roughly length-independent disorder
induced ... | cond-mat_mes-hall |
Generation of hyper-entangled photon pairs in coupled microcavities: We propose and theoretically analyze a new scheme for generating
hyper-entangled photon pairs in a system of polaritons in coupled planar
microcavities. Starting from a microscopic model, we evaluate the relevant
parametric scattering processes and nu... | cond-mat_mes-hall |
Observation of drift and diffusion processes in Ti/TiOx/Ti memristive
devices prepared by local anodic oxidation: We demonstrate that memristive devices can be fabricated by tip-induced
oxidation of thin metallic films using atomic force microscope. Electrical
measurements of such prepared Ti/TiOx/Ti test structures ... | cond-mat_mes-hall |
Localized Many-Particle Majorana Modes with Vanishing Time-Reversal
Symmetry Breaking in Double Quantum Dots: We introduce the concept of spinful many-particle Majorana modes with local
odd operator products, thereby preserving their local statistics. We consider a
superconductor-double-quantum-dot system where these... | cond-mat_mes-hall |
Anisotropic RKKY interaction in spin polarized graphene: We study the Ruderman-Kittle-Kasuya-Yosida (RKKY) interaction in the presence
of spin polarized two dimensional Dirac fermions. We show that a spin
polarization along the z-axis mediates an anisotropic interaction which
corresponds to a XXZ model interaction betw... | cond-mat_mes-hall |
Superconducting insulators and localization of Cooper pairs: Rapid miniaturization of electronic devices and circuits demands profound
understanding of fluctuation phenomena at the nanoscale. Superconducting
nanowires -- serving as important building blocks for such devices -- may
seriously suffer from fluctuations whi... | cond-mat_mes-hall |
Strain induced mobility modulation in single-layer MoS$_{2}$: In this paper the effect of biaxial and uniaxial strain on the mobility of
single-layer MoS$_{2}$ for temperatures T $>$ 100 K is investigated. Scattering
from intrinsic phonon modes, remote phonon and charged impurities are
considered along with static scre... | cond-mat_mes-hall |
Effect of strain, thickness, and local surface environment on electron
transport properties of oxygen-terminated copper thin films: Electron transport is studied in surface oxidized single-crystal copper thin
films with a thickness of up to 5.6 nm by applying density functional theory
and density functional tight bin... | cond-mat_mes-hall |
Interaction effects on a Majorana zero mode leaking into a quantum dot: We have recently shown [Phys. Rev. B {\bf 89}, 165314 (2014)] that a
non--interacting quantum dot coupled to a one--dimensional topological
superconductor and to normal leads can sustain a Majorana mode even when the
dot is expected to be empty, \e... | cond-mat_mes-hall |
Supercurrent carried by non-equlibrium quasiparticles in a multiterminal
Josephson junction: We theoretically study coherent multiple Andreev reflections in a biased
three-terminal Josephson junction. We demonstrate that the direct current
flowing through the junction consists of supercurrent components when the bias... | cond-mat_mes-hall |
Gate-tuned quantum oscillations of topological surface states in
beta-Ag2Te: We report the strong experimental evidence of the existence of topological
surface states with large electric field tunability and mobility in beta-Ag2Te.
Pronounced 2D SdH oscillations have been observed in beta-Ag2Te nanoplates. A
Berry ph... | cond-mat_mes-hall |
Impurity screening and stability of Fermi arcs against Coulomband
magnetic scattering in a Weyl monopnictide: We present a quasiparticle interference study of clean and Mn surface-doped
TaAs, a prototypical Weyl semimetal, to test the screening properties as well
as the stability of Fermi arcs against Coulomb and mag... | cond-mat_mes-hall |
AC Josephson transport through interacting quantum dots: We investigate the AC Josephson current through a quantum dot with strong
Coulomb interaction attached to two superconducting and one normal lead. To
this end, we perform a perturbation expansion in the tunneling couplings within
a diagrammatic real-time techniqu... | cond-mat_mes-hall |
Zero-bias anomaly and Kondo-assisted quasi-ballistic 2D transport: Nonequilibrium transport measurements in mesoscopic quasi-ballistic 2D
electron systems show an enhancement in the differential conductance around the
Fermi energy. At very low temperatures, such a zero-bias anomaly splits,
leading to a suppression of l... | cond-mat_mes-hall |
Quiet SDS Josephson Junctions for Quantum Computing: Unconventional superconductors exhibit an order parameter symmetry lower than
the symmetry of the underlying crystal lattice. Recent phase sensitive
experiments on YBCO single crystals have established the d-wave nature of the
cuprate materials, thus identifying unam... | cond-mat_mes-hall |
Magnetic states and ferromagnetic resonance in geometrically frustrated
arrays of multilayer ferromagnetic nanoparticles ordered on triangular
lattices: We present a theoretical investigation of magnetostatic interaction effects
in geometrically frustrated arrays of anisotropic multilayer ferromagnetic
nanoparticle... | cond-mat_mes-hall |
Rashba scattering in the low-energy limit: We study potential scattering in a two-dimensional electron gas with Rashba
spin-orbit coupling in the limit that the energy of the scattering electron
approaches the bottom of the lower spin-split band. Focusing on two
spin-independent circularly symmetric potentials, an infi... | cond-mat_mes-hall |
Coulomb drag in quantum circuits: We study drag effect in a system of two electrically isolated quantum point
contacts (QPC), coupled by Coulomb interactions. Drag current exhibits maxima
as a function of QPC gate voltages when the latter are tuned to the transitions
between quantized conductance plateaus. In the linea... | cond-mat_mes-hall |
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