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Controlling surface charge and spin density oscillations by Dirac
plasmon interaction in thin topological insulators: We study the selective excitation at infrared and THz frequencies of optical
and acoustic plasmonic modes supported by thin topological insulators. These
modes are characterized by effective net charg... | cond-mat_mes-hall |
Spin-flip transitions between Zeeman sublevels in semiconductor quantum
dots: We have studied spin-flip transitions between Zeeman sublevels in GaAs
electron quantum dots. Several different mechanisms which originate from
spin-orbit coupling are shown to be responsible for such processes.
It is shown that spin-latt... | cond-mat_mes-hall |
Disentangling electron- and electric field-induced ring-closing
reactions in a diarylethene derivative on Ag(111): Using scanning tunneling microscopy and spectroscopy we investigate the
adsorption properties and ring-closing reaction of a diarylethene derivative
(C5F-4Py) on a Ag(111) surface. We identify an electro... | cond-mat_mes-hall |
Index theorems, generalized Hall currents and topology for gapless
defect fermions: We show how the index of the fermion operator from the Euclidean action can
be used to uncover the existence of gapless modes living on defects (such as
edges and vortices) in topological insulators and superconductors. The 1-loop
Fey... | cond-mat_mes-hall |
Tunneling Conductance in a Two-dimensional Dirac Semimetal Protected by
Non-symmorphic Symmetry: We theoretically study a tunneling effect in a two-dimensional Dirac
semimetal with two Dirac points protected by non-symmorphic symmetries. The
tunnel barrier can be arranged by a magnetic exchange potential which opens ... | cond-mat_mes-hall |
Spontaneous interlayer exciton coherence in quantum Hall bilayers at
nu=1 and nu=2: a tutorial: This tutorial paper reviews some of the physics of quantum Hall bilayers with
a focus on the case where there is low or zero tunnelling between the two
layers. We describe the interlayer coherent states at filling factors ... | cond-mat_mes-hall |
Effective medium theory for disordered two-dimensional graphene: We develop an Effective Medium Theory to study the electrical transport
properties of disordered graphene. The theory includes non-linear screening and
exchange-correlation effects allowing us to consider experimentally relevant
strengths of the Coulomb i... | cond-mat_mes-hall |
Layered Opposite Rashba Spin-Orbit Coupling in Bilayer Graphene: Loss of
Spin Chirality, Symmetry Breaking and Topological Transition: Inversion symmetry in bilayer graphene allows for layered opposite Rashba
spin-orbit coupling (LO-RSOC) -- the situation when the RSOC has the same
magnitude but the opposite sign in ... | cond-mat_mes-hall |
Prediction of the Magnetotoroidic Effect from Atomistic Simulations: An effective Hamiltonian technique is used to investigate the effect of
applying curled electric fields on physical properties of stress-free BiFeO3
dots being under open-circuit electrical boundary conditions. It is discovered
that such fields can le... | cond-mat_mes-hall |
Partition Functions of Non-Abelian Quantum Hall States: Partition functions of edge excitations are obtained for non-Abelian Hall
states in the second Landau level, such as the anti-Read-Rezayi state, the
Bonderson-Slingerland hierarchy and the Wen non-Abelian fluid, as well as for
the non-Abelian spin-singlet state. T... | cond-mat_mes-hall |
A fast, sensitive, room-temperature graphene nanomechanical bolometer: Bolometers are a powerful and vital means of detecting light in the IR to THz
frequencies, and they have been adopted for a range of uses from astronomical
observation to thermal imaging. As uses diversify, there is an increasing
demand for faster, ... | cond-mat_mes-hall |
Magnetization damping in a local-density approximation: The linear response of itinerant transition metal ferromagnets to transverse
magnetic fields is studied in a self-consistent adiabatic local-density
approximation. The susceptibility is calculated from a microscopic Hamiltonian,
including spin-conserving impuritie... | cond-mat_mes-hall |
Interaction of phonons with discrete breather in strained graphene: We numerically analyze the interaction of small-amplitude phonon waves with
standing gap discrete breather (DB) in strained graphene. To make the system
support gap DB, strain is applied to create a gap in the phonon spectrum. We
only focus on the in-p... | cond-mat_mes-hall |
Electronic transport in Si nanowires: Role of bulk and surface disorder: We calculate the resistance and mean free path in long metallic and
semiconducting silicon nanowires (SiNWs) using two different numerical
approaches: A real space Kubo method and a recursive Green's function method.
