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A simple view on the quantum Hall system: The physics of the quantum Hall system becomes very simple when studied on a
thin torus. Remarkably, however, the very rich structure still exists in this
limit and there is a continuous route to the bulk system. Here we review recent
progress in understanding various features ... | cond-mat_mes-hall |
Spin waves in zigzag graphene nanoribbons and the stability of edge
ferromagnetism: We study the low energy spin excitations of zigzag graphene nanoribbons of
varying width. We find their energy dispersion at small wave vector to be
dominated by antiferromagnetic correlations between the ribbon's edges, in
accrodance... | cond-mat_mes-hall |
Saturation and bistability of defect-mode intersubband polaritons: In this article we report about linear and nonlinear optical properties of
intersubband cavity polariton samples, where the resonant photonic mode is a
defect state in a metallo-dielectric photonic crystal slab. By tuning a single
geometric parameter of... | cond-mat_mes-hall |
Ligand effects on the electronic structure and magnetism of magnetite
surfaces: We address the effect of functionalization on the electronic and magnetic
properties of magnetite surface as an indicator of the same properties in
nanoparticles too big for a direct ab-initio approach. Using well-established
methods and ... | cond-mat_mes-hall |
High temperature magnetism and microstructure of semiconducting
ferromagnetic alloy (GaSb)$_{1-x}$(MnSb)$_{x}$: We have studied the properties of relatively thick (about 120 nm) magnetic
composite films grown by pulsed laser deposition method using
(GaSb)$_{0.59}$(MnSb)$_{0.41}$ eutectic compound as a target for sput... | cond-mat_mes-hall |
Quantum Coherent Multielectron Processes in an Atomic Scale Contact: The light emission from a scanning tunneling microscope operated on a Ag(111)
surface at 6 K is analyzed from low conductances to values approaching the
conductance quantum. Optical spectra recorded at a sample voltages V reveal
emission with photon e... | cond-mat_mes-hall |
Anomalous Spin Dephasing in (110) GaAs Quantum Wells: Anisotropy and
Intersubband Effects: A strong anisotropy of electron spin decoherence is observed in GaAs/(AlGa)As
quantum wells grown on (110) oriented substrate. The spin lifetime of spins
perpendicular to the growth direction is about one order of magnitude sho... | cond-mat_mes-hall |
On the nature of the spin polarization limit in the warped Dirac cone of
the Bi2Te3: The magnitude of electron spin polarization in topologically protected
surface states is an important parameter with respect to spintronics
applications. In order to analyze the warped spin texture in Bi$_2$Te$_3$ thin
films, we comb... | cond-mat_mes-hall |
Vorticity and quantum turbulence in the merging of superfluid Helium
nanodroplets: We have studied the merging of two $^4$He droplets at zero temperature,
caused by their Van der Waals mutual attraction. During the early stages of the
merging, density structures appear which closely match the experimental
observation... | cond-mat_mes-hall |
Voltage switching and domain relocation in semiconductor superlattices: A numerical study of domain wall relocation during voltage switching with
different ramping times is presented for weakly coupled, doped semiconductor
superlattices exhibiting multistable domain formation in the first plateau of
their current-volta... | cond-mat_mes-hall |
Metastability and dynamics in remanent states of square artificial spin
ice with long-range dipole interactions: After removal of an applied magnetic field, artificial square spin ice can be
left in a metastable remanent state, with nonzero residual magnetization and
excess energy above the ground state. Using a mode... | cond-mat_mes-hall |
Periodic negative differential conductance in a single metallic
nano-cage: We report a bi-polar multiple periodic negative differential conductance
(NDC) effect on a single cage-shaped Ru nanoparticle measured using scanning
tunneling spectroscopy. This phenomenon is assigned to the unique
multiply-connected cage arc... | cond-mat_mes-hall |
