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Towards Substrate Engineering of Graphene-Silicon Schottky Diode
Photodetectors: Graphene-Silicon Schottky diode photodetectors possess beneficial properties
such as high responsivities and detectivities, broad spectral wavelength
operation and high operating speeds. Various routes and architectures have been
employe... | cond-mat_mes-hall |
Interference Effects on Kondo-Assisted Transport through Double Quantum
Dots: We systematically investigate electron transport through double quantum dots
with particular emphasis on interference induced via multiple paths of electron
propagation. By means of the slave-boson mean-field approximation, we calculate
the... | cond-mat_mes-hall |
Quantum transport through single and multilayer icosahedral fullerenes: We use a tight-binding Hamiltonian and Green functions methods to calculate
the quantum transmission through single-wall fullerenes and bilayered and
trilayered onions of icosahedral symmetry attached to metallic leads. The
electronic structure of ... | cond-mat_mes-hall |
Low conductance of the nickel atomic junctions in hydrogen atmosphere: The low conductance of nickel atomic junctions in the hydrogen environment is
studied using the nonequilibrium Green's function theory combined with
first-principles calculations. The Ni junction bridged by a $H_2$ molecule has
a conductance of appr... | cond-mat_mes-hall |
A scattering model of 1D quantum wire regular polygons: We calculate the quantum states of regular polygons made of 1D quantum wires
treating each polygon vertex as a scatterer. The vertex scattering matrix is
analytically obtained from the model of a circular bend of a given angle of a
2D nanowire. In the single mode ... | cond-mat_mes-hall |
Controlling transport properties of graphene nanoribbons by
codoping-induced edge distortions: One notable manifestation of the peculiar edge-localized states in zigzag
graphene nanoribbons (zGNRs) is the p-type (n-type) characteristics of nitrogen
(boron) edge-doped GNRs, and such behavior was so far considered to b... | cond-mat_mes-hall |
Current-induced mechanical torque in chiral molecular rotors: A great endeavor has been undertaken to engineer molecular rotors operated by
an electrical current. A frequently met operation principle is the transfer of
angular momentum taken from the incident flux. In this paper we present an
alternative driving agent ... | cond-mat_mes-hall |
Low-power photothermal self-oscillation of bimetallic nanowires: We investigate the nonlinear mechanics of a bimetallic, optically absorbing
SiN-Nb nanowire in the presence of incident laser light and a reflecting Si
mirror. Situated in a standing wave of optical intensity and subject to
photothermal forces, the nanowi... | cond-mat_mes-hall |
Non-Hermitian Boundary Modes: We consider conditions for the existence of boundary modes in non-Hermitian
systems with edges of arbitrary co-dimension. Through a universal formulation
of formation criteria for boundary modes in terms of local Green functions, we
outline a generic perspective on the appearance of such m... | cond-mat_mes-hall |
Fast and anomalous exciton diffusion in two-dimensional hybrid
perovskites: Two-dimensional hybrid perovskites are currently in the spotlight of
condensed matter and nanotechnology research due to their intriguing
optoelectronic and vibrational properties with emerging potential for
light-harvesting and -emitting app... | cond-mat_mes-hall |
Delocalisation of Majorana quasiparticles in plaquette--nanowire hybrid
system: Interplay between superconductivity, spin-orbit coupling and magnetic field
can lead to realisation of the topologically non--trivial states which in
finite one dimensional nanowires are manifested by emergence of a pair of
zero-energy Ma... | cond-mat_mes-hall |
Waiting time distributions in Quantum spin hall based heterostructures: For the distinction of the Andreev bound states and Majorana bound states, we
study the waiting time distributions (WTDs) for heterostructures, based on one
dimensional edge states of a two dimensional topological insulators (TI) in
combination wit... | cond-mat_mes-hall |
High-speed metamagnetic resistive switching of FeRh through Joule
heating: Due to its proximity to room temperature and demonstrated high degree of
temperature tunability, the metamagnetic ordering transition in FeRh is
attractive for novel high-performance computing devices seeking to use