We compare the two approaches ... | cond-mat_mes-hall |
Topological electronic states and thermoelectric transport at phase
boundaries in single-layer WSe$_2$: An effective Hamiltonian theory: Monolayer transition metal dichalcogenides in the distorted octahedral
1T$^\prime$ phase exhibit a large bulk bandgap and gapless boundary states,
which is an asset in the ongoing q... | cond-mat_mes-hall |
Spin-wave diode and circulator based on unidirectional coupling: In magnonics, an emerging branch of wave physics characterized by low-energy
consumption, it is highly desirable to realize circuit elements within the
scope of spin-wave computing. Here, based on numerical simulations, we
demonstrate the functionality of... | cond-mat_mes-hall |
Two-dimensional group delay in graphene probed by spin precession
measurements: We take graphene as an example to demonstrate that the present widely adopted
expression is only the scattering component of a true 2D group delay in the
condensed matter context, in which the spatial Goos-H\"{a}nchen (GH) shift
along an ... | cond-mat_mes-hall |
Unconventional transport properties in systems with triply degenerate
quadratic band crossings: A quadratic band crossing (QBC) is a crossing of two bands with quadratic
dispersion, which has been intensively investigated due to its appearance in
Bernal-stacked bilayer graphene. Here, we study an extension of QBCs, t... | cond-mat_mes-hall |
Intervalley scattering of graphene massless Dirac fermions at 3-periodic
grain boundaries: We study how low-energy charge carriers scatter off periodic and linear
graphene grain boundaries oriented along the zigzag direction with a
periodicity three times greater than that of pristine graphene. These defects
map the ... | cond-mat_mes-hall |
Resistance of a Molecule: In recent years, several experimental groups have reported measurements of
the current-voltage (I-V) characteristics of individual or small numbers of
molecules. Our purpose in this chapter is to provide an intuitive explanation
for the observed I-V characteristics using simple models to illus... | cond-mat_mes-hall |
Noise-created bistability and stochastic resonance of impurities
diffusing in a semiconductor layer: We investigate the dynamics of impurities walking along a semiconductor layer
assisted by thermal noise of strength $D$ and external harmonic potential
$V(x)$. Applying a nonhomogeneous hot temperature in the vicinity... | cond-mat_mes-hall |
Valley-Spin Polarization in the Magneto-Optical Response of Silicene and
Other Similar 2D Crystals: We calculate the magneto-optical conductivity and electronic density of
states for silicene, the silicon equivalent of graphene, and similar crystals
such as germanene. In the presence of a perpendicular magnetic field... | cond-mat_mes-hall |
Metal-insulator transition and tunable Dirac-cone surface state in the
topological insulator TlBi1-xSbxTe2 studied by angle-resolved photoemission: We report a systematic angle-resolved photoemission spectroscopy on
topological insulator (TI) TlBi1-xSbxTe2 which is bulk insulating at 0.5 < x <
0.9 and undergoes a met... | cond-mat_mes-hall |
Canted ground state in artificial molecules at high magnetic fields: We analyze the transitions that a magnetic field provokes in the ground state
of an artificial homonuclear diatomic molecule. For that purpose, we have
performed numerical diagonalizations for a double quantum dot around the regime
of filling factor 2... | cond-mat_mes-hall |
Renormalization of the dephasing by zero point fluctuations: We study the role of zero-point-fluctuations (ZPF) in dephasing at low
temperature. Unlike the Caldeira-Leggett model where the interaction is with an
homogeneous fluctuating field of force, here we consider the effect of short
range scattering by localized b... | cond-mat_mes-hall |
Current-induced skyrmion motion on magnetic nanotubes: Magnetic skyrmions are believed to be the promising candidate of information
carriers in spintronics. However, the skyrmion Hall effect due to the
nontrivial topology of skyrmions can induce a skyrmion accumulation or even
annihilation at the edge of the devices, w... | cond-mat_mes-hall |
Magneto-intersubband resistance oscillations in GaAs quantum wells