Thermally-Activated Phase Slips in Superfluid Spin Transport in Magnetic
Wires: We theoretically study thermally-activated phase slips in superfluid spin
transport in easy-plane magnetic wires within the stochastic
Landau-Lifshitz-Gilbert phenomenology, which runs parallel to the
Langer-Ambegaokar-McCumber-Halperin t... | cond-mat_mes-hall |
Critical current of spin transfer torque-driven magnetization dynamics
in magnetic multilayers: The critical current of the spin transfer torque-driven magnetization
dynamics was studied by taking into account both spin pumping and the finite
penetration depth of the transverse spin current. We successfully reproduce... | cond-mat_mes-hall |
Non-equilibrium theory for strongly coupled quantum dot with arbitrary
on-site correlation strength: An analytical expression for the current through a single level quantum dot
for arbitrary strength of the on-site electron-electron interaction is derived
beyond standard mean-field theory. By describing the localised... | cond-mat_mes-hall |
Spin-Torque and Spin-Hall Nano-Oscillators: This paper reviews the state of the art in spin-torque and spin Hall effect
driven nano-oscillators. After a brief introduction to the underlying physics,
the authors discuss different implementations of these oscillators, their
functional properties in terms of frequency ran... | cond-mat_mes-hall |
Persistent currents and magnetic flux trapping in fragments of carbon
deposits containing multiwalled nanotubes: It is found that the magnetization curves of samples of fragments of cathode
carbon deposits with a high content of multiwalled nanotubes exhibit a
pronounced irreversible character, attesting to the induc... | cond-mat_mes-hall |
Geometrical Effect Explains Graphene Membrane Stiffening at Finite
Vacancy Concentrations: The presence of defects such as vacancies in solids has prominent effects on
their mechanical properties. It not only modifies the stiffness and strength of
materials, but also changes their morphologies. The latter effect is e... | cond-mat_mes-hall |
The Atomic and Electronic structure of 0° and 60° grain
boundaries in MoS2: We have investigated atomic and electronic structure of grain boundaries in
monolayer MoS2, where relative angles between two different grains are 0 and 60
degree. The grain boundaries with specific relative angle have been formed with
chemic... | cond-mat_mes-hall |
On the Relevance of Disorder for Dirac Fermions with Imaginary Vector
Potential: We consider the effects of disorder in a Dirac-like Hamiltonian. In order to
use conformal perturbation theory, we argue that one should consider disorder
in an imaginary vector potential. This affects significantly the signs of the
lowe... | cond-mat_mes-hall |
Kinetic Monte Carlo Approach to Non-equilibrium Bosonic Systems: We consider the use of a Kinetic Monte Carlo approach for the description of
non-equilibrium bosonic systems, taking non-resonantly excited
exciton-polariton condensates and bosonic cascade lasers as examples. In the
former case, the considered approach a... | cond-mat_mes-hall |
Non-adiabatic current generation in a finite width semiconductor ring: We consider a model of a semiconductor quantum ring of finite width in a
constant perpendicular magnetic field. We show how a current of the same order
as the persistent current can be generated non-adiabatically by a short
intensive pulse in the Te... | cond-mat_mes-hall |
Quantum gates by periodic driving: Topological quantum computation has been extensively studied due to its
robustness against decoherence. A conventional way to realize it is by
adiabatic operations---it requires relatively long time to accomplish so that
the speed of quantum computation slows down. In this work, we pr... | cond-mat_mes-hall |
Microscopic theory of quantum-transport phenomena in mesoscopic systems:
A Monte Carlo approach: A theoretical investigation of quantum-transport phenomena in mesoscopic
systems is presented. In particular, a generalization to ``open systems'' of
the well-known semiconductor Bloch equations is proposed. The presence ... | cond-mat_mes-hall |
Voltage-Controlled Low-Energy Switching of Nanomagnets through
