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Magically strained bilayer graphene with flat bands: Twist bilayer graphenes with magical angle have nearly flat band, which
become strongly correlated electron systems. Herein, we propose another system
based on strained bilayer graphene that have flat band at the intrinsic Fermi
level. The top and bottom layers are u... | cond-mat_mes-hall |
Maxwell's demon in a double quantum dot with continuous charge detection: Converting information into work has during the last decade gained renewed
interest as it gives insight into the relation between information theory and
thermodynamics. Here we theoretically investigate an implementation of
Maxwell's demon in a d... | cond-mat_mes-hall |
Spin-Orbit gauge and quantum spin Hall effect: We have shown that the non-Abelian spin-orbit gauge field strength of the
Rashba and Dresselhaus interactions, when split into two Abelian field
strengths, the Hamiltonian of the system can be re-expressed as a Landau level
problem with a particular relation between the tw... | cond-mat_mes-hall |
Detecting magneto-optical interactions in nanostructures: Effects due to magneto-optical interactions are responsible for most of the
phenomena discovered in optoelectronics and spintronics. Magneto-optical
interactions can generate elementary excitations of the order of light-magnetic
matter, which can flow under cert... | cond-mat_mes-hall |
Delta-T noise for fractional quantum Hall states at different filling
factor: The current fluctuations due to a temperature bias, i.e. the delta-$T$ noise,
allow one to access properties of strongly interacting systems which cannot be
addressed by the usual voltage-induced noise. In this work, we study the full
delta... | cond-mat_mes-hall |
The spin Hall effect: In metallic systems with spin-orbit coupling a longitudinal charge current
may generate a transverse pure spin current; vice-versa an injected pure spin
current may result in a transverse charge current. Such direct and inverse spin
Hall effects share the same microscopic origin: intrinsic band/de... | cond-mat_mes-hall |
Quantum many-body simulation using monolayer exciton-polaritons in
coupled-cavities: Quantum simulation is a promising approach to understand complex strongly
correlated many-body systems using relatively simple and tractable systems.
Photon-based quantum simulators have great advantages due to the possibility of
dir... | cond-mat_mes-hall |
Analytic approach to the edge state of the Kane-Mele Model: We investigate the edge state of a two-dimensional topological insulator
based on the Kane-Mele model. Using complex wave numbers of the Bloch wave
function, we derive an analytical expression for the edge state localized near
the edge of a semi-infinite honey... | cond-mat_mes-hall |
Unravelling the electrical properties of epitaxial Graphene nanoribbons: The size-dependent electrical resistivity of single-layer graphene ribbons
has been studied experimentally for ribbon widths from 16 nm to 320 nm. The
experimental findings are that the resistivity follows a more dramatic trend
than that seen for ... | cond-mat_mes-hall |
Optical manipulation of nuclear spin by a two-dimensional electron gas: Conduction electrons are used to optically polarize, detect and manipulate
nuclear spin in a (110) GaAs quantum well. Using optical Larmor magnetometry,
we find that nuclear spin can be polarized along or against the applied
magnetic field, dependi... | cond-mat_mes-hall |
Classification of Exceptional Nodal Topologies Protected by
$\mathcal{PT}$ Symmetry: Exceptional degeneracies, at which both eigenvalues and eigenvectors
coalesce, and parity-time ($\mathcal{PT}$) symmetry, reflecting balanced gain
and loss in photonic systems, are paramount concepts in non-Hermitian systems.
We here... | cond-mat_mes-hall |
Dynamical characterization of Weyl nodes in Floquet Weyl semimetal
phases: Due to studies in nonequilibrium (periodically-driven) topological matter, it
is now understood that some topological invariants used to classify equilibrium
states of matter do not suffice to describe their nonequilibrium counterparts.