placed in a tilted magnetic field: The magnetotransport of highly mobile 2D electrons in wide GaAs single
quantum wells with three populated subbands placed in titled magnetic fields is
studied. The bottoms of the lower two subbands have nearly the sa... | cond-mat_mes-hall |
Quasiparticle Interference Studies of Quantum Materials: Exotic electronic states are realized in novel quantum materials. This field
is revolutionized by the topological classification of materials. Such
compounds necessarily host unique states on their boundaries. Scanning
tunneling microscopy studies of these surfac... | cond-mat_mes-hall |
Graphene Terahertz Absorption: The unique terahertz properties of graphene has been identified for novel
optoelectronic applications. In a graphene sample with bias voltage added,
there is an enhanced absorption in the far infrared region and a diminished
absorption in the infrared region. The strength of enhancement(d... | cond-mat_mes-hall |
Suppression of the Persistent Spin Hall Current by Defect Scattering: We study the linear response spin Hall conductivity of a two-dimensional
electron gas (2DEG) in the presence of the Rashba spin orbit interaction in the
diffusive transport regime. When defect scattering is modeled by isotropic
short-range potential ... | cond-mat_mes-hall |
Topological phases of quantized light: Topological photonics is an emerging research area that focuses on the
topological states of classical light. Here we reveal the topological phases
that are intrinsic to the particle nature of light, i.e., solely related to the
quantized Fock states and the inhomogeneous coupling ... | cond-mat_mes-hall |
Field induced phase segregation and collective excitations of a trapped
spinor Bose-Einstein condensate: A hydrodynamic description is used to study the zero-temperature properties
of a trapped spinor Bose-Einstein condensate in the presence of a uniform
magnetic field. We show that, in the case of antiferromagnetic ... | cond-mat_mes-hall |
Band structure and magnetotransport of a two-dimensional electron gas in
the presence of spin-orbit interaction: The band structure and magnetotransport of a two-dimensional electron gas
(2DEG), in the presence of the Rashba (RSOI) and Dresselhaus (DSOI) terms of
the spin-orbit interaction and of a perpendicular magn... | cond-mat_mes-hall |
Commensuration torques and lubricity in double moire systems: We study the commensuration torques and layer sliding energetics of
alternating twist trilayer graphene (t3G) and twisted bilayer graphene on
hexagonal boron nitride (t2G/BN) that have two superposed moire interfaces.
Lattice relaxations for typical graphene... | cond-mat_mes-hall |
Magnetic field enhancement of organic photovoltaic cells performance: Charge separation is a critical process for achieving high efficiencies in
organic photovoltaic cells. The initial tightly bound excitonic electron-hole
pair has to dissociate fast enough in order to avoid photocurrent generation
and thus power conve... | cond-mat_mes-hall |
Theory of magnetoelectric photocurrent generated by direct interband
transitions in semiconductor quantum well: A linearly polarized light normally incident on a semiconductor quantum well
with spin-orbit coupling may generate pure spin current via direct interband
optical transition. An electric photocurrent can be ... | cond-mat_mes-hall |
Circular edge states in photonic crystals with a Dirac node: Edge states are studied for the two-dimensional Dirac equation in a circular
geometry. The properties of the two-component electromagnetic field are
discussed in terms of the three-component polarization field, which can form a
vortex structure near the Dirac... | cond-mat_mes-hall |
Imaging ferroelectric domains with a single-spin scanning quantum sensor: The ability to sensitively image electric fields is important for
understanding many nanoelectronic phenomena, including charge accumulation at
surfaces and interfaces and field distributions in active electronic devices. A
particularly exciting ... | cond-mat_mes-hall |
Interference of magnetointersubband and phonon-induced resistance
oscillations in single GaAs quantum wells with two populated subbands: Low-temperature electron magnetotransport in single GaAs quantum wells with
two populated subbands is studied at large filling factors.