Ruderman-Kittel-Kasuya-Yosida Interactions for Magnetoelectric Device
Applications: In this letter, we consider through simulation Ruderman-Kittel-Kasuya-Yosida
(RKKY) interactions between nanomagnets sitting on a conductive surface, and
voltage-control... | cond-mat_mes-hall |
Photon Absorption of Two-dimensional Nonsymmorphic Dirac Semimetals: Two-dimensional Dirac semimetals have attracted much attention because of
their linear energy dispersion and non-trivial Berry phase. Graphene-like 2D
Dirac materials are gapless only within certain approximations, e.g., if
spin-orbit coupling (SOC) i... | cond-mat_mes-hall |
Surface segregation in nanoparticles from first principles: FePt nanoparticles are known to exhibit reduced L1$_0$ order with decreasing
particle size. The reduction in order reduces the magnetic anisotropy and the
thermal stability of the direction of magnetization of the particle. The
phenomenon is addressed by inves... | cond-mat_mes-hall |
Deterministic formation of highly coherent nitrogen-vacancy centers
using a focused electron irradiation technique: We demonstrate fully three-dimensional and patterned localization of
nitrogen-vacancy (NV) centers in diamond with coherence times in excess of 1
ms. Nitrogen {\delta}-doping during CVD diamond growth v... | cond-mat_mes-hall |
Magneto-Electric Effect for Multiferroic Thin Film by Monte Carlo
Simulation: Magneto-electric effect in a multiferroic heterostructure film, i.e. a
coupled ferromagnetic-ferroelectric thin film, has been investigated through
the use of the Metropolis algorithm in Monte Carlo simulations. A classical
Heisenberg model... | cond-mat_mes-hall |
Effect of laser on thermopower of chiral carbon nanotube: An investigation of laser stimulated thermopower in chiral CNT is presented.
The thermopower of a chiral CNT is calculated using a tractable analytical
approach. This is done by solving the Boltzmann kinetic equation with energy
dispersion relation obtained in t... | cond-mat_mes-hall |
Excited State Quantum Couplings and Optical Switching of an Artificial
Molecule: We optically probe the spectrum of ground and excited state transitions of an
individual, electrically tunable self-assembled quantum dot molecule.
Photocurrent absorption measurements show that the spatially direct neutral
exciton trans... | cond-mat_mes-hall |
Fano resonance in Raman scattering of graphene: Fano resonances and their strong doping dependence are observed in Raman
scattering of single-layer graphene (SLG). As the Fermi level is varied by a
back-gate bias, the Raman G band of SLG exhibits an asymmetric line shape near
the charge neutrality point as a manifestat... | cond-mat_mes-hall |
Electron transport in semiconducting carbon nanotubes with
hetero-metallic contacts: We present an atomistic self-consistent study of the electronic and transport
properties of semiconducting carbon nanotube in contact with metal electrodes
of different work functions, which shows simultaneous electron and hole dopin... | cond-mat_mes-hall |
Using nonlocal surface transport to identify the axion insulator: The axion is a hypothetical but experimentally undetected particle. Recently,
the antiferromagnetic topological insulator MnBi$_2$Te$_4$ has been predicted
to host the axion insulator, but the experimental evidence remains elusive.
Specifically, the axio... | cond-mat_mes-hall |
Quantum Confinement in Si and Ge Nanostructures: We apply perturbative effective mass theory as a broadly applicable
theoretical model for quantum confinement (QC) in all Si and Ge nanostructures
including quantum wells (QWs), wires (Q-wires) and dots (QDs). Within the
limits of strong, medium, and weak QC, valence and... | cond-mat_mes-hall |
Dark Exciton Giant Rabi Oscillations with no External Magnetic Field: Multi-phonon physics is an emerging field that serves as a test bed for
fundamental quantum physics and several applications in metrology, on-chip
communication, among others. Quantum acoustic cavities or resonators are
devices that are being used to... | cond-mat_mes-hall |
Linear-response magnetoresistance effects in chiral systems: The chirality-induced spin selectivity (CISS) effect enables the detection of