magnetism as the state vari... | cond-mat_mes-hall |
Contact-induced negative differential resistance in short-channel
graphene FETs: In this work, we clarify the physical mechanism for the phenomenon of
negative output differential resistance (NDR) in short-channel graphene FETs
(GFETs) through non-equilibrium Green's function (NEGF) simulations and a
simpler semianal... | cond-mat_mes-hall |
Control of a spin qubit in a lateral GaAs quantum dot based on symmetry
of gating potential: We study the influence of quantum dot symmetry on the Rabi frequency and
phonon induced spin relaxation rate in a single electron GaAs spin qubit. We
find that anisotropic dependence on the magnetic field direction is indepen... | cond-mat_mes-hall |
Coherent radiation by magnets with exchange interactions: A wide class of materials acquires magnetic properties due to particle
interactions through exchange forces. These can be atoms and molecules
composing the system itself, as in the case of numerous magnetic substances. Or
these could be different defects, as in ... | cond-mat_mes-hall |
Second-order polaron resonances in self assembled quantum dots: We theoretically study the optical properties of an InAs/GaAs quantum dot
(QD) near the area of the second-order resonance between an electron confined
in the QD and two longitudinal optical phonons. We present the absorption
spectra of an inhomogeneously ... | cond-mat_mes-hall |
Polarization Of Quantum Hall States, Skyrmions and Berry Phase: We have discussed here the polarization of quantum Hall states in the
framework of the hierarchical analysis of IQHE and FQHE in terms of Berry
phase. It is observed that we have fully polarized states for the filling
factor $\nu=1$ as well as $\nu=\frac{1... | cond-mat_mes-hall |
Magnetization dynamics and spin pumping induced by standing elastic
waves: The magnetization dynamics induced by standing elastic waves excited in a
thin ferromagnetic film is described with the aid of micromagnetic simulations
taking into account the magnetoelastic coupling between spins and lattice
strains. The sim... | cond-mat_mes-hall |
Magnetic anisotropy in surface-supported single-ion lanthanide complexes: Single-ion lanthanide-organic complexes can provide stable magnetic moments
with well-defined orientation for spintronic applications on the atomic level.
Here, we show by a combined experimental approach of scanning tunneling
microscopy and X-ra... | cond-mat_mes-hall |
Light-Driven Nanoscale Vectorial Currents: Controlled charge flows are fundamental to many areas of science and
technology, serving as carriers of energy and information, as probes of
material properties and dynamics, and as a means of revealing or even inducing
broken symmetries. Emerging methods for light-based curre... | cond-mat_mes-hall |
Surface Percolation and Growth. An alternative scheme for breaking the
diffraction limit in optical patterning: A nanopatterning scheme is presented by which the structure height can be
controlled in the tens of nanometers range and the lateral resolution is a
factor at least three times better than the point spread ... | cond-mat_mes-hall |
Electron-Hole Liquid in Monolayer Transition Metal Dichalcogenide
Heterostructures: Monolayer films of transition metal dichalcogenides (in particular, MoS2,
MoSe2, WS2, and WSe2) can be considered as ideal systems for the studies of
high-temperature electron-hole liquids. The quasi-two-dimensional nature of
electron... | cond-mat_mes-hall |
The specific heat and the radial thermal expansion of bundles of
single-walled carbon nanotubes: The specific heat at constant pressure of bundles of single-walled carbon
nanotubes closed at their ends has been investigated in a temperature interval
of 2-120 K. It is found that the curve of heat capacity has features... | cond-mat_mes-hall |
Optical orientation of excitons in a longitudinal magnetic field in
indirect band gap (In,Al)As/AlAs quantum dots with type-I band alignment: The exciton recombination and spin dynamics in (In,Al)As/AlAs quantum dots
(QDs) with indirect band gap and type-I band alignment are studied. The
negligible (less than $0.2~\m... | cond-mat_mes-hall |
Spectral and transport properties of the two-dimensional Lieb lattice: The specific topology of the line centered square lattice (known also as the
Lieb lattice) induces remarkable spectral properties as the macroscopically
degenerated zero energy flat band, the Dirac cone in the low energy spectrum,
and the peculiar H... | cond-mat_mes-hall |
Microwave amplification with nanomechanical resonators: Sensitive measurement of electrical signals is at the heart of modern science
and technology. According to quantum mechanics, any detector or amplifier is
required to add a certain amount of noise to the signal, equaling at best the
energy of quantum fluctuations.... | cond-mat_mes-hall |
Second-Harmonic Generation in Nano-Structured Metamaterials: We conduct a theoretical and numerical study on the second-harmonic (SH)
optical response of a nano-structured metamaterial composed of a periodic array
of inclusions. Both the inclusions and their surrounding matrix are made of
centrosymmetrical materials, f... | cond-mat_mes-hall |
Terahertz-induced resistance oscillations in high mobility
two-dimensional electron systems: We report on a theoretical work on magnetotransport under terahertz radiation
with high mobility two-dimensional electron systems. We focus on the
interaction between the obtained radiation-induced magnetoresistance
oscillati... | cond-mat_mes-hall |
Are Microwave Induced Zero Resistance States Necessarily Static?: We study the effect of inhomogeneities in Hall conductivity on the nature of
the Zero Resistance States seen in the microwave irradiated two-dimensional
electron systems in weak perpendicular magnetic fields, and we show that
time-dependent domain patter... | cond-mat_mes-hall |
Exchange interaction effects in the thermodynamic properties of quantum
dots: We study electron-electron interaction effects in the thermodynamic
properties of quantum-dot systems. We obtain the direct and exchange
contributions to the specific heat C_v in the self-consistent Hartree-Fock
approximation at finite temp... | cond-mat_mes-hall |
Scattering by linear defects in graphene: a tight-binding approach: We develop an analytical scattering formalism for computing the transmittance
through periodic defect lines within the tight-binding model of graphene. We
first illustrate the method with a relatively simple case, the pentagon-only
defect line. Afterwa... | cond-mat_mes-hall |
Screening of a Luttinger liquid wire by a scanning tunneling microscope
tip: II. Transport properties: We study the effect of an electrostatic coupling between a scanning tunneling
microscope tip and a Luttinger liquid wire on the tunneling current and noise
between the two. Solving the Dyson equations non perturbati... | cond-mat_mes-hall |
Oxygen vacancies dynamics in redox-based interfaces: Tailoring the
memristive response: Redox-based memristive devices are among the alternatives for the next
generation of non volatile memories, but also candidates to emulate the
behavior of synapses in neuromorphic computing devices. It is nowadays well
established... | cond-mat_mes-hall |
Ramsey Interference in a Multi-level Quantum System: We report Ramsey interference in the excitonic population of a negatively
charged quantum dot revealing the coherence of the state in the limit where
radiative decay is dominant. Our experiments show that the decay time of the
Ramsey interference is limited by the sp... | cond-mat_mes-hall |
Quantum information processing with large nuclear spins in GaAs
semiconductors: We propose an implementation for quantum information processing based on
coherent manipulations of nuclear spins I=3/2 in GaAs semiconductors. We
describe theoretically an NMR method which involves multiphoton transitions and
which exploi... | cond-mat_mes-hall |
Effect of the electromagnetic environment on current fluctuations in
driven tunnel junctions: We examine current fluctuations in tunnel junctions driven by a superposition
of a constant and a sinusoidal voltage source. In standard setups the external
voltage is applied to the tunneling element via an impedance provid... | cond-mat_mes-hall |
Electronics and photonics: two sciences in the benefit of solar energy
conversion: This paper gives a personal global point of view on two sciences: electronics
and photonics towards plasmonics and solar energy conversion. The new research
directions in these two sciences are pointed out by comparison and in the
pers... | cond-mat_mes-hall |
Neck Barrier Engineering in Quantum Dot Dimer Molecules via
Intra-Particle Ripening: Coupled colloidal quantum dot (CQD) dimers represent a new class of
artificial molecules composed of fused core/shell semiconductor nanocrystals.