Magneto-inter-subband (MIS) and acoustic-phon... | cond-mat_mes-hall |
Insights on magnon topology and valley-polarization in 2D bilayer
quantum magnets: The rich and unconventional physics in layered 2D magnets can open new
avenues for topological magnonics and magnon valleytronics. In particular,
two-dimensional (2D) bilayer quantum magnets are gaining increasing attention
due to thei... | cond-mat_mes-hall |
Signatures of neutral quantum Hall modes in transport through
low-density constrictions: Constrictions in fractional quantum Hall (FQH) systems not only facilitate
backscattering between counter-propagating edge modes, but also may reduce the
constriction filling fraction $\nu_c$ with respect to the bulk filling frac... | cond-mat_mes-hall |
Macroscopic Resonant Tunneling through Andreev Interferometers: We investigate the conductance through and the spectrum of ballistic chaotic
quantum dots attached to two s-wave superconductors, as a function of the phase
difference $\phi$ between the two order parameters. A combination of analytical
techniques -- rando... | cond-mat_mes-hall |
Synthesis of Graphene on Gold: Here we report chemical vapor deposition of graphene on gold surface at
ambient pressure. We studied effects of the growth temperature, pressure and
cooling process on the grown graphene layers. The Raman spectroscopy of the
samples reveals the essential properties of the graphene grown o... | cond-mat_mes-hall |
Effects of substrate corrugation during helium adsorption on graphene in
the grand canonical ensemble: Adsorption of 4He on atomically flat substrates such as graphene provides a
route towards the engineering of low dimensional quantum phases including
superfluids and strongly interacting insulators. In this study, w... | cond-mat_mes-hall |
Gibbs phenomenon and the emergence of the steady-state in quantum
transport: Simulations are increasingly employing explicit reservoirs - internal, finite
regions - to drive electronic or particle transport. This naturally occurs in
simulations of transport via ultracold atomic gases. Whether the simulation is
numeri... | cond-mat_mes-hall |
Subgap dynamics of double quantum dot coupled between superconducting
and normal leads: Dynamical processes induced by the external time-dependent fields can provide
valuable insight into the characteristic energy scales of a given physical
system. We investigate them here in a nanoscopic heterostructure, consisting ... | cond-mat_mes-hall |
Parametric symmetry breaking in a nonlinear resonator: Much of the physical world around us can be described in terms of harmonic
oscillators in thermodynamic equilibrium. At the same time, the far from
equilibrium behavior of oscillators is important in many aspects of modern
physics. Here, we investigate a resonating... | cond-mat_mes-hall |
Time-Loop Formalism for Irreversible Quantum Problems: Steady State
Transport in Junctions with Asymmetric Dynamics: Non-unitary quantum mechanics has been used in the past to study
irreversibility, dissipation and decay in a variety of physical systems. In
this letter, we propose a general scheme to deal with system... | cond-mat_mes-hall |
Charge puddles in the bulk and on the surface of the topological
insulator BiSbTeSe$_2$ studied by scanning tunneling microscopy and optical
spectroscopy: The topological insulator BiSbTeSe$_2$ corresponds to a compensated
semiconductor in which strong Coulomb disorder gives rise to the formation of
charge puddles,... | cond-mat_mes-hall |
Magnetic-field asymmetry of nonlinear mesoscopic transport: We investigate departures of the Onsager relations in the nonlinear regime of
electronic transport through mesoscopic systems. We show that the nonlinear
current--voltage characteristic is not an even function of the magnetic field
due only to the magnetic-fie... | cond-mat_mes-hall |
Direct Bandgap Emission from Hexagonal Ge and SiGe Alloys: Silicon crystallized in the usual cubic (diamond) lattice structure has
dominated the electronics industry for more than half a century. However, cubic
silicon (Si), germanium (Ge) and SiGe-alloys are all indirect bandgap
semiconductors that cannot emit light e... | cond-mat_mes-hall |
Particle tunneling through a polarizable insulator: The tunneling probability between two leads connected by a molecule, a chain,
a film, or a bulk polarizable insulator is investigated within a model of an
electron tunneling from lead A to a state higher in energy, describing the