chirality as electrical charge signals. It is often studied using a
two-terminal circuit geometry where a ferromagnet is connected to a chiral
component, and a change of electrical ... | cond-mat_mes-hall |
Band geometry from position-momentum duality at topological band
crossings: We show that the position-momentum duality offers a transparent
interpretation of the band geometry at the topological band crossings. Under
this duality, the band geometry with Berry connection is dual to the
free-electron motion under gauge... | cond-mat_mes-hall |
Coherent tunnelling across a quantum point contact in the quantum Hall
regime: The unique properties of quantum Hall devices arise from the ideal
one-dimensional edge states that form in a two-dimensional electron system at
high magnetic field. Tunnelling between edge states across a quantum point
contact (QPC) has a... | cond-mat_mes-hall |
Electrical Transport Across an Individual Magnetic Domain Wall in
(Ga,Mn)As Microdevices: Recent studies demonstrate that an individual magnetic domain wall (DW) can
be trapped and reproducibly positioned within multiterminal (Ga,Mn)As
microdevices. The electrical resistance obtained from such measurements is
found t... | cond-mat_mes-hall |
2D MoS2-Graphene-based multilayer van der Waals heterostructures:
Enhanced charge transfer and optical absorption, and electric-field tunable
Dirac point and band gap: Multilayer van der Waals (vdWs) heterostructures assembled by diverse
atomically thin layers have demonstrated a wide range of fascinating phenomena... | cond-mat_mes-hall |
Positive longitudinal spin magnetoconductivity in $\mathbb{Z}_{2}$
topological Dirac semimetals: Recently, a class of Dirac semimetals, such as \textrm{Na}$_{\mathrm{3}}%
$\textrm{Bi} and \textrm{Cd}$_{\mathrm{2}}$\textrm{As}$_{\mathrm{3}}$, are
discovered to carry $\mathbb{Z}_{2}$ monopole charges. We present an
exp... | cond-mat_mes-hall |
Andreev-Coulomb Drag in Coupled Quantum Dots: The Coulomb drag effect has been observed as a tiny current induced by both
electron-hole asymmetry and interactions in normal coupled quantum dot devices.
In the present work we show that the effect can be boosted by replacing one of
the normal electrodes by a superconduct... | cond-mat_mes-hall |
Effects of mechanical rotation on spin currents: We study the Pauli--Schr\"odinger equation in a uniformly rotating frame of
reference to describe a coupling of spins and mechanical rotations. The
explicit form of the spin-orbit interaction (SOI) with the inertial effects due
to the mechanical rotation is presented. We... | cond-mat_mes-hall |
Tunable terahertz radiation from graphene induced by moving electrons: Based on a structure consisting of a single graphene layer situated on a
periodic dielectric grating, we show theoretically that intense terahertz (THz)
radiations can be generated by an electron bunch moving atop the graphene
layer. The underlying ... | cond-mat_mes-hall |
Metamorphosis of Andreev bound states into Majorana bound states in
pristine nanowires: We show theoretically that in the generic finite chemical potential
situation, the clean superconducting spin-orbit-coupled nanowire has two
distinct nontopological regimes as a function of Zeeman splitting (below the
topological ... | cond-mat_mes-hall |
Cyclotron resonance of single valley Dirac fermions in gapless HgTe
quantum well: We report on Landau level spectroscopy studies of two HgTe quantum wells
(QWs) near or at the critical well thickness, where the band gap vanishes. In
magnetic fields up to $B$=16T, oriented perpendicular to the QW plane, we
observe a $... | cond-mat_mes-hall |
Quantum anomalies in nodal line semimetals: Topological semimetals is a new class of condensed matter systems with
nontrivial electronic structure topology. Their unusual observable properties
may often be understood in terms of quantum anomalies. In particular, Weyl and
Dirac semimetals, which have point band touching... | cond-mat_mes-hall |
Magnetotransport properties of granular oxide-segregated CoPtCr films
for applications in future magnetic memory technology: Magnetotransport properties of granular oxide-segregated CoPtCr films were
studied on both macroscopic and microscopic length scales by performing bulk
and point-contact magnetoresistance measu... | cond-mat_mes-hall |
Generating surface states in a Weyl semi-metal by applying
electromagnetic radiation: We show that the application of circularly polarized electromagnetic
radiation on the surface of a Weyl semi-metal can generate states at that
surface. These states can be characterized by their surface momentum. The
Floquet eigenva... | cond-mat_mes-hall |
Extending the spin excitation lifetime of a magnetic molecule on a
proximitized superconductor: Magnetic molecules deposited on surfaces are a promising platform to
individually address and manipulate spins. Long spin excitation lifetimes are
necessary to utilize them in quantum information processing and data storag... | cond-mat_mes-hall |
Valley-selective exciton bistability in a suspended monolayer
semiconductor: We demonstrate robust power- and wavelength-dependent optical bistability in
fully suspended monolayers of WSe2 near the exciton resonance. Bistability has
been achieved under continuous-wave optical excitation at an intensity level of
10^3 ... | cond-mat_mes-hall |
Overlapping Andreev states in semiconducting nanowires: competition of
1D and 3D propagation: The recent proposals of devices with overlapping Andreev bound states (ABS)
open up the opportunities to control and fine-tune their spectrum, that can be
used in various applications. In this Article, we study the ABS in a ... | cond-mat_mes-hall |
Anomalous Thermal Transport in Quantum Wires: We study thermal transport in a one-dimensional quantum wire, connected to
reservoirs. Despite of the absence of electron backscattering, interactions in
the wire strongly influence thermal transport. Electrons propagate with unitary
transmission through the wire and electr... | cond-mat_mes-hall |
Transport through quantum spin Hall insulator/metal junctions in
graphene ribbons: Quantum spin Hall insulator/metal interfaces are formed in graphene ribbons
with intrinsic spin-orbit coupling by selectively doping two regions creating a
potential step. For a clean graphene ribbon, the transmission of the
topologica... | cond-mat_mes-hall |
Switching 2D Magnetic States via Pressure Tuning of Layer Stacking: The physical properties of two-dimensional van der Waals (2D vdW) crystals
depend sensitively on the interlayer coupling, which is intimately connected to
the stacking arrangement and the interlayer spacing. For example, simply
changing the twist angle... | cond-mat_mes-hall |
Tunable strong coupling of mechanical resonance between spatially
separated FePS$_3$ nanodrums: Coupled nanomechanical resonators made of two-dimensional materials are
promising for processing information with mechanical modes. However, the
challenge for these types of systems is to control the coupling. Here, we
dem... | cond-mat_mes-hall |
Polarization bistability and resultant spin rings in semiconductor
microcavities: The transmission of a pump laser resonant with the lower polariton branch of
a semiconductor microcavity is shown to be highly dependent on the degree of
circular polarization of the pump. Spin dependent anisotropy of
polariton-polarito... | cond-mat_mes-hall |
Moderate bandgap and high carrier mobility simultaneously realized in
bilayer silicene by oxidation: Semiconductors simultaneously possessing high carrier mobility, moderate
bandgap, and ambient environment stability are so important for the modern
industry, and Si-based semiconducting materials can match well with t... | cond-mat_mes-hall |
Full Counting Statistics of a Non-adiabatic Electron Pump: Non-adiabatic charge pumping through a single-level quantum dot with
periodically modulated parameters is studied theoretically. By means of a
quantum-master-equation approach the full counting statistics of the system is
obtained. We find a trinomial-probabili... | cond-mat_mes-hall |
Step-like features on caloric effects of graphenes: We considered a graphene nano-ribbon with a longitudinal electric field
(along $x$ direction) and a transversal magnetic field (along $z$ direction),
and then observe (i) the electrocaloric effect ruled by an applied magnetic
field and (ii) the magnetocaloric effect r... | cond-mat_mes-hall |
Size-dependent spatial magnetization profile of manganese-zinc ferrite
Mn0.2Zn0.2Fe2.6O4 nanoparticles: We report the results of an unpolarized small-angle neutron scattering (SANS)
study on Mn-Zn ferrite (MZFO) magnetic nanoparticles with the aim to elucidate
the interplay between their particle size and the magneti... | cond-mat_mes-hall |
Near-field infrared nano-spectroscopy of surface phonon-polariton
resonances: We present combined experimental and numerical work on light-matter
interactions at nanometer length scales. We report novel numerical simulations
of near-field infrared nanospectroscopy that consider, for the first time,
detailed tip geome... | cond-mat_mes-hall |
Instanton Approach to Josephson Tunneling between Trapped Condensates: An instanton method is proposed to investigate the quantum tunneling between
two weakly-linked Bose-Einstein condensates confined in double-well potential
traps. We point out some intrinsic pathologies in the earlier treatments of
other authors and ... | cond-mat_mes-hall |
Universal dephasing in a chiral 1D interacting fermion system: We consider dephasing by interactions in a one-dimensional chiral fermion
system (e.g. a Quantum Hall edge state). For finite-range interactions, we
calculate the spatial decay of the Green's function at fixed energy, which sets
the contrast in a Mach-Zehnd... | cond-mat_mes-hall |
Acoustic plasmons in graphene sandwiched between two metallic slabs: We study the effect of two metallic slabs on the collective dynamics of
electrons in graphene positioned between the two slabs. We show that if the
slabs are perfect conductors the plasmons of graphene display a linear
dispersion relation. The velocit... | cond-mat_mes-hall |
Flat bands and chiral optical response of moiré insulators: We present a low-energy model describing the reconstruction of the electronic
spectrum in twisted bilayers of honeycomb crystals with broken sublattice
symmetry. The resulting moir\'e patterns are classified into two families with
different symmetry. In both c... | cond-mat_mes-hall |
Field-effect tunneling transistor based on vertical graphene
heterostructures: We report a bipolar field effect tunneling transistor that exploits to
advantage the low density of states in graphene and its one atomic layer
thickness. Our proof-of-concept devices are graphene heterostructures with
atomically thin boro... | cond-mat_mes-hall |
Interference of diffusing photons and level crossing spectroscopy: We show that a new interference effect appears in the intensity fluctuations
of photons multiply scattered by an atomic gas of large optical depth b. This
interference occurs only for scattering atoms that are Zeeman degenerate and it
leads to a deviati... | cond-mat_mes-hall |
Disorder-mediated Kondo effect in graphene: We study the emergence of strongly correlated states and Kondo physics in
disordered graphene. Diluted short range disorder gives rise to localized
midgap states at the vicinity of the system charge neutrality point. We show
that long-range disorder, ubiquitous in graphene, a... | cond-mat_mes-hall |
Giant excitonic magneto-optical Faraday rotation in single semimagnetic
CdTe/Cd_{1-x}Mn_{x}Te quantum ring: Magnetic tuning of the bound exciton states and corresponding giant Zeeman
splitting (GZS) between {\sigma}^{+} and {\sigma}^{-} excitonic transitions in
CdTe/Cd_{1-x}Mn_{x}Te quantum ring has been investigated... | cond-mat_mes-hall |
Topological qubits in graphenelike systems: The fermion-doubling problem can be an obstacle to getting half-a-qubit in
two-dimensional fermionic tight-binding models in the form of Majorana zero
modes bound to the core of superconducting vortices. We argue that the number
of such Majorana zero modes is determined by a ... | cond-mat_mes-hall |
Novel mechanisms to enhance the capacitance beyond the classical limits
in capacitors with free-electron-like electrodes: The so-called negative electron compressibility refers to the lowering of the
chemical potential of a metallic system when the carrier density increases.