The electronic coupling and wavefunction hybridization is enabled by the
formation of a... | cond-mat_mes-hall |
Van Hove scenario of anisotropic transport in a two-dimensional
spin-orbit coupled electron gas in an in-plane magnetic field: We study electronic transport in two-dimensional spin-orbit coupled electron
gas subjected to an in-plane magnetic field. The interplay of the spin-orbit
interaction and the magnetic field le... | cond-mat_mes-hall |
Quantum theory of an electron waiting time clock: The electron waiting time is the time that passes between two subsequent
charge transfers in an electronic conductor. Recently, theories of electron
waiting times have been devised for quantum transport in Coulomb-blockade
structures and for mesoscopic conductors, howev... | cond-mat_mes-hall |
Effect of charged line defects on conductivity in graphene: numerical
Kubo and analytical Boltzmann approaches: Charge carrier transport in single-layer graphene with one-dimensional
charged defects is studied theoretically. Extended charged defects, considered
an important factor for mobility degradation in chemical... | cond-mat_mes-hall |
Unexpected Behavior of the Local Compressibility Near the B=0
Metal-Insulator Transition: We have measured the local electronic compressibility of a two-dimensional
hole gas as it crosses the B=0 Metal-Insulator Transition. In the metallic
phase, the compressibility follows the mean-field Hartree-Fock (HF) theory and... | cond-mat_mes-hall |
Evolution of the Spin Hall Magnetoresistance in Cr$_2$O$_3$/Pt bilayers
close to the Néel temperature: We study the evolution of magnetoresistance with temperature in thin film
bilayers consisting of platinum and the antiferromagnet Cr$_2$O$_3$ with its
easy axis out of the plane. We vary the temperature from 20 - 60... | cond-mat_mes-hall |
Localized States and Quantum Spin Hall Effect in Si-Doped InAs/GaSb
Quantum Wells: We study localized in-gap states and quantum spin Hall effect in Si-doped
InAs/GaSb quantum wells. We propose a model describing donor and/or acceptor
impurities to describe Si dopants. This model shows in-gap bound states and
wide con... | cond-mat_mes-hall |
Escape from a zero current state in a one dimensional array of Josephson
junctions: A long one dimensional array of small Josephson junctions exhibits Coulomb
blockade of Cooper pair tunneling. This zero current state exists up to a
switching voltage, Vsw, where there is a sudden onset of current. In this paper
we pr... | cond-mat_mes-hall |
Topological classification of the single-wall carbon nanotube: The single-wall carbon nanotube (SWNT) can be a one-dimensional topological
insulator, which is characterized by a $\mathbb{Z}$-topological invariant,
winding number. Using the analytical expression for the winding number, we
classify the topology for all p... | cond-mat_mes-hall |
Tuning the magnetic configuration of bilayer graphene quantum dot by
twisting: Twistronic has recently attracted tremendous attention because the twisting
can engineer the bilayer graphene-like materials into varying types of strongly
correlated phases. In this paper, we study the twisting of bilayer graphene
(BLG) q... | cond-mat_mes-hall |
Photoluminescence in PbS nanocrystal thin films: Nanocrystal density,
film morphology and energy transfer: We show that photoluminescence properties of PbS nanocrystal thin films are
directly related to film morphology and nanocrystal density. In densely packed
PbS nanocrystal films, low-temperature donor-to-acceptor... | cond-mat_mes-hall |
Gate-Controlled Magnetoresistance of a Paramagnetic Insulator|Platinum
Interface: We report an electric field-induced in-plane magnetoresistance of an
atomically flat paramagnetic insulator|platinum (Pt) interface at low
temperatures with an ionic liquid gate. Transport experiments as a function of
applied magnetic f... | cond-mat_mes-hall |
Deterministic Weak Localization in Periodic Structures: The weak localization is found for perfect periodic structures exhibiting
deterministic classical diffusion. In particular, the velocity autocorrelation
function develops a universal quantum power law decay at 4 times Ehrenfest
time, following the classical stretc... | cond-mat_mes-hall |
Electrical transport in deformed nanostrips: electrical signature of
reversible mechanical failure: We calculate the electrical conductivity of a thin crystalline strip of atoms
confined within a quasi one dimensional channel of fixed width. The
conductivity shows anomalous behavior as the strip is deformed under ten... | cond-mat_mes-hall |