barrier, and from there to lead B. To ... | cond-mat_mes-hall |
Influence of Landau level mixing on the properties of elementary
excitations in graphene in strong magnetic field: Massless Dirac electrons in graphene fill Landau levels with energies scaled
as square roots of their numbers. Coulomb interaction between electrons leads
to mixing of different Landau levels. The relati... | cond-mat_mes-hall |
Colossal orbital Zeeman effect driven by tunable spin-Berry curvature in
a kagome metal: Berry phase and the related concept of Berry curvature can give rise to many
unconventional phenomena in solids. In this work, we discover colossal orbital
Zeeman effect of topological origin in a newly synthesized bilayer kagome... | cond-mat_mes-hall |
Reversible Single Spin Control of Individual Magnetic Molecule by
Hydrogen Atom Adsorption: The reversible control of a single spin of an atom or a molecule is of great
interest in Kondo physics and a potential application in spin based
electronics.Here we demonstrate that the Kondo resonance of manganese
phthalocyan... | cond-mat_mes-hall |
Non-Markovian electron dynamics in nanostructures coupled to dissipative
contacts: In quasiballistic semiconductor nanostructures, carrier exchange between the
active region and dissipative contacts is the mechanism that governs
relaxation. In this paper, we present a theoretical treatment of transient
quantum transp... | cond-mat_mes-hall |
Spin-splitting in the quantum Hall effect of disordered GaAs layers with
strong overlap of the spin subbands: With minima in the diagonal conductance G_{xx} and in the absolute value of
the derivative |dG_{xy}/dB| at the Hall conductance value G_{xy}=e^{2}/h,
spin-splitting is observed in the quantum Hall effect of h... | cond-mat_mes-hall |
Realization of bulk insulating property and carrier manipulation in
reversible spin current regime of the ideal topological insulator TlBiSe2: The surfaces of three-dimensional topological insulators (TIs) characterized
by a spin-helical Dirac fermion provide a fertile ground for realizing exotic
phenomena as well as... | cond-mat_mes-hall |
Efficient Computation of Kubo Conductivity for Incommensurate 2D
Heterostructures: Here we introduce a numerical method for computing conductivity via the Kubo
Formula for incommensurate 2D bilayer heterostructures using a tight-binding
framework. We begin with deriving the momentum space formulation and Kubo
Formula... | cond-mat_mes-hall |
Universal quantum computation on a semiconductor quantum wire network: Universal quantum computation (UQC) using Majorana fermions on a 2D
topological superconducting (TS) medium remains an outstanding open problem.
This is because the quantum gate set that can be generated by braiding of the
Majorana fermions does not... | cond-mat_mes-hall |
Controlling Hot Electron Spatial and Momentum Distributions in
Nanoplasmonic Systems: Volume versus Surface Effects: Hot carrier spatial and momentum distributions in nanoplasmonic systems
depend sensitively on the optical excitation parameters and nanoscale geometry,
which therefore determine the efficiency and func... | cond-mat_mes-hall |
Theory of defect dynamics in graphene: defect groupings and their
stability: We use our theory of periodized discrete elasticity to characterize defects
in graphene as the cores of dislocations or groups of dislocations. Earlier
numerical implementations of the theory predicted some of the simpler defect
groupings ob... | cond-mat_mes-hall |
Understanding the structure of the first atomic contact in Gold: We have studied experimentally the phenomena of jump-to-contact (JC) and
jump-out-of-contact (JOC) in gold electrodes. JC can be observed at the first
contact when the two metals approach each other while JOC occurs in the last
contact before breaking. Wh... | cond-mat_mes-hall |
Correlation and dephasing effects on the non-radiative coherence between
bright excitons in an InAs QD ensemble measured with 2D spectroscopy: Exchange-mediated fine-structure splitting of bright excitons in an ensemble
of InAs quantum dots is studied using optical two-dimensional Fourier-transform
spectroscopy. By m... | cond-mat_mes-hall |
Surface twist instabilities and skyrmion states in chiral ferromagnets: In epitaxial MnSi/Si(111) films, the in-plane magnetization saturation is
never reached due to the formation of specific surface chiral modulations with
the propagation direction perpendicular to the film surfaces [Wilson et al.
Phys. Rev. B 88, 21... | cond-mat_mes-hall |
The origin of the core-level binding energy shifts in nanoclusters: We investigate the shifts of the core-level binding energies in small gold
nanoclusters by using {\it ab initio} density functional theory calculations.
The shift of the 4$f$ states is calculated for magic number nanoclusters in a
wide range of sizes a... | cond-mat_mes-hall |
Long-range Kitaev Chains via Planar Josephson Junctions: We show how a recently proposed solid state Majorana platform comprising a
planar Josephson junction proximitized to a 2D electron gas (2DEG) with Rashba
spin-orbit coupling and Zeeman field can be viewed as an effectively one
dimensional (1D) Kitaev chain with l... | cond-mat_mes-hall |
Temperature evolution of the quantum Hall effect in the FISDW state:
Theory vs Experiment: We discuss the temperature dependence of the Hall conductivity $\sigma_{xy}$
in the magnetic-field-induced spin-density-wave (FISDW) state of the
quasi-one-dimensional Bechgaard salts (TMTSF)_2X. Electronic thermal
excitations ... | cond-mat_mes-hall |
Accessing the anisotropic non-thermal phonon populations in black
phosphorus: We combine femtosecond electron diffuse scattering experiments and
first-principles calculations of the coupled electron-phonon dynamics to
provide a detailed momentum-resolved picture of the ultrafast lattice
thermalization in a thin film ... | cond-mat_mes-hall |
Electrostatic quantum dot confinement in phosphorene: We consider states localized by electrostatic potentials in phosphorene using
an atomistic tight binding approach. From the results of the tight-binding
calculations of the confined states we extract effective masses for the
conduction band electrons in the armchair... | cond-mat_mes-hall |
Asymmetric power dissipation in electronic transport through a quantum
point contact: We investigate the power dissipated by an electronic current flowing through
a quantum point contact in a two-dimensional electron gas. Based on the
Landauer-B\"uttiker approach to quantum transport, we evaluate the power that
is di... | cond-mat_mes-hall |
Electron states in the quantum wire with periodic serial structure: A model quantum wire embedded in a matrix permeable to electron waves is
investigated in terms of electronic states. The wire is assumed to have a 1D
crystal structure. Through electron waves propagating in its surroundings,
lateral modes are coupled w... | cond-mat_mes-hall |
Subgap features due to quasiparticle tunneling in quantum dots coupled
to superconducting leads: We present a microscopic theory of transport through quantum dot set-ups
coupled to superconducting leads. We derive a master equation for the reduced
density matrix to lowest order in the tunneling Hamiltonian and focus ... | cond-mat_mes-hall |
Atomic relaxation and electronic structure in twisted bilayer MoS2 with
rotation angle of 5.09 degrees: It is now well established theoretically and experimentally that a moir\'e
pattern, due to a rotation of two atomic layers with respect to each other,
creates low-energy flat bands. First discovered in twisted bila... | cond-mat_mes-hall |
Quantum Entanglement in Nanocavity Arrays: We show theoretically how quantum interference between linearly coupled modes
with weak local nonlinearity allows the generation of continuous variable
entanglement. By solving the quantum master equation for the density matrix, we
show how the entanglement survives realistic ... | cond-mat_mes-hall |
Disorder and localization effects on the local spectroscopic and
infrared-optical properties of $\mbox{Ga}_{1-x}\mbox{Mn}_x\mbox{As}$: We study numerically the influence of disorder and localization effects on
the local spectroscopic characteristics and infrared optical properties of
$\mbox{Ga}_{1-x}\mbox{Mn}_x\mbox{... | cond-mat_mes-hall |
Limitations of the kinetic theory to describe the near-field heat
exchanges in many-body systems: We investigate the radiative heat transfer along a chain of nanoparticles
using both a purely kinetic approach based on the solution of a Boltzmann
transport equation and an exact method (Landauer's approach) based on
fl... | cond-mat_mes-hall |
2D massless QED Hall half-integer conductivity and graphene: Starting from the photon self-energy tensor in a magnetized medium, the 3D
complete antisymmetric form of the conductivity tensor is found in the static
limit of a fermion system $C$ non-invariant under fermion-antifermion exchange.
The massless relativistic ... | cond-mat_mes-hall |
Conductance Quantization and Magnetoresistance in Magnetic Point
Contacts: We theoretically study the electron transport through a magnetic point
contact (PC) with special attention to the effect of an atomic scale domain
wall (DW). The spin precession of a conduction electron is forbidden in such an
atomic scale DW ... | cond-mat_mes-hall |
Spin-thermopower in interacting quantum dots: Using analytical arguments and the numerical renormalization group method we
investigate the spin-thermopower of a quantum dot in a magnetic field. In the
particle-hole symmetric situation the temperature difference applied across the
dot drives a pure spin current without ... | cond-mat_mes-hall |
A new kind of 2D topological insulators BiCN with a giant gap and its
substrate effects: Based on DFT calculation, we predict that BiCN, i.e., bilayer Bi films
passivated with -CN group, is a novel 2D Bi-based material with highly
thermodynamic stability, and demonstrate that it is also a new kind of 2D TI
with a gia... | cond-mat_mes-hall |
Discovery of highly spin-polarized conducting surface states in the
strong spin-orbit coupling semiconductor Sb$_2$Se$_3$: Majority of the A$_2$B$_3$ type chalcogenide systems with strong spin-orbit
coupling, like Bi$_2$Se$_3$, Bi$_2$Te$_3$ and Sb$_2$Te$_3$ etc., are
topological insulators. One important exception is... | cond-mat_mes-hall |
Non-Hermitian boundary and interface states in nonreciprocal
higher-order topological metals and electrical circuits: Non-Hermitian skin-edge states emerge only at one edge in one-dimensional
nonreciprocal chains, where all states are localized at the edge irrespective
of eigenvalues. The bulk topological number is t... | cond-mat_mes-hall |
Graphene wormholes: A condensed matter illustration of Dirac fermions in
curved space: We study the properties of graphene wormholes in which a short nanotube acts
as a bridge between two graphene sheets, where the honeycomb carbon lattice is
curved from the presence of 12 heptagonal defects. By taking the nanotube
b... | cond-mat_mes-hall |
Ab initio study of structural stability of small 3$d$ late transition
metal clusters : Interplay of magnetization and hybridization: Using first-principles density functional theory based calculations, we
analyze the structural stability of small clusters of 3$d$ late transition
metals. We consider the relative stabi... | cond-mat_mes-hall |
A Mechanical Implementation and Diagrammatic Calculation of Entangled
Basis States: We give for the first time a diagrammatic calculational tool of quantum
entanglement. We present a pedagogical and simple mechanical implementation of
quantum entanglement or "spooky action at a distance" to give a tangible
realizatio... | cond-mat_mes-hall |
"Reservoir model" for shallow modulation-doped digital magnetic quantum
wells: Digital Magnetic Heterostructures (DMH) are semiconductor structures with
magnetic monolayers. Here we study electronic and magneto-transport properties
of shallow modulation-doped (ZnSe/ZnCdSe) DMHs with spin-5/2 Mn impurities. We
compare... | cond-mat_mes-hall |
Analysis of the exciton-exciton interaction in semiconductor quantum
wells: The exciton-exciton interaction is investigated for quasi-two-dimensional
quantum structures. A bosonization scheme is applied including the full spin
structure. For generating the effective interaction potentials, the
Hartree-Fock and Heitle... | cond-mat_mes-hall |
Probing surface states exposed by crystal terminations at arbitrary
orientations of three-dimensional topological insulators: The topological properties of the bulk band structure of a three-dimensional
topological insulator (TI) manifest themselves in the form of metallic surface
states. In this paper, we propose a ... | cond-mat_mes-hall |
Contamination of polymethylmethacrylate by organic quantum emitters: We report the observation of ubiquitous contamination of
polymethylmethacrylate by organic molecules with optical activity in the
visible spectral range. Contamination sites of individual solvent-specific
fluorophores in thin films of polymethylmethac... | cond-mat_mes-hall |
Effect of electron-phonon scattering on shot noise in nanoscale
junctions: We investigate the effect of electron-phonon inelastic scattering on shot
noise in nanoscale junctions in the regime of quasi-ballistic transport. We
predict that when the local temperature of the junction is larger than its
lowest vibrational... | cond-mat_mes-hall |
Quantum heat transfer: A Born Oppenheimer method: We develop a Born-Oppenheimer type formalism for the description of quantum
thermal transport along hybrid nanoscale objects. Our formalism is suitable for
treating heat transfer in the off-resonant regime, where e.g., the relevant
vibrational modes of the interlocated ... | cond-mat_mes-hall |
Topological Wannier cycles for the bulk and edges: Topological materials are often characterized by unique edge states which are
in turn used to detect different topological phases in experiments. Recently,
with the discovery of various higher-order topological insulators, such
spectral topological characteristics are ... | cond-mat_mes-hall |
Relation between unidirectional spin Hall magnetoresistance and spin
current-driven magnon generation: We perform electronic measurements of unidirectional spin Hall
magnetoresistance (USMR) in a Permalloy/Pt bilayer, in conjunction with
magneto-optical Brillouin light spectroscopy of spin current-driven magnon
popul... | cond-mat_mes-hall |
Fano-Josephson effect of Majorana bound states: We investigate the Josephson current in a Fano-Josephson junction formed by
the direct coupling between two topological superconducting wires and their
indirect coupling via a quantum dot. It is found that when two Majorana zero
modes respectively appear in the wires, the... | cond-mat_mes-hall |
Steady-State Entanglement in the Nuclear Spin Dynamics of a Double
Quantum Dot: We propose a scheme for the deterministic generation of steady-state
entanglement between the two nuclear spin ensembles in an electrically defined
double quantum dot. Due to quantum interference in the collective coupling to
the electron... | cond-mat_mes-hall |
Modulating spin relaxation in nanowires with infrared light at room
temperature: Spintronic devices usually rely on long spin relaxation times and/or lengths
for optimum performance. Therefore, the ability to modulate these quantities
with an external agent offers unique possibilities. The dominant spin
relaxation me... | cond-mat_mes-hall |
Thermally-Assisted Spin-Transfer Torque Magnetization Reversal of
Uniaxial Nanomagnets in Energy Space: The asymptotic behavior of switching time as a function of current for a
uniaxial macrospin under the effects of both spin-torque and thermal noise is
explored analytically by focusing on its diffusive energy space... | cond-mat_mes-hall |
Chirality from interfacial spin-orbit coupling effects in magnetic
bilayers: As nanomagnetic devices scale to smaller sizes, spin-orbit coupling due to
the broken structural inversion symmetry at interfaces becomes increasingly
important. Here we study interfacial spin-orbit coupling effects in magnetic
bilayers usin... | cond-mat_mes-hall |
Excitons in atomically thin black phosphorus: Raman scattering and photoluminescence spectroscopy are used to investigate
the optical properties of single layer black phosphorus obtained by mechanical
exfoliation of bulk crystals under an argon atmosphere. The Raman spectroscopy,
performed in situ on the same flake as ... | cond-mat_mes-hall |
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