This effect has often been invoked in the ... | cond-mat_mes-hall |
Valley degeneracy in biaxially strained aluminum arsenide quantum wells: This paper details a complete formalism for calculating electron subband
energy and degeneracy in strained multi-valley quantum wells grown along any
orientation with explicit results for the AlAs quantum well case. A
standardized rotation matrix ... | cond-mat_mes-hall |
Kinetics of Exciton Emission Patterns and Carrier Transport: We report on the measurements of the kinetics of expanding and collapsing
rings in the exciton emission pattern. The rings are found to preserve their
integrity during expansion and collapse, indicating that the observed kinetics
is controlled by charge carri... | cond-mat_mes-hall |
Heat transport in harmonic lattices: We work out the non-equilibrium steady state properties of a harmonic lattice
which is connected to heat reservoirs at different temperatures. The heat
reservoirs are themselves modeled as harmonic systems. Our approach is to write
quantum Langevin equations for the system and solve... | cond-mat_mes-hall |
Scaling for rectification of bipolar nanopores as a function of a
modified Dukhin number: the case of 1:1 electrolytes: The scaling behavior for the rectification of bipolar nanopores is studied
using the Nernst-Planck equation coupled to the Local Equilibrium Monte Carlo
method. The bipolar nanopore's wall carries $... | cond-mat_mes-hall |
Scaling properties of induced density of chiral and non-chiral Dirac
fermions in magnetic fields: We find that a repulsive potential of graphene in the presence of a magnetic
field has bound states that are peaked inside the barrier with tails extending
over \ell(N + 1), where \ell and N are the magnetic length and L... | cond-mat_mes-hall |
Minimal model for charge transfer excitons at the dielectric interface: Theoretical description of the charge transfer (CT) exciton across the
donor-acceptor interface without the use of a completely localized hole (or
electron) is a challenge in the field of organic solar cells. We calculate the
total wavefunction of ... | cond-mat_mes-hall |
Robustness of the quantum Hall effect, sample size versus sample
topology, and quality control management of III-V molecular beam epitaxy: We measure the IQHE on macroscopic (1.5cm x 1.5cm) "quick 'n' dirty" prepared
III-V heterostructure samples with van der Pauw and modified Corbino geometries
at 1.3 K. We compare ... | cond-mat_mes-hall |
Realization of a Laughlin quasiparticle interferometer: Observation of
fractional statistics: In two dimensions, the laws of physics permit existence of anyons, particles
with fractional statistics which is neither Fermi nor Bose. That is, upon
exchange of two such particles, the quantum state of a system acquires a ... | cond-mat_mes-hall |
Double refraction and spin splitter in a normal-hexagonal semiconductor
junction: In analogy with light refraction at optical boundary, ballistic electrons
also undergo refraction when propagate across a semiconductor junction.
Establishing a negative refractive index in conventional optical materials is
difficult, b... | cond-mat_mes-hall |
Electron quantum dynamics in closed and open potentials at high magnetic
fields: Quantization and lifetime effects unified by semicoherent states: We have developed a Green's function formalism based on the use of an
overcomplete semicoherent basis of vortex states, specially devoted to the
study of the Hamiltonian q... | cond-mat_mes-hall |
Generating quantizing pseudomagnetic fields by bending graphene ribbons: We analyze the mechanical deformations that are required to create uniform
pseudomagnetic fields in graphene. It is shown that, if a ribbon is bent
in-plane into a circular arc, this can lead to fields exceeding 10T, which is
sufficient for the ob... | cond-mat_mes-hall |
Dynamic frequency dependence of bias activated negative capacitance in
semiconductor diodes under high forward bias: We observed qualitatively dissimilar frequency dependence of negative
capacitive response under high charge injection in two sets of junction diodes
which are functionally different from each other i.e... | cond-mat_mes-hall |
Weak antilocalization beyond the fully diffusive regime in Pb1-xSnxSe
topological quantum wells: We report the measurements and analysis of weak antilocalization (WAL) in
Pb1-xSnxSe topological quantum wells in a new regime where the elastic
scattering length is larger than the magnetic length. We achieve this regime... | cond-mat_mes-hall |
Using single quantum states as spin filters to study spin polarization
in ferromagnets: By measuring electron tunneling between a ferromagnet and individual energy
levels in an aluminum quantum dot, we show how spin-resolved quantum states can
be used as filters to determine spin-dependent tunneling rates. We also ob... | cond-mat_mes-hall |
Quantum properties of a strongly driven Josephson junction: A Josephson junction embedded in a dissipative circuit can be externally
driven to induce nonlinear dynamics of its phase. Classically, under
sufficiently strong driving and weak damping, dynamic multi-stability emerges
associated with dynamical bifurcations s... | cond-mat_mes-hall |
Spatiotemporal spin fluctuations caused by spin-orbit-coupled Brownian
motion: We develop a theory of thermal fluctuations of spin density emerging in a
two-dimensional electron gas. The spin fluctuations probed at spatially
separated spots of the sample are correlated due to Brownian motion of
electrons and spin-obi... | cond-mat_mes-hall |
Ab initio simulation of the structure and transport properties of
zirconium and ferromagnetic cobalt contacts on the two-dimensional
semiconductor WS_2: Using density-functional theory calculations, the atomic and electronic
structure of single-layer WS_2 attached to Zr and Co contacts are determined.
Both metals f... | cond-mat_mes-hall |
Large-Scale Schrödinger-Cat States and Majorana Bound States in
Coupled Circuit-QED Systems: We have studied the low-lying excitations of a chain of coupled circuit-QED
systems, and report several intriguing properties of its two nearly degenerate
ground states. The ground states are Schr\"odinger cat states at a tru... | cond-mat_mes-hall |
High Mobility Free-Standing InSb Nanoflags Grown On InP Nanowire Stems
For Quantum Devices: High quality heteroepitaxial two-dimensional (2D) InSb layers are very
difficult to realize owing to the large lattice mismatch with other widespread
semiconductor substrates. A way around this problem is to grow free-standing... | cond-mat_mes-hall |
Thermally-Activated Phase Slips in Superfluid Spin Transport in Magnetic
Wires: We theoretically study thermally-activated phase slips in superfluid spin
transport in easy-plane magnetic wires within the stochastic
Landau-Lifshitz-Gilbert phenomenology, which runs parallel to the
Langer-Ambegaokar-McCumber-Halperin t... | cond-mat_mes-hall |
Multiphoton excitation and high harmonic generation in rectangular
graphene quantum dot: The multiphoton excitation and high harmonic generation (HHG) processes are
considered using the microscopic quantum theory of nonlinear interaction of
strong coherent electromagnetic (EM) radiation with rectangular graphene
quan... | cond-mat_mes-hall |
Commensurate and incommensurate double moiré interference in twisted
trilayer graphene: Twisted graphene multi-layers have been recently demonstrated to share
several correlation-driven behaviours with twisted bilayer graphene. In
general, the van Hove singularities (VHSs) can be used as a proxy of the
tendency for c... | cond-mat_mes-hall |
Anisotropic 2D materials for tunable hyperbolic plasmonics: Motivated by the recent emergence of a new class of anisotropic 2D materials,
we examine their electromagnetic modes and demonstrate that a broad class of
the materials can host highly directional hyperbolic plasmons. Their
propagation direction can be manipul... | cond-mat_mes-hall |
Resonant Coherent Phonon Generation in Single-Walled Carbon Nanotubes
through Near-Band-Edge Excitation: We have observed large-amplitude coherent phonon oscillations of radial
breathing modes (RBMs) in single-walled carbon nanotubes excited through the
lowest-energy (E11) interband transitions. In contrast to the
pr... | cond-mat_mes-hall |
Quantum Hall Effect in a Graphene p-n Junction: We report on the fabrication and transport studies of a single-layer graphene
p-n junction. Carrier type and density in two adjacent regions are individually
controlled by electrostatic gating using a local top gate and a global back
gate. A functionalized Al203 oxide tha... | cond-mat_mes-hall |
The dynamical bulk boundary correspondence and dynamical quantum phase
transitions in the Benalcazar-Bernevig-Hughes model: In this article we demonstrate that dynamical quantum phase transitions occur
for an exemplary higher order topological insulator, the
Benalcazar-Bernevig-Hughes model, following quenches across... | cond-mat_mes-hall |
Robust Type-II Weyl Semimetal Phase in Transition Metal Diphosphides
XP$_2$ (X = Mo, W): The recently discovered type-II Weyl points appear at the boundary between
electron and hole pockets. Type-II Weyl semimetals that host such points are
predicted to exhibit a new type of chiral anomaly and possess thermodynamic
p... | cond-mat_mes-hall |
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