Spatially dispersive dynamical response of hot carriers in doped
graphene: We study theoretically wave-vector and frequency dispersion of the complex
dynamic conductivity tensor (DCT), $\sigma_{lm}(\mathbf{k}, \omega)$, of doped
monolayer graphene under a strong dc electric field. For a general analysis, we
consider ... | cond-mat_mes-hall |
Material Parameters for Faster Ballistic Switching of an In-plane
Magnetized Nanomagnet: High-speed magnetization switching of a nanomagnet is necessary for faster
information processing. The ballistic switching by a pulsed magnetic filed is a
promising candidate for the high-speed switching. It is known that the
swi... | cond-mat_mes-hall |
Temperature-linear Resistivity in Twisted Double Bilayer Graphene: We report an experimental study of carrier density (n), displacement field
(D) and twist angle ({\theta}) dependence of temperature (T)-linear resistivity
in twisted double bilayer graphene (TDBG). For a large twist angle
({\theta}>1.5{\deg}) where corr... | cond-mat_mes-hall |
Electric field effects on the band gap and edge states of monolayer
1T'-WTe2: Monolayer 1T'-WTe2 is a quantum spin Hall insulator with a gapped bulk and
gapless helical edge states persisting to temperatures around 100 K. Recent
studies have revealed a topological-to-trivial phase transition as well the
emergence of ... | cond-mat_mes-hall |
Valley filters using graphene blister defects from first principles: Valleytronics, which makes use of the two valleys in graphenes, attracts
considerable attention and a valley filter is expected to be the central
component in valleytronics. We propose the application of the graphene valley
filter using blister defect... | cond-mat_mes-hall |
Mesoscopic to universal crossover of transmission phase of multi-level
quantum dots: Transmission phase \alpha measurements of many-electron quantum dots (small
mean level spacing \delta) revealed universal phase lapses by \pi between
consecutive resonances. In contrast, for dots with only a few electrons (large
\del... | cond-mat_mes-hall |
Magnetic field induces giant nonlinear optical response in Weyl
semimetals: We study the second-order optical response of Weyl semimetals in the presence
of a magnetic field. We consider an idealized model of a perfectly linear Weyl
node and use the Kubo formula at zero temperature to calculate the intrinsic
contribu... | cond-mat_mes-hall |
Low-field magnetotransport in graphene cavity devices: Confinement and edge structures are known to play significant roles in
electronic and transport properties of two-dimensional materials. Here, we
report on low-temperature magnetotransport measurements of lithographically
patterned graphene cavity nanodevices. It i... | cond-mat_mes-hall |
Skyrmion Brownian circuit implemented in a continuous ferromagnetic thin
film: The fabrication of a skyrmion circuit which stabilizes skyrmions is important
to realize micro- to nano-sized skyrmion devices. One example of promising
skyrmion-based device is Brownian computers, which have been theoretically
proposed, b... | cond-mat_mes-hall |
Thickness and electric field dependent polarizability and dielectric
constant in phosphorene: Based on extensive first principle calculations, we explore the thickness
dependent effective di- electric constant and slab polarizability of few layer
black phosphorene. We find that the dielectric constant in ultra-thin
p... | cond-mat_mes-hall |
Tunable spin and transport in porphyrin-graphene nanoribbon hybrids: Recently, porphyrin units have been attached to graphene nanoribbons
(Por-GNR) enabling a multitude of possible structures. Here we report first
principles calculations of two prototypical, experimentally feasible, Por-GNR
hybrids, one of which displa... | cond-mat_mes-hall |
Control of charging in resonant tunneling through InAs nanocrystal
quantum dots: Tunneling spectroscopy of InAs nanocrystals deposited on graphite was
measured using scanning tunneling microscopy, in a double-barrier
tunnel-junction configuration. The effect of the junction symmetry on the
tunneling spectra is studie... | cond-mat_mes-hall |
Quantum transport in flat bands and super-metallicity: Quantum physics in flat-band (FB) systems embodies a variety of exotic
phenomenon and even counter intuitive features. The quantum transport in
several graphene based compounds that exhibit a flat band and a tunable gap is
investigated. Despite the localized nature... | cond-mat_mes-hall |
Cotunneling effects in GaAs vertical double quantum dot: We observed lifting of Coulomb blockade in GaAs vertical double quantum dot
with low potential barriers, induced by cotunneling mechanisms at dilution
fridge temperature of 10 mK. Several distinct features were observed, compared
to single dot case, and appropria... | cond-mat_mes-hall |
Spin dynamics and spin-dependent recombination of a polaron pair under a
strong ac drive: We study theoretically the recombination within a pair of two polarons in
magnetic field subject to a strong linearly polarized ac drive. Strong drive
implies that the Zeeman frequencies of the pair-partners are much smaller tha... | cond-mat_mes-hall |
Fast and slow edges in bilayer graphene nanoribbons: Tuning the
transition from band- to Mott-insulator: We show that gated bilayer graphene zigzag ribbons possess a fast and a slow
edge, characterized by edge state velocities that differ due to non-negligible
next-nearest-neighbor hopping elements. By applying boson... | cond-mat_mes-hall |
Designer quantum states of matter created atom-by-atom: With the advances in high resolution and spin-resolved scanning tunneling
microscopy as well as atomic-scale manipulation, it has become possible to
create and characterize quantum states of matter bottom-up, atom-by-atom. This
is largely based on controlling the ... | cond-mat_mes-hall |
Reaction diffusion dynamics and the Schryer-Walker solution for domain
walls of the Landau-Lifshitz-Gilbert equation: We study the dynamics of the equation obtained by Schryer and Walker for the
motion of domain walls. The reduced equation is a reaction diffusion equation
for the angle between the applied field and t... | cond-mat_mes-hall |
Formation of image-potential states at the graphene/metal interface: The formation of image-potential states at the interface between a graphene
layer and a metal surface is studied by means of model calculations. An
analytical one-dimensional model-potential for the combined system is
constructed and used to calculate... | cond-mat_mes-hall |
Full counting statistics of information content and particle number: We consider a bipartite quantum conductor and discuss the joint probability
distribution of particle number in a subsystem and the self-information
associated with the reduced density matrix of the subsystem. By extending the
multi-contour Keldysh Gre... | cond-mat_mes-hall |
Ultrafast excitation and topological soliton formation in incommensurate
charge density wave states: Topological soliton is a nonperturbative excitation in commensurate density
wave states and connects degenerate ground states. In incommensurate density
wave states, ground states are continuously degenerate and topol... | cond-mat_mes-hall |
Controlling the conductance of molecular wires by defect engineering: a
divide et impera approach: Understanding of charge transport mechanisms in nanoscale structures is
essential for the development of molecular electronic devices. Charge transport
through 1D molecular systems connected between two contacts is infl... | cond-mat_mes-hall |
Thermodynamic Properties of Graphene in Magnetic Field and Rashba
Coupling: We study the thermodynamic properties of massless Dirac fermions in graphene
subjected to a uniform magnetic field $B$ together with Rashba coupling
parameter $\lambda_R$. The thermodynamic functions such as the Helmholtz free
energy, total e... | cond-mat_mes-hall |
Driven Andreev molecule: We study the three terminal S-QD-S-QD-S Josephson junction biased with
commensurate voltages. In the absence of an applied voltage, the Andreev bound
states on each quantum dot hybridize forming an `Andreev molecule'. However,
understanding of this system in a non-equilibrium setup is lacking. ... | cond-mat_mes-hall |
Bloch-point-mediated topological transformations of magnetic domain
walls in cylindrical nanowires: Cylindrical nanowires made of soft magnetic materials, in contrast to thin
strips, may host domain walls of two distinct topologies. Unexpectedly, we
evidence experimentally the dynamic transformation of topology upon ... | cond-mat_mes-hall |
Excited-state spectroscopy on a quantum dot side-coupled to a quantum
wire: We report excited-state spectroscopy on a quantum dot side-coupled to a
quantum wire with accurate energy estimation. Our method utilizes periodic
voltage pulses on the dot, and the energy calibration is performed with
reference to the bias v... | cond-mat_mes-hall |
Fragility of spectral flow for topological phases in non-Wigner-Dyson
classes: Topological insulators and superconductors support extended surface states
protected against the otherwise localizing effects of static disorder.
Specifically, in the Wigner-Dyson insulators belonging to the symmetry classes
A, AI, and AII... | cond-mat_mes-hall |
Spin-orbit coupled transport and spin torque in a ferromagnetic
heterostructure: Ferromagnetic heterostructures provide an ideal platform to explore the
nature of spin-orbit torques arising from the interplay mediated by itinerant
electrons between a Rashba-type spin-orbit coupling and a ferromagnetic
exchange intera... | cond-mat_mes-hall |
Cotunneling thermopower of single electron transistors: We study the thermopower of a quantum dot weakly coupled to two reservoirs by
tunnel junctions. At low temperatures the transport through the dot is
suppressed by charging effects (Coulomb blockade). As a result the thermopower
shows an oscillatory dependence on t... | cond-mat_mes-hall |
Atomically thin quantum light emitting diodes: Transition metal dichalcogenides (TMDs) are optically active layered
materials providing potential for fast optoelectronics and on-chip photonics.
We demonstrate electrically driven single-photon emission from localised sites
in tungsten diselenide (WSe2) and tungsten disu... | cond-mat_mes-hall |
The Parallel Magnetoconductance of Interacting Electrons in a Two
Dimensional Disordered System: The transport properties of interacting electrons for which the spin degree
of freedom is taken into account are numerically studied for small two
dimensional diffusive clusters. On-site electron-electron interactions ten... | cond-mat_mes-hall |
Strong gate-tunability of flat bands in bilayer graphene due to moiré
encapsulation between hBN monolayers: When using hexagonal boron-nitride (hBN) as a substrate for graphene, the
resulting moir\'e pattern creates secondary Dirac points. By encapsulating a
multilayer graphene within aligned hBN sheets the controlle... | cond-mat_mes-hall |
The Edge-State Theory of Integer-Quantum-Hall-Effect to Insulator
Transition: Direct transitions, driven by disorder, from several integral quantum Hall
states to an insulator have been observed in experiment. This finding is
enigmatic in light of a theoretical phase diagram, based on rather general
considerations, t... | cond-mat_mes-hall |
Quantum Fluctuations along Symmetry Crossover in Kondo-correlated
Quantum Dot: Universal properties of entangled many-body states are controlled by their
symmetry and quantum fluctuations. By magnetic-field tuning of the spin-orbital
degeneracy in a Kondo-correlated quantum dot, we have modified quantum
fluctuations ... | cond-mat_mes-hall |
Bundling dynamics regulates the active mechanics and transport in carbon
nanotube networks: High-density carbon nanotube networks (CNNs) continue to attract interest as
active elements in nanoelectronic devices, nanoelectromechanical systems (NEMS)
and multifunctional nanocomposites. The interplay between the network... | cond-mat_mes-hall |
Theoretical Investigation of Local Electron Temperature in Quantum Hall
Systems: In this work we solve thermo-hydrodynamical equations considering a two
dimensional electron system in the integer quantum Hall regime, to calculate
the spatial distribution of the local electron temperature. We start from the
self-consi... | cond-mat_mes-hall |
Time scales for Majorana manipulation using Coulomb blockade in
gate-controlled superconducting nanowires: We numerically compute the low-energy spectrum of a gate-controlled
superconducting topological nanowire segmented into two islands, each
Josephson-coupled to a bulk superconductor. This device may host two pair... | cond-mat_mes-hall |
Cooling of suspended nanostructures with tunnel junctions: We have investigated electronic cooling of suspended nanowires with SINIS
tunnel junction coolers. The suspended samples consist of a free standing
nanowire suspended by four narrow ($\sim$ 200 nm) bridges. We have compared two
different cooler designs for cool... | cond-mat_mes-hall |
Anomalous levitation and annihilation in Floquet topological insulators: Anderson localization in two-dimensional topological insulators takes place
via the so-called levitation and pair annihilation process. As disorder is
increased, extended bulk states carrying opposite topological invariants move
towards each other... | cond-mat_mes-hall |
Spin Polarization and Transport of Surface States in the Topological
Insulators Bi2Se3 and Bi2Te3 from First Principles: We investigate the band dispersion and the spin texture of topologically
protected surface states in the bulk topological insulators Bi2Se3 and Bi2Te3
by first-principles methods. Strong spin-orbit... | cond-mat_mes-hall |
Few-layer graphene patterned bottom gates for van der Waals
heterostructures: We introduce a method of local gating for van der Waals heterostructures,
employing a few-layer graphene patterned bottom gate. Being a member of the 2D
material family, few-layer graphene adapts perfectly to the commonly used
stacking meth... | cond-mat_mes-hall |
Interplay of quantum spin Hall effect and spontaneous time-reversal
symmetry breaking in electron-hole bilayers I: Transport properties: The band-inverted electron-hole bilayers, such as InAs/GaSb, are an
interesting playground for the interplay of quantum spin Hall effect and
correlation effects because of the small... | cond-mat_mes-hall |
Deviation from the normal mode expansion in a coupled
graphene-nanomechanical system: We optomechanically measure the vibrations of a nanomechanical system made of
a graphene membrane suspended on a silicon nitride nanoresonator. When probing
the thermal noise of the coupled nanomechanical device, we observe a
signif... | cond-mat_mes-hall |
Transport properties of overheated electrons trapped on a Helium surface: An ultra-strong photovoltaic effect has recently been reported for electrons
trapped on a liquid Helium surface under a microwave excitation tuned at
intersubband resonance [D. Konstantinov et. al. : J. Phys. Soc. Jpn. 81, 093601
(2012) ]. In thi... | cond-mat_mes-hall |
Dirac fermion quantization on graphene edges: Isospin-orbit coupling,
zero modes and spontaneous valley polarization: The paper addresses boundary electronic properties of graphene with a complex
edge structure of the armchair/zigzag/armchair type. It is shown that the
finite zigzag region supports edge bound states ... | cond-mat_mes-hall |
Strongly bound excitons in monolayer MoSi$_2$Z$_4$ (Z = pnictogen): Reduced dielectric screening in two-dimensional materials enables bound
excitons, which modifies their optical absorption and optoelectronic response
even at room temperature. Here, we demonstrate the existence of excitons in the
bandgap of the monolay... | cond-mat_mes-hall |
Zero-field magnetometry using hyperfine-biased nitrogen-vacancy centers
near diamond surfaces: Shallow nitrogen-vacancy (NV) centers in diamond are promising for
nano-magnetometry for they can be placed proximate to targets. To study the
intrinsic magnetic properties, zero-field magnetometry is desirable. However,
fo... | cond-mat_mes-hall |
Nonlinear dynamics of a functionally graded piezoelectric
micro-resonator in the vicinity of the primary resonance: This research is on the nonlinear dynamics of a two-sided electrostatically
actuated capacitive micro-beam. The microresonator is composed of silicon and
PZT as a piezoelectric material. PZT is function... | cond-mat_mes-hall |
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