Indeed... | cond-mat_mes-hall |
Electron transport through molecular bridge systems: Electron transport characteristics are investigated through some molecular
chains attached to two non-superconducting electrodes by the use of Green's
function method. Here we do parametric calculations based on the tight-binding
formulation to characterize the elect... | cond-mat_mes-hall |
Nonlocal Response and Anamorphosis: the Case of Few-Layer Black
Phosphorus: Few-layer black phosphorus was recently rediscovered as a narrow-bandgap
atomically thin semiconductor and has already attracted unprecedented attention
due to its interesting properties. One feature of this material that sets it
apart from o... | cond-mat_mes-hall |
Magnonic bending, phase shifting and interferometry in a 2D
reconfigurable nanodisk crystal: Strongly-interacting nanomagnetic systems are pivotal across next-generation
technologies including reconfigurable magnonics and neuromorphic computation.
Controlling magnetisation state and local coupling between neighbourin... | cond-mat_mes-hall |
Continuum model for chiral induced spin selectivity in helical molecules: A minimal model is exactly solved for electron spin transport on a helix.
Electron transport is assumed to be supported by well oriented $p_z$ type
orbitals on base molecules forming a staircase of definite chirality. In a
tight binding interpret... | cond-mat_mes-hall |
Pauli spin blockade in weakly coupled quantum dots: In a two-level system, constituted by two serially coupled single level
quantum dots, coupled to external leads we find that the current is suppressed
in one direction of biasing caused by a fully occupied two-electron triplet
state in the interacting region. The effi... | cond-mat_mes-hall |
Charge Relaxation and Dephasing in Coulomb Coupled Conductors: The dephasing time in coupled mesoscopic conductors is caused by the
fluctuations of the dipolar charge permitted by the long range Coulomb
interaction. We relate the phase breaking time to elementary transport
coefficients which describe the dynamics of th... | cond-mat_mes-hall |
Spatial patterns of dissipative polariton solitons in semiconductor
microcavities: Semiconductor microcavities operating in the polaritonic regime are highly
non-linear, high speed systems due to the unique half-light, half-matter nature
of polaritons. Here, we report for the first time the observation of
propagating... | cond-mat_mes-hall |
Reversible edge spin currents in antiferromagnetically proximitized
dichalcogenides: We explore proximity effects on transition metal dichalcogenide ribbons
deposited on antiferromagnetic (AFM) insulating substrates. We model these
hybrid heterostructures using a tight-binding model that incorporates exchange
and Ras... | cond-mat_mes-hall |
Arbitrary qubit transformations on tuneable Rashba rings: An exact solution is presented for the time-dependent wavefunction of a
Kramers doublet which propagates around a quantum ring with tuneable Rashba
spin-orbit interaction. By propagating in segments it is shown that
Kramers-doublet qubits may be defined for whic... | cond-mat_mes-hall |
Current-induced switching in transport through anisotropic magnetic
molecules: Anisotropic single-molecule magnets may be thought of as molecular switches,
with possible applications to molecular spintronics. In this paper, we consider
current-induced switching in single-molecule junctions containing an
anisotropic m... | cond-mat_mes-hall |
Control of nonlocal magnon spin transport via magnon drift currents: Spin transport via magnon diffusion in magnetic insulators is important for a
broad range of spin-based phenomena and devices. However, the absence of the
magnon equivalent of an electric force is a bottleneck. In this work, we
demonstrate the control... | cond-mat_mes-hall |
Dephasing by extremely dilute magnetic impurities revealed by
Aharonov-Bohm oscillations: We have probed the magnetic field dependence of the electron phase coherence
time $\tau_\phi$ by measuring the Aharonov-Bohm conductance oscillations of
mesoscopic Cu rings. Whereas $\tau_\phi$ determined from the low-field
magn... | cond-mat_mes-hall |
States near Dirac points of rectangular graphene dot in a magnetic field: In neutral graphene dots the Fermi level coincides with the Dirac points. We
have investigated in the presence of a magnetic field several unusual
properties of single electron states near the Fermi level of such a
rectangular-shaped graphene dot... | cond-mat_mes-hall |
Adiabatic and local approximations for the Kohn-Sham potential in
time-dependent Hubbard chains: We obtain the exact Kohn-Sham potentials $V_{\mathrm{KS}}$ of time-dependent
density-functional theory for 1D Hubbard chains, driven by a d.c.\ external
field, using the time-dependent electron density and current density... | cond-mat_mes-hall |
Ultrafast Quantum-path Interferometry Revealing the Generation Process
of Coherent Phonons: Optical dual-pulse pumping actively creates quantum-mechanical superposition
of the electronic and phononic states in a bulk solid. We here made transient
reflectivity measurements in an n-GaAs using a pair of relative-phase-l... | cond-mat_mes-hall |
Carbon nanotube: a low-loss spin-current waveguide: We demonstrate with a quantum-mechanical approach that carbon nanotubes are
excellent spin-current waveguides and are able to carry information stored in a
precessing magnetic moment for long distances with very little dispersion and
with tunable degrees of attenuatio... | cond-mat_mes-hall |
Imaging coherent electron wave flow in a two-dimensional electron gas: We measure the energy distribution of electrons passing through a
two-dimensional electron gas using a scanning probe microscope. We present
direct spatial images of coherent electron wave flow from a quantum point
contact formed in a GaAs/AlGaAs tw... | cond-mat_mes-hall |
Magneto-resistance quantum oscillations in a magnetic two-dimensional
electron gas: Magneto-transport measurements of Shubnikov-de Haas (SdH) oscillations have
been performed on two-dimensional electron gases (2DEGs) confined in CdTe and
CdMnTe quantum wells. The quantum oscillations in CdMnTe, where the 2DEG
interac... | cond-mat_mes-hall |
Minigap and Andreev bound states in ballistic graphene: A finite-size normal conductor, proximity-coupled to a superconductor has
been predicted to exhibit a so-called minigap, in which quasiparticle
excitations are prohibited. Here, we report on the direct observation of such a
minigap in ballistic graphene, coupled t... | cond-mat_mes-hall |
Quantum Plasmonic Nanoantennas: We study plasmonic excitations in the limit of few electrons, in one-atom
thick sodium chains, and characterize them based on collectivity. We also
compare the excitations to classical localised plasmon modes and find for the
longitudinal mode a quantum-classical transition around 10 ato... | cond-mat_mes-hall |
Spin-singlet hierarchy in the fractional quantum Hall effect: We show that the so-called permanent quantum Hall states are formed by the
integer quantum Hall effects on the Haldane-Rezayi quantum Hall state. Novel
conformal field theory description along with this picture is deduced. The odd
denominator plateaux observ... | cond-mat_mes-hall |
Graphene Transistor as a Probe for Streaming Potential: We explore the dependence of electrical transport in a graphene field effect
transistor (GraFET) on the flow of the liquid within the immediate vicinity of
that transistor. We find large and reproducible shifts in the charge neutrality
point of GraFETs that are de... | cond-mat_mes-hall |
Photovoltaic performances in a cavity-coupled double quantum dots
photocell: Revealing the quantum regime of photovoltaics is crucial to enhancing the
internal quantum efficiency of a double quantum dots (DQDs) photocell housed in
a cavity. In this study, the performance of a quantum photovoltaic is evaluated
based o... | cond-mat_mes-hall |
Superoperator nonequilibrium Green's function theory of many-body
systems; Applications to charge transfer and transport in open junctions: Nonequilibrium Green's functions provide a powerful tool for computing the
dynamical response and particle exchange statistics of coupled quantum systems.
We formulate the theory... | cond-mat_mes-hall |
Bichromatic Rabi control of semiconductor qubits: Electrically-driven spin resonance is a powerful technique for controlling
semiconductor spin qubits. However, it faces challenges in qubit addressability
and off-resonance driving in larger systems. We demonstrate coherent
bichromatic Rabi control of quantum dot hole s... | cond-mat_mes-hall |
Thermally activated intersubband scattering and oscillating
magnetoresistance in quantum wells: Experimental studies of magnetoresistance in high-mobility wide quantum wells
reveal oscillations which appear with an increase in temperature to 10 K and
whose period is close to that of Shubnikov-de Haas oscillations. Th... | cond-mat_mes-hall |
Dirac-Harper Theory for One Dimensional Moiré Superlattices: We study a Dirac Harper model for moir\'e bilayer superlattices where layer
antisymmetric strain periodically modulates the interlayer coupling between two
honeycomb lattices in one spatial dimension. Discrete and continuum
formulations of this model are anal... | cond-mat_mes-hall |
Opto-Electronic Characterization of Three Dimensional Topological
Insulators: We demonstrate that the terahertz/infrared radiation induced photogalvanic
effect, which is sensitive to the surface symmetry and scattering details, can
be applied to study the high frequency conductivity of the surface states in
(Bi1-xSbx... | cond-mat_mes-hall |
Ground-state quantum geometry in superconductor-quantum dot chains: Multiterminal Josephson junctions constitute engineered topological systems
in arbitrary synthetic dimensions defined by the superconducting phases.
Microwave spectroscopy enables the measurement of the quantum geometric tensor,
a fundamental quantity ... | cond-mat_mes-hall |
Hole Spin Coherence in a Ge/Si Heterostructure Nanowire: Relaxation and dephasing of hole spins are measured in a gate-defined Ge/Si
nanowire double quantum dot using a fast pulsed-gate method and dispersive
readout. An inhomogeneous dephasing time $T_2^* \sim 0.18~\mathrm{\mu s}$
exceeds corresponding measurements in ... | cond-mat_mes-hall |
Orbital Magnetism of Graphene Nanostructures: Bulk and Confinement
Effects: We consider the orbital magnetic properties of non-interacting charge
carriers in graphene-based nanostructures in the low-energy regime. The
magnetic response of such systems results both, frombulk contributions and from
confinement effects ... | cond-mat_mes-hall |
Spin-orbit interactions mediated negative differential resistance in a
quasi-two-dimensional electron gas with finite thickness: Effects of the spin-orbit interactions on the energy spectrum, Fermi surface
and spin dynamics are studied in structural- and bulk-inversion asymmetric
quasi-two-dimensional structures with... | cond-mat_mes-hall |
Modulation theory of quantum tunneling into a Calogero-Sutherland fluid: Quantum hydrodynamics of interacting electrons with a parabolic single
particle spectrum is studied using the Calogero-Sutherland model. The effective
action and modulation equations, describing evolution of periodic excitations
in the fluid, are ... | cond-mat_mes-hall |
Purcell effect at metal-insulator transitions: We investigate the spontaneous emission rate of a two-level quantum emitter
next to a composite medium made of randomly distributed metallic inclusions
embedded in a dielectric host matrix. In the near-field, the Purcell factor can
be enhanced by two-orders of magnitude re... | cond-mat_mes-hall |
Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene
Superlattices: Van der Waals (vdW) heterostructures are an emergent class of metamaterials
comprised of vertically stacked two-dimensional (2D) building blocks, which
provide us with a vast tool set to engineer their properties on top of the
alrea... | cond-mat_mes-hall |
Enhanced thermoelectric response in the fractional quantum Hall effect: We study the linear thermoelectric response of a quantum dot embedded in a
constriction of a quantum Hall bar with fractional filling factors nu=1/m
within Laughlin series. We calculate the figure of merit ZT for the maximum
efficiency at a fixed t... | cond-mat_mes-hall |
Spin soliton of Holstein model with spin-orbit coupling in
one-dimensional conjugated polymers: For Holstein model with Rashba spin-orbit coupling (SOC) we establish the
nonlinear Schr\"odinger equations and obtain exact soliton solution
analytically. It is found that the soliton is spin polarized determined both by
... | cond-mat_mes-hall |
Transport signatures of symmetry protection in 1D Floquet topological
insulators: Time-periodic external drives have emerged as a powerful tool to artificially
create topological phases of matter. Prime examples are Floquet topological
insulators (FTIs), where a gapped bulk supports in-gap edge states, protected
agai... | cond-mat_mes-hall |
Effective Hamiltonians in the Quantum Rabi Problem: We revisit the theoretical description of the ultrastrong light-matter
interaction in terms of exactly solvable effective Hamiltonians. A perturbative
approach based on polaronic and spin-dependent squeezing transformations
provides an effective Hamiltonian for the qu... | cond-mat_mes-hall |
All-electron GW calculation for molecules: Ionization energy and
electron affinity of conjugated molecules: An efficient all-electron G$^0$W$^0$ method and a quasiparticle
selfconsistent GW (QSGW) method for molecules are proposed in the molecular
orbital space with the full random phase approximation. The convergenc... | cond-mat_mes-hall |
Through-membrane electron-beam lithography for ultrathin membrane
applications: We present a technique to fabricate ultrathin (down to 20 nm) uniform
electron transparent windows at dedicated locations in a SiN membrane for in
situ transmission electron microscopy experiments. An electron-beam (e-beam)
resist is spra... | cond-mat_mes-hall |
Tunable optical nonlinearity for TMD polaritons dressed by a Fermi sea: We study a system of a transition metal dichalcogenide (TMD) monolayer placed
in an optical resonator, where strong light-matter coupling between excitons
and photons is achieved. We present quantitative theory of the nonlinear
optical response for... | cond-mat_mes-hall |
New Multi-Scale Simulation Framework for Next-Generation Electronic
Design Automation with Application to the Junctionless Transistor: In this paper we present a new multi-scale simulation scheme for
next-generation electronic design automation for nano-electronics. The scheme
features a combination of the first-prin... | cond-mat_mes-hall |
Dual-gated hBN/bilayer-graphene superlattices and the transitions
between the insulating phases at the charge neutrality point: We report on transport properties in dual-gated hexagonal boron nitride
(hBN)/bilayer-graphene (BLG) superlattices. Here, BLG is nontwisted, i.e.,
plain. This paper focuses on the charge neu... | cond-mat_mes-hall |
Organic single-photon switch: The recent progress in nanotechnology [1,2] and single-molecule spectroscopy
[3-5] paves the way for cost-effective organic quantum optical technologies
emergent with a promise to real-life devices operating at ambient conditions.
In this letter, we harness $\pi$-conjugated segments of an ... | cond-mat_mes-hall |
Optical nanoscopy via quantum control: We present a scheme for nanoscopic imaging of a quantum mechanical two-level
system using an optical probe in the far-field. Existing super-resolution
schemes require more than two-levels and depend on an incoherent response to
the lasers. Here, quantum control of the two states p... | cond-mat_mes-hall |
Strain-induced pseudomagnetic and scalar fields in symmetry-enforced
Dirac nodes: It is known that Dirac nodes can be present at high-symmetry points of
Brillouin zone only for certain space groups. For these cases, the effect of
strain is treated by symmetry considerations. The dependence of strain-induced
potential... | cond-mat_mes-hall |
Chargeless spin current for switching and coupling of domain walls in
magnetic nanowires: The demonstration of the generation and control of a pure spin current
(without net charge flow) by electric fields and/or temperature gradient has
been an essential leap in the quest for low-power consumption electronics. The
k... | cond-mat_mes-hall |
Single-Particle-Picture Breakdown in laterally weakly confining GaAs
Quantum Dots: We present a detailed investigation of different excitonic states weakly
confined in single GaAs/AlGaAs quantum dots obtained by the Al droplet-etching
method. For our analysis we make use of temperature-, polarization- and
magnetic fi... | cond-mat_mes-hall |
Magnetic Structure of Nano-Graphite Moebius Ribbon: We consider the electronic and magnetic properties of nanographite ribbon
with zigzag edges under the periodic or Moebius boundary conditions. The zigzag
nano-graphite ribbons possess edge localized states at the Fermi level which
cause a ferrimagnetic spin polarizati... | cond-mat_mes-hall |
Valley-Polarized Quantum Anomalous Hall State in Moiré
MoTe$_2$/WSe$_2$ Heterobilayers: Moir\'e heterobilayer transition metal dichalcogenides (TMDs) emerge as an
ideal system for simulating the single-band Hubbard model and interesting
correlated phases have been observed in these systems. Nevertheless, the
moir\'e ... | cond-mat_mes-hall |
Theoretical Description of Scanning Tunneling Potentiometry: A theoretical description of scanning tunneling potentoimetry (STP)
measurement is presented to address the increasing need for a basis to
interpret experiments on macrscopic samples. Based on a heuristic understanding
of STP provided to facilitate theoretica... | cond-mat_mes-hall |
Anisotropic thermoelectric effect in helimagnetic tunnel junctions: Thermoelectric transport across
normal-metal/helical-multiferroic/ferromagnetic heterojunctions is
theoretically investigated. We find a anisotropic charge and spin thermopower
with a $C_{2v}$ symmetry. The angular dependence on the magnetization
orien... | cond-mat_mes-hall |
Magnetoresistance in the in-plane magnetic field induced semi-metallic
phase of inverted HgTe quantum wells: In this study we have measured the magnetoresistance response of inverted
HgTe quantum wells in the presence of a large parallel magnetic field up to 33
T is applied. We show that in quantum wells with inverte... | cond-mat_mes-hall |
Electronic structure of graphene on single crystal copper substrates: The electronic structure of graphene on Cu(111) and Cu(100) single crystals
is investigated using low energy electron microscopy, low energy electron
diffraction and angle resolved photoemission spectroscopy. On both substrates
the graphene is rotati... | cond-mat_mes-hall |
Semiclassical Theory for Decay and Fragmentation Processes in Chaotic
Quantum Systems: We consider quantum decay and photofragmentation processes in open chaotic
systems in the semiclassical limit. We devise a semiclassical approach which
allows us to consistently calculate quantum corrections to the classical decay
... | cond-mat_mes-hall |
Midinfrared Third Harmonic Generation from Macroscopically Aligned
Ultralong Single-Wall Carbon Nanotubes: We report the observation of strong third harmonic generation from a
macroscopic array of aligned ultralong single-wall carbon nanotubes (SWCNTs)
with intense midinfrared radiation. Through power-dependent exper... | cond-mat_mes-hall |
Do the Size Effects Exist?: In this short paper we review a series of publications, some of which are our
own, where various aspects of size effects were examined. By analyzing a series
of examples we show that various intensive macroscopic characteristics of
nanoobjects exhibit non-trivial size dependencies on the sca... | cond-mat_mes-hall |
Superconductor-semiconductor magnetic microswitch: A hybrid superconductor--two-dimensional electron gas microdevice is
presented. Its working principle is based on the suppression of Andreev
reflection at the superconductor-semiconductor interface caused by a magnetic
barrier generated by a ferromagnetic strip placed ... | cond-mat_mes-hall |
Influence of vibrational modes on the electronic properties of DNA: We investigate the electron (hole) transport through short double-stranded
DNA wires in which the electrons are strongly coupled to the specific
vibrational modes (vibrons) of the DNA. We analyze the problem starting from a
tight-binding model of DNA, ... | cond-mat_mes-hall |
Giant Microwave Sensitivity of Magnetic Array by Long-Range Chiral
Interaction Driven Skin Effect: Non-Hermitian skin effect was observed in one-dimensional systems with
short-range chiral interaction. Long-range chiral interaction mediated by
traveling waves also favors the accumulation of energy, but has not yet sh... | cond-mat_mes-hall |
Generating indistinguishable photons from a quantum dot in a noisy
environment: Single photons from semiconductor quantum dots are promising resources for
linear optical quantum computing, or, when coupled to spin states, quantum
repeaters. To realize such schemes, the photons must exhibit a high degree of
indistingu... | cond-mat_mes-hall |
Cavity optomechanical transduction sensing of single molecules: We report narrow linewidth optomechanical oscillation of a silica microsphere
immersed in a buffer solution. Through a novel optomechanical transduction
sensing approach, single 10-nm-radius silica beads and Bovine serum albumin
(BSA) protein molecules wit... | cond-mat_mes-hall |
Non-Hermitian Lindhard function and Friedel oscillations: The Lindhard function represents the basic building block of many-body
physics and accounts for charge response, plasmons, screening, Friedel
oscillation, RKKY interaction etc. Here we study its non-Hermitian version in
one dimension, where quantum effects are t... | cond-mat_mes-hall |
The effects of a magnetic barrier and a nonmagnetic spacer in tunnel
structures: The spin-polarized transport is investigated in a new type of magnetic tunnel
junction which consists of two ferromagnetic electrodes separated by a magnetic
barrier and a nonmagnetic metallic spacer. Based on the transfer matrix method
... | cond-mat_mes-hall |
Mode- and size-dependent Landau-Lifshitz damping in magnetic
nanostructures: Evidence for non-local damping: We demonstrate a strong dependence of the effective damping on the nanomagnet
size and the particular spin-wave mode that can be explained by the theory of
intralayer transverse-spin-pumping. The effective Lan... | cond-mat_mes-hall |
Resistivity of Graphene Nanoribbon Interconnects: Graphene nanoribbon interconnects are fabricated, and the extracted
resistivity is compared to that of Cu. It is found that the average resistivity
at a given line-width (18nm<W<52nm) is about 3X that of a Cu wire, whereas the
best GNR has a resistivity comparable to th... | cond-mat_mes-hall |
Resistivity anisotropy of quantum Hall stripe phases: Quantum Hall stripe phases near half-integer filling factors $\nu \ge 9/2$
were predicted by Hartree-Fock (HF) theory and confirmed by discoveries of
giant resistance anisotropies in high-mobility two-dimensional electron gases.
A theory of such anisotropy was propo... | cond-mat_mes-hall |
Dephasing of a particle in a dissipative environment: The motion of a particle in a ring of length L is influenced by a dirty metal
environment whose fluctuations are characterized by a short correlation
distance $\ell << L$. We analyze the induced decoherence process, and compare
the results with those obtained in the... | cond-mat_mes-hall |
Intercalated Rare-Earth Metals under Graphene on SiC: Intercalation of rare earth metals ($RE$ = Eu, Dy, and Gd) is achieved by
depositing the $RE$ metal on graphene that is grown on silicon-carbide (SiC)
and by subsequent annealing at high temperatures to promote intercalation. STM
images of the films reveal that the ... | cond-mat_mes-hall |
Hot carriers in a bipolar graphene: Hot carriers in a doped graphene under dc electric field is described taking
into account the intraband energy relaxation due to acoustic phonon scattering
and the interband generation-recombination transitions caused by thermal
radiation. The consideration is performed for the case ... | cond-mat_mes-hall |
Magnetic-Field-Dependent Thermodynamic Properties of Square and
Quadrupolar Artificial Spin Ice: Applied magnetic fields are an important tuning parameter for artificial spin
ice (ASI) systems, as they can drive phase transitions between different
magnetic ground states, or tune through regimes with high populations ... | cond-mat_mes-hall |
Effective interfacial Dzyaloshinskii-Moriya interaction and skyrmion
stabilization in ferromagnet/paramagnet and ferromagnet/superconductor hybrid
systems: It is shown that a term in the form of Dzyaloshinskii-Moriya interaction
(DMI) contributes to the free energy of a ferromagnetic (FM) film on a
paramagnetic (PM... | cond-mat_mes-hall |
A Movable Valley Switch Driven by Berry Phase in Bilayer Graphene
Resonators: Since its discovery, Berry phase has been demonstrated to play an important
role in many quantum systems. In gapped Bernal bilayer graphene, the Berry
phase can be continuously tuned from zero to 2pi, which offers a unique
opportunity to ex... | cond-mat_mes-hall |
Theory of the plasma-wave photoresponse of a gated graphene sheet: The photoresponse of graphene has recently received considerable attention.
The main mechanisms yielding a finite dc response to an oscillating radiation
field which have been investigated include responses of photovoltaic,
photo-thermoelectric, and bol... | cond-mat_mes-hall |
Active feedback of a Fabry-Perot cavity to the emission of a single
InAs/GaAs quantum dot: We present a detailed study of the use of Fabry-Perot (FP) cavities for the
spectroscopy of single InAs quantum dots (QDs). We derive optimal cavity
characteristics and resolution limits, and measure photoluminescence linewidth... | cond-mat_mes-hall |
Fermionic and bosonic ac conductivities at strong disorder: We study the ac conduction in a system of fermions or bosons strongly
localised in a disordered array of sites with short-range interactions at
frequencies larger than the intersite tunnelling but smaller than the
characteristic fluctuation of the on-site ener... | cond-mat_mes-hall |
Absence of nonlocal resistance in microstructures of PbTe quantum wells: We report on experiments allowing to set an upper limit on the magnitude of
the spin Hall effect and the conductance by edge channels in quantum wells of
PbTe embedded between PbEuTe barriers. We reexamine previous data obtained for
epitaxial micr... | cond-mat_mes-hall |
Extraction of many-body configurations from nonlinear absorption in
semiconductor quantum wells: Detailed electronic many-body configurations are extracted from
quantitatively measured timeresolved nonlinear absorption spectra of resonantly
excited GaAs quantum wells. The microscopic theory assigns the observed
spect... | cond-mat_mes-hall |
Long-time coherence in fourth-order spin correlation functions: We study the long-time decay of fourth-order electron spin correlation
functions for an isolated singly charged semi-conductor quantum dot. The
electron spin dynamics is governed by the applied external magnetic field as
well as the hyperfine interaction. ... | cond-mat_mes-hall |
Wide range electrical tunability of single photon emission from
chromium-based colour centres in diamond: We demonstrate electrical control of the single photon emission spectrum from
chromium-based colour centres implanted in monolithic diamond. Under an
external electric field the tunability range is typically thre... | cond-mat_mes-hall |
Electronic Transport and Thermopower in 2D and 3D Heterostructures--A
Theory Perspective: In this review, we discuss the impact of interfaces and heterojuctions on the
electronic and thermoelectric transport properties of materials. We review
recent progress in understanding electronic transport in two-dimensional (2... | cond-mat_mes-hall |
Stretching graphene using polymeric micro-muscles: The control of strain in two-dimensional materials opens exciting
perspectives for the engineering of their electronic properties. While this
expectation has been validated by artificial-lattice studies, it remains
elusive in the case of atomic lattices. Remarkable res... | cond-mat_mes-hall |
Electrical and thermal transport through $α-T_3$ NIS junction: We investigate the electrical and thermal transport properties of the
$\alpha-T_3$ based normal metal-insulator-superconductor (NIS) junction using
Blonder-Tinkham-Klapwijk (BTK) theory. We show that the tunneling conductance
of the NIS junction is an oscil... | cond-mat_mes-hall |
Ab initio theory of electron-phonon mediated ultrafast spin relaxation
of laser-excited hot electrons in transition-metal ferromagnets: We report a computational theoretical investigation of electron spin-flip
scattering induced by the electron-phonon interaction in the transition-metal
ferromagnets bcc Fe, fcc Co an... | cond-mat_mes-hall |
Thermoelectric and Seebeck coefficients of granular metals: In this work we present a detailed study and derivation of the thermopower
and thermoelectric coefficient of nano-granular metals at large tunneling
conductance between the grains, g_T>> 1. An important criterion for the
performance of a thermoelectric device ... | cond-mat_mes-hall |
Nanoelectromechanics of shuttle devices: A single-electron tunneling (SET) device with a nanoscale central island that
can move with respect to the bulk source- and drain electrodes allows for a
nanoelectromechanical (NEM) coupling between the electrical current through the
device and mechanical vibrations of the islan... | cond-mat_mes-hall |
Geometrical meaning of winding number and its characterization of
topological phases in one-dimensional chiral non-Hermitian systems: We unveil the geometrical meaning of winding number and utilize it to
characterize the topological phases in one-dimensional chiral non-Hermitian
systems. While chiral symmetry ensures... | cond-mat_mes-hall |
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