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Multiple Andreev reflections in a quantum dot coupled to
superconductors: Effects of spin-orbit coupling: We study the out-of-equilibrium current through a multilevel quantum dot
contacted to two superconducting leads and in the presence of Rashba and
Dresselhaus spin-orbit couplings, in the regime of strong dot-lead... | cond-mat_mes-hall |
Emergence of a negative charging energy in a metallic dot capacitively
coupled to a superconducting island: We consider the hybrid setup formed by a metallic dot, capacitively coupled
to a superconducting island S connected to a bulk superconductor by a Josephson
junction. Charge fluctuations in S act as a dynamical ... | cond-mat_mes-hall |
Spectral signatures of high-symmetry quantum dots and effects of
symmetry breaking: A sequence of photoluminescence spectroscopy based methods are used to
rigorously identify and study all the main spectral features (more than thirty
emission lines) of site controlled InGaAs/AlGaAs quantum dots (QDs) grown along
[111... | cond-mat_mes-hall |
Floquet metal to insulator phase transitions in semiconductor nanowires: We study steady-states of semiconductor nanowires subjected to strong
resonant time-periodic drives. The steady-states arise from the balance between
electron-phonon scattering, electron-hole recombination via photo-emission, and
Auger scattering ... | cond-mat_mes-hall |
Interaction of a graphene sheet with a ferromagnetic metal plate: Nanoscale surface forces such as Casimir and the van der Waals forces can
have a significant influence on fabrication, handling and assembly processes as
well as the performance of micro and nano devices. In this paper, the
investigation and the calculat... | cond-mat_mes-hall |
Bright-exciton fine structures splittings in single perovskite
nanocrystals: Although both epitaxial quantum dots (QDs) and colloidal nanocrystals (NCs)
are quantum-confined semiconductor nanostructures, so far they have
demonstrated dramatically-different exciton fine structure splittings (FSSs) at
the cryogenic tem... | cond-mat_mes-hall |
Determination of the thickness and orientation of few-layer tungsten
ditelluride using polarized Raman spectroscopy: Orthorhombic tungsten ditelluride (WTe2), with a distorted 1T structure,
exhibits a large magnetoresistance that depends on the orientation, and its
electrical characteristics changes rom semimetallic ... | cond-mat_mes-hall |
Controlled strong coupling and absence of dark polaritons in
microcavities with double quantum wells: We demonstrate an efficient switching between strong and weak exciton-photon
coupling regimes in microcavity-embedded asymmetric double quantum wells,
controlled by an applied electric field. We show that a fine tuni... | cond-mat_mes-hall |
Quantum Transport in Spin-1 Chiral Fermion: Self-Consistent Born
Approximation: Quantum transport for a spin-1 chiral fermion is studied within the
self-consistent Born approximation. We find characteristic properties around
zero energy, i.e., the peak structure of the density of states and significant
suppression of... | cond-mat_mes-hall |
Velocity shift of surface acoustic waves due to interaction with
composite fermions in a modulated structure: We study the effect of a periodic density modulation on surface acoustic wave
(SAW) propagation along a 2D electron gas near Landau level filling $\nu=1/2$.
Within the composite fermion theory, the problem is... | cond-mat_mes-hall |
Tunnel Barrier to Spin Filter: Electronic Transport Characteristics of
Transition Metal Atom Encapsulated in Smallest Cadmium Telluride Cage: We report first principles theory-based comparative electronic transport
studies performed for an atomic chain of Au, bare Cd9Te9 cage-like cluster and
single transition metal ... | cond-mat_mes-hall |
Antiunitary symmetry protected higher order topological phases: Higher-order topological (HOT) phases feature boundary (such as corner and
hinge) modes of codimension $d_c>1$. We here identify an \emph{antiunitary}
operator that ensures the spectral symmetry of a two-dimensional HOT insulator
and the existence of corne... | cond-mat_mes-hall |
Electron spin tomography through counting statistics: a quantum
trajectory approach: We investigate the dynamics of electron spin qubits in quantum dots.
Measurement of the qubit state is realized by a charge current through the dot.
The dynamics is described in the framework of the quantum trajectory approach,
widel... | cond-mat_mes-hall |
High Frequency Response of Volatile Memristors: In this theoretical study, we focus on the high-frequency response of the
electrothermal NbO2-Mott threshold switch, a real-world electronic device,
which has been proved to be relevant in several applications and is classified
as a volatile memristor. Memristors of this ... | cond-mat_mes-hall |
Double quantum dot as a probe of nonequilibrium charge fluctuations at
the quantum point contact: Absorption of energy quanta generated by quantum point contact results in the
inelastic current through the double quantum dot placed nearby. In contrast to
a single quantum dot, the inelastic current through the double ... | cond-mat_mes-hall |
Phonon-dressed Mollow triplet in the regime of cavity-QED: We study the resonance fluorescence spectra of a driven quantum dot placed
inside a high $Q$ semiconductor cavity and interacting with an acoustic phonon
bath. The dynamics is calculated using a time-convolutionless master equation
obtained in the polaron frame... | cond-mat_mes-hall |
Effect of van-Hove singularities in single-walled carbon nanotube leads
on transport through double quantum dot system: The double quantum dot system with single-walled metallic armchair carbon
nanotube leads has been studied using Non-equilibrium Green function in the
Keldysh formalism. The effect of relative spacin... | cond-mat_mes-hall |
Models of Electrodes and Contacts in Molecular Electronics: Bridging the difference in atomic structure between experiments and
theoretical calculations and exploring quantum confinement effects in thin
electrodes (leads) are both important issues in molecular electronics. To
address these issues, we report here, by us... | cond-mat_mes-hall |
Efficient electrical spin readout of NV- centers in diamond: Using pulsed photoionization the coherent spin manipulation and echo
formation of ensembles of NV- centers in diamond are detected electrically
realizing contrasts of up to 17 %. The underlying spin-dependent ionization
dynamics are investigated experimentall... | cond-mat_mes-hall |
Large Landau level splitting with tunable one-dimensional graphene
superlattice probed by magneto capacitance measurements: The unique zero energy Landau Level of graphene has a particle-hole symmetry
in the bulk, which is lifted at the boundary leading to a splitting into two
chiral edge modes. It has long been theo... | cond-mat_mes-hall |
Comment on "Do Intradot Electron-Electron Interactions Induce
Dephasing?": In a recent Letter, Jiang, Sun, Xie and Wang [Phys. Rev. Lett. 93, 076802
(2004), cond-mat/0408261] study transport through an interacting quantum dot
embedded in one arm of an Aharonov-Bohm interferometer. Based on a theoretical
analysis of t... | cond-mat_mes-hall |
Spin noise of localized electrons interacting with optically cooled
nuclei: A microscopic theory of spin fluctuations of localized electrons interacting
with optically cooled nuclear spin bath has been developed. Since nuclear spin
temperature may stay low enough for macroscopically long time, the nuclear spin
system... | cond-mat_mes-hall |
Strain engineering of the electronic states of silicon-based quantum
emitters: Light-emitting complex defects in silicon have been considered a potential
platform for quantum technologies based on spin and photon degrees of freedom
working at telecom wavelengths. Their integration in complex devices is still
in its i... | cond-mat_mes-hall |
Optical Phonons in Twisted Bilayer Graphene with Gate-Induced Asymmetric
Doping: Twisted bilayer graphene (tBLG) devices with ion gel gate dielectrics are
studied using Raman spectroscopy in the twist angle regime where a resonantly
enhanced G band can be observed. We observe prominent splitting and intensity
quenchi... | cond-mat_mes-hall |
Distribution of waiting times between electron cotunnelings: In the resonant tunneling regime sequential processes dominate single
electron transport through quantum dots or molecules that are weakly coupled to
macroscopic electrodes. In the Coulomb blockade regime, however, cotunneling
processes dominate. Cotunneling ... | cond-mat_mes-hall |
Bound states in the continuum in a two-channel Fano-Anderson model: In this article, we study the formation of the bound states in the continuum
(BICs) in a two-channel Fano-Anderson model. We employ the Green's function
formalism, together with the equation of motion method, to analyze the relevant
observables, such a... | cond-mat_mes-hall |
Magnetization reversal in Py/Gd heterostructures: Using a combination of magnetometry and magnetotransport techniques, we
studied temperature and magnetic field behavior of magnetization in Py/Gd
heterostructures. It was shown quantitatively that proximity with Py enhances
magnetic order of Gd. Micromagnetic simulation... | cond-mat_mes-hall |
Waveguide-integrated single-crystalline GaP resonators on diamond: Large-scale entanglement of nitrogen-vacancy (NV) centers in diamond will
require integration of NV centers with optical networks. Toward this goal, we
present the fabrication of single-crystalline gallium phosphide (GaP)
resonator-waveguide coupled str... | cond-mat_mes-hall |
Spectroscopy and level detuning of few-electron spin states in parallel
InAs quantum dots: We use tunneling spectroscopy to study the evolution of few-electron spin
states in parallel InAs nanowire double quantum dots (QDs) as a function of
level detuning and applied magnetic field. Compared to the much more studied
... | cond-mat_mes-hall |
Quantum superposition of a single microwave photon in two different
"colour" states: The ability to coherently couple arbitrary harmonic oscillators in a
fully-controlled way is an important tool to process quantum information.
Coupling between quantum harmonic oscillators has previously been demonstrated
in several ... | cond-mat_mes-hall |
Coherent Radiation by Quantum Dots and Magnetic Nanoclusters: The assemblies of either quantum dots or magnetic nanoclusters are studied.
It is shown that such assemblies can produce coherent radiation. A method is
developed for solving the systems of nonlinear equations describing the
dynamics of such assemblies. The ... | cond-mat_mes-hall |
Negative differential magneto-resistance in ferromagnetic wires with
domain walls: A domain wall in a ferromagnetic one-dimensional nanowire experiences current
induced motion due to its coupling with the conduction electrons. When the
current is not sufficient to drive the domain wall through the wire, or it is
conf... | cond-mat_mes-hall |
Mu-Metal Enhancement of Effects in Electromagnetic Fields Over Single
Emitters Near Topological Insulators: We focus on the transmission and reflection coefficients of light in systems
involving of topological insulators (TI). Due to the electro-magnetic coupling
in TIs, new mixing coefficients emerge leading to new ... | cond-mat_mes-hall |
Ultrafast switchable spin-orbit coupling for silicon spin qubits via
spin valves: Recent experimental breakthroughs, particularly for single-qubit and
two-qubit gates exceeding the error correction threshold, highlight silicon
spin qubits as leading candidates for fault-tolerant quantum computation. In
the existing a... | cond-mat_mes-hall |
A semiclassical treatment of spinor topological effects in driven,
inhomogeneous insulators under external electromagnetic fields: Introducing internal degrees of freedom in the description of topological
insulators has led to a myriad of theoretical and experimental advances. Of
particular interest are the effects o... | cond-mat_mes-hall |
Quantum oscillations in two coupled charge qubits: Despite an apparent progress in implementing individual solid-state qubits,
there have been no experimental reports so far on multi-bit gates required for
building a real quantum computer. Here we report a new circuit comprising two
coupled charge qubits. Using a pulse... | cond-mat_mes-hall |
Quantum Shuttle in Phase Space: We present a quantum theory of the shuttle instability in electronic
transport through a nanostructure with a mechanical degree of freedom. A phase
space formulation in terms of the Wigner function allows us to identify a
cross-over from the tunnelling to the shuttling regime, thus exten... | cond-mat_mes-hall |
Engineering single donor detectors in doped silicon: We demonstrate the possibility of engineering a single donor transistor
directly from a phosphorous doped quantum dot by making use of the intrinsic
glassy behaviour of the structure as well as the complex electron dynamics
during cooldown. Characterisation of the de... | cond-mat_mes-hall |
Dielectric screening in two-dimensional insulators: Implications for
excitonic and impurity states in graphane: For atomic thin layer insulating materials we provide an exact analytic form
of the two-dimensional screened potential. In contrast to three-dimensional
systems where the macroscopic screening can be descri... | cond-mat_mes-hall |
A topological look at the quantum spin Hall state: We propose a topological understanding of the quantum spin Hall state without
considering any symmetries, and it follows from the gauge invariance that
either the energy gap or the spin spectrum gap needs to close on the system
edges, the former scenario generally resu... | cond-mat_mes-hall |
Coulomb scattering cross-section in a 2D electron gas and production of
entangled electrons: We calculate the Coulomb scattering amplitude for two electrons injected with
opposite momenta in an interacting 2DEG. We include the effect of the Fermi
liquid background by solving the 2D Bethe-Salpeter equation for the
two... | cond-mat_mes-hall |
Strong Band Hybridization between Silicene and Ag(111)Substrate: By using first-principles calculations, we systematically investigated
several observed phases of silicene on Ag(111) substrates and their electronic
structures. We find that the original Dirac cone of silicene is about 1.5-1.7
eV deeply below the Fermi l... | cond-mat_mes-hall |
Fano-shaped impurity spectral density, electric-field-induced in-gap
state and local magnetic moment of an adatom on trilayer graphene: Recently, the existence of local magnetic moment in a hydrogen adatom on
graphene has been confirmed experimentally [Gonz\'{a}lez-Herrero et al.,
Science, 2016, 352, 437]. Inspired b... | cond-mat_mes-hall |
Transfer matrix solution of the Wako-Saitô-Muñoz-Eaton model
augmented by arbitrary short range interactions: The Wako-Sait{\^o}-Mu\~noz-Eaton (WSME) model, initially introduced in the
theory of protein folding, has also been used in modeling the RNA folding and
some epitaxial phenomena. The advantage of this model i... | cond-mat_mes-hall |
A spin dephasing mechanism mediated by the interplay between the
spin-orbit coupling and the asymmetrical confining potential in semiconductor
quantum dot: Understanding the spin dephasing mechanism is of fundamental importance in
all potential applications of the spin qubit. Here we demonstrate a spin
dephasing me... | cond-mat_mes-hall |
Origin of thermoelectric response fluctuations in single-molecule
junctions: The thermoelectric response of molecular junctions exhibits large
fluctuations, as observed in recent experiments [e.g. Malen J. A. {\sl et al.},
Nano Lett. {\bf 10}, 3406 (2009)]. These were attributed to fluctuations in the
energy alignmen... | cond-mat_mes-hall |
Anomalous Dynamical Behavior of Freestanding Graphene Membranes: We report subnanometer, high-bandwidth measurements of the out-of-plane
(vertical) motion of atoms in freestanding graphene using scanning tunneling
microscopy. By tracking the vertical position over a long time period, a
1000-fold increase in the ability... | cond-mat_mes-hall |
Hamiltonian Description of Composite Fermions: Magnetoexciton
Dispersions: A microscopic Hamiltonian theory of the FQHE, developed by Shankar and myself
based on the fermionic Chern-Simons approach, has recently been quite
successful in calculating gaps in Fractional Quantum Hall states, and in
predicting approximate... | cond-mat_mes-hall |
Hinge solitons in three-dimensional second-order topological insulators: A second-order topological insulator in three dimensions refers to a
topological insulator with gapless states localized on the hinges, which is a
generalization of a traditional topological insulator with gapless states
localized on the surfaces.... | cond-mat_mes-hall |
Conduction Mechanism in a Molecular Hydrogen Contact: We present first principles calculations for the conductance of a hydrogen
molecule bridging a pair of Pt electrodes. The transmission function has a wide
plateau with T~1 which extends across the Fermi level and indicates the
existence of a single, robust conductan... | cond-mat_mes-hall |
Electronic structure of graphene-nanoribbons on hexagonal boron nitride: Hexagonal boron nitride is an ideal dielectric to form two-dimensional
heterostructures due to the fact that it can be exfoliated to be just few atoms
thick and its a very low density of defects. By placing graphene nanoribbons on
high quality hex... | cond-mat_mes-hall |
Multiwalled Carbon Nanotubes as Building Blocks in Nanoelectronics: Molecular level components, like carbon multiwalled nanotubes (MWNT), show
great potential for future nanoelectronics. At low frequencies, only the
outermost carbon layer determines the transport properties of the MWNT. Due to
the multiwalled structure... | cond-mat_mes-hall |
Non-Hermitian Chiral Magnetic Effect in Equilibrium: We analyze the Chiral Magnetic Effect for non-Hermitian fermionic systems
using the biorthogonal formulation of quantum mechanics. In contrast to the
Hermitian chiral counterparts, we show that the Chiral Magnetic Effect may take
place in thermal equilibrium of an op... | cond-mat_mes-hall |
Moiré Flat Bands of Twisted Few-layer Graphite: We report that the twisted few layer graphite (tFL-graphite) is a new family
of moir\'{e} heterostructures (MHSs), which has richer and highly tunable
moir\'{e} flat band structures entirely distinct from all the known MHSs. A
tFL-graphite is composed of two few-layer gra... | cond-mat_mes-hall |
Robust Ferromagnetism in Silicene Nanoflakes through Patterned
Hydrogenation: Considerably different properties emerge in nanomaterials as a result of
quantum confinement and edge effects. In this study, the electronic and
magnetic properties of quasi zero dimensional silicene nanoflakes (SiNFs) are
investigated usin... | cond-mat_mes-hall |
Impact of electrode density of states on transport through
pyridine-linked single molecule junctions: We study the impact of electrode band structure on transport through
single-molecule junctions by measuring the conductance of pyridine-based
molecules using Ag and Au electrodes. Our experiments are carried out usin... | cond-mat_mes-hall |
SNS junctions in nanowires with spin-orbit coupling: role of confinement
and helicity on the sub-gap spectrum: We study normal transport and the sub-gap spectrum of
superconductor-normal-superconductor (SNS) junctions made of semiconducting
nanowires with strong Rashba spin-orbit coupling. We focus, in particular, on... | cond-mat_mes-hall |
The importance of chemical potential in the determination of water slip
in nanochannels: We investigate the slip properties of water confined in graphite-like
nano-channels by non-equilibrium molecular dynamics simulations, with the aim
of identifying and analyze separately the influence of different physical
quantit... | cond-mat_mes-hall |
Emergent Electromagnetic Induction and Adiabatic Charge Pumping in Weyl
Semimetals: The photovoltaic effect in a Weyl semimetal due to the adiabatic quantum
phase is studied. We particularly focus on the case in which an external ac
electric field is applied to the semimetal. In this setup, we show that a
photocurren... | cond-mat_mes-hall |
Decoherence of Cooper pairs and subgap magnetoconductance of
superconducting hybrids: We demonstrate that electron-electron interactions fundamentally restrict the
penetration length of superconducting correlations into a diffusive normal
metal (N) attached to a superconductor (S). We evaluate the subgap
magnetocondu... | cond-mat_mes-hall |
Thermal transport controlled by intra- and inter-dot Coulomb
interactions in sequential and cotunneling serially-coupled double quantum
dots: We study thermoelectric transport through a serial double quantum dot (DQD)
coupled to two metallic leads with different thermal energies. We take into
account the electron s... | cond-mat_mes-hall |
Cooling of a Micro-mechanical Resonator by the Back-action of Lorentz
Force: Using a semi-classical approach, we describe an on-chip cooling protocol for
a micro-mechanical resonator by employing a superconducting flux qubit. A
Lorentz force, generated by the passive back-action of the resonator's
displacement, can c... | cond-mat_mes-hall |
Charge-spin response and collective excitations in Weyl semimetals: Weyl semimetals are characterized by unconventional electromagnetic response.
We present analytical expressions for all components of the frequency- and
wave-vector-dependent charge-spin linear-response tensor of Weyl fermions. The
spin-momentum lockin... | cond-mat_mes-hall |
Heat dissipation and fluctuations in a driven quantum dot: While thermodynamics is a useful tool to describe the driving of large
systems close to equilibrium, fluctuations dominate the distribution of heat
and work in small systems and far from equilibrium. We study the heat generated
by driving a small system and cha... | cond-mat_mes-hall |
Dynamic vibronic coupling in InGaAs quantum dots: The electron-phonon coupling in self-assembled InGaAs quantum dots is
relatively weak at low light intensities, which means that the zero-phonon line
in emission is strong compared to the phonon sideband. However, the coupling to
acoustic phonons can be dynamically enha... | cond-mat_mes-hall |
Landau Quantized Dynamics and Spectrum of the Diced Lattice: In this work the role of magnetic Landau quantization in the dynamics and
spectrum of Diced Lattice charge carriers is studied in terms of the associated
pseudospin 1 Green's function. The equations of motion for the 9 matrix
elements of this Green's function... | cond-mat_mes-hall |
Carrier Injection and Scattering in Atomically Thin Chalcogenides: Atomically thin two-dimensional chalcogenides such as MoS2 monolayers are
structurally ideal channel materials for the ultimate atomic electronics.
However, a heavy thickness dependence of electrical performance is shown in
these ultrathin materials, an... | cond-mat_mes-hall |
Moiré Imaging in Twisted Bilayer Graphene Aligned on Hexagonal Boron
Nitride: Moir\'e superlattices (MSL) formed in angle-aligned bilayers of van der Waals
materials have become a promising platform to realize novel two-dimensional
electronic states. Angle-aligned trilayer structures can form two sets of MSLs
which c... | cond-mat_mes-hall |
Size dependent optical response in coupled systems of plasmons and
electron-hole pairs in metallic nanostructures: In bulk materials, the collective modes and individual modes are orthogonal
each other, and no connection occurs if there is no damping processes. In the
presence of damping, the collective modes, i.e., ... | cond-mat_mes-hall |
Correlative nanoscale imaging of strained hBN spin defects: Spin defects like the negatively charged boron vacancy color center ($V_B^-$)
in hexagonal boron nitride (hBN) may enable new forms of quantum sensing with
near-surface defects in layered van der Waals heterostructures. Here, we reveal
the effect of strain ass... | cond-mat_mes-hall |
Optical Charge Injection and Full Coherent Control of Spin-Qubit in the
Telecom C-band Emitting Quantum Dot: Solid-state quantum emitters with manipulable spin-qubits are promising
platforms for quantum communication applications. Although such light-matter
interfaces could be realized in many systems only a few allo... | cond-mat_mes-hall |
Comparing two different descriptions of the I-V characteristic of
graphene: theory and experiment: The formalism of the nonperturbative description of transport phenomena in
graphene on the framework of the quantum kinetic equation for the
Schwinger-like process is compared with the description on the basis of
Zener-... | cond-mat_mes-hall |
Topological magnetic crystalline insulators and co-representation theory: Gapless surface states of time reversal invariant topological insulators are
protected by the anti-unitary nature of the time reversal operation. Very
recently, this idea was generalized to magnetic structures, in which time
reversal symmetry is ... | cond-mat_mes-hall |
Fano resonance in discrete lattice models: controlling lineshapes with
impurities: The possibility of controlling Fano lineshapes in the electronic transmission
is addressed in terms of a simple discrete model within a tight binding
framework, in which a finite sized ordered chain is coupled from one side to an
infin... | cond-mat_mes-hall |
Band Symmetries and Singularities in Twisted Multilayer Graphene: The electronic spectra of rotationally faulted graphene bilayers are
calculated using a continuum formulation for small fault angles that identifies
two distinct electronic states of the coupled system. The low energy spectra of
one state features a Ferm... | cond-mat_mes-hall |
Mechanical properties of carbynes investigated by ab initio total-energy
calculations: As sp carbon chains (carbynes) are relatively rigid molecular objects, can we
exploit them as construction elements in nanomechanics? To answer this
question, we investigate their remarkable mechanical properties by ab-initio
total... | cond-mat_mes-hall |
Spin-valley filtering in strained graphene structures with artificially
induced carrier mass and spin-orbit coupling: The interplay of massive electrons with spin-orbit coupling in bulk graphene
results in a spin-valley dependent gap. Thus, a barrier with such properties
can act as a filter, transmitting only opposit... | cond-mat_mes-hall |
Mechanisms of radiation-induced degradation of hybryd perovskites based
solar cells and ways to increase their radiation tolerance: The basic processes of perovskite radiation resistance are discussed for
photo- and high-energy electron irradiation. It is shown that ionization of
iodine ions and a staged mechanism of... | cond-mat_mes-hall |
Slowing down of spin relaxation in two dimensional systems by quantum
interference effects: The effect of weak localization on spin relaxation in a two-dimensional
system with a spin-split spectrum is considered. It is shown that the spin
relaxation slows down due to the interference of electron waves moving along
cl... | cond-mat_mes-hall |
Non-equilibrium spin-crossover in copper phthalocyanine: We demonstrate the tip induced control of the spin state of copper
phthalocyanine (CuPc) on an insulator coated substrate. Accounting for
electronic correlations, we find that, under the condition of energetic
proximity of neutral excited states to the anionic gr... | cond-mat_mes-hall |
Low field magnetotransport in strained Si/SiGe cavities: Low field magnetotransport revealing signatures of ballistic transport
effects in strained Si/SiGe cavities is investigated. We fabricated strained
Si/SiGe cavities by confining a high mobility Si/SiGe 2DEG in a bended nanowire
geometry defined by electron-beam l... | cond-mat_mes-hall |
Large insulating nitride islands on Cu3Au as a template for atomic spin
structures: We present controlled growth of c(2$\times$2)N islands on the (100) surface
of Cu$_3$Au, which can be used as an insulating surface template for
manipulation of magnetic adatoms. Compared to the commonly used
Cu(100)/c(2$\times$2)N su... | cond-mat_mes-hall |
Anomalously large g-factor of single atoms adsorbed on a metal substrate: We have performed inelastic scanning tunneling spectroscopy (ISTS) on
individual Fe atoms adsorbed on a Ag(111) surface. ISTS reveals a magnetization
excitation with a lifetime of about 400 fsec which decreases linearly upon
application of a magn... | cond-mat_mes-hall |
Electricity Harvested from Ambient Heat across Silicon Surface: We report that electricity can be generated from limitless thermal motion of
ions by two dimensional (2D) surface of silicon wafer at room temperature. A
typical silicon device, on which asymmetric electrodes with Au and Ag thin
films were fabricated, can ... | cond-mat_mes-hall |
Ge/Si nanowire mesoscopic Josephson junctions: The controlled growth of nanowires (NWs) with dimensions comparable to the
Fermi wavelengths of the charge carriers allows fundamental investigations of
quantum confinement phenomena. Here, we present studies of proximity-induced
superconductivity in undoped Ge/Si core/she... | cond-mat_mes-hall |
Scalar-Interchange Potential and Magnetic/Thermodynamic Properties of
Graphene-like Materials: By means of numerical simulations, we explore possible effects of a special
interparticle interaction potential which is a function of external and
internal conditions of graphene-like systems. In addition to the
electromag... | cond-mat_mes-hall |
Induced magneto-conductivity in a two-node Weyl semimetal under Gaussian
random disorder: Measuring the magnetoconductivity induced from impurities may help determine
the impurity distribution and reveal the structure of a Weyl semimetal sample.
To verify this, we utilized the Gaussian random disorder to simulate cha... | cond-mat_mes-hall |
Spin Hall magnetoresistance in antiferromagnet/heavy-metal
heterostructures: We investigate the spin Hall magnetoresistance in thin film bilayer
heterostructures of the heavy metal Pt and the antiferromagnetic insulator NiO.
While rotating an external magnetic field in the easy plane of NiO, we record
the longitudina... | cond-mat_mes-hall |
Inverse design of reconfigurable piezoelectric topological phononic
plates: We present a methodology to perform inverse analysis on reconfigurable
topological insulators for flexural waves in plate-like structures. First the
unit cell topology of a phononic plate is designed, which offers two-fold
degeneracy in the b... | cond-mat_mes-hall |
Temperature dependent electrical resistivity of a single strand of
ferromagnetic single crystalline nanowire: We have measured the electrical resistivity of a single strand of a
ferromagnetic Ni nanowire of diameter 55 nm using a 4-probe method in the
temperature range 3 K-300 K. The wire used is chemically pure and ... | cond-mat_mes-hall |
Second- and third-order optical susceptibilities in bidimensional
semiconductors near excitons states: Semiconducting Transition Metal Dichalcogenides (TMDs) have significant
nonlinear optical effects. In this work we have used second-harmonic generation
(SHG) and the four-wave mixing (FWM) spectroscopy in resonance ... | cond-mat_mes-hall |
Unified theory of quantum phase transitions in quantum dots with gapped
host bands: We present a unified theory of quantum phase transitions for half-filled
quantum dots (QDs) coupled to gapped host bands. We augment the bands by
additional weakly coupled metallic lead which allows us to analyze the system
by using s... | cond-mat_mes-hall |
Gate errors in solid state quantum computer architectures: We theoretically consider possible errors in solid state quantum computation
due to the interplay of the complex solid state environment and gate
imperfections. In particular, we study two examples of gate operations in the
opposite ends of the gate speed spect... | cond-mat_mes-hall |
Describing non-Hermitian dynamics using a Generalized Three-Time NEGF
for a Partition-free Molecular Junction with Electron-Phonon Coupling: In this paper we develop the Non-Equilibrium Green's Function (NEGF)
formalism for a dissipative molecular junction that consists of a central
molecular system with one-dimensio... | cond-mat_mes-hall |
Few-electron eigenstates of concentric double quantum rings: Few-electron eigenstates confined in coupled concentric double quantum rings
are studied by the exact diagonalization technique. We show that the magnetic
field suppresses the tunnel coupling between the rings localizing the
single-electron states in the inte... | cond-mat_mes-hall |
One-Dimensional Quantum Confinement Effect Modulated Thermoelectric
Properties in InAs Nanowires: We report electrical conductance and thermopower measurements on InAs
nanowires synthesized by chemical vapor deposition. Gate modulation of the
thermopower of individual InAs nanowires with diameter around 20nm is obtai... | cond-mat_mes-hall |
Combining micro- and macroscopic probes to untangle single-ion and
spatial exchange anisotropies in a $S = 1$ quantum antiferromagnet: The magnetic ground state of the quasi-one-dimensional spin-1
antiferromagnetic chain is sensitive to the relative sizes of the single-ion
anisotropy ($D$) and the intrachain ($J$) an... | cond-mat_mes-hall |
Determination of universal critical exponents using Lee-Yang theory: Lee-Yang zeros are points in the complex plane of an external control
parameter at which the partition function vanishes for a many-body system of
finite size. In the thermodynamic limit, the Lee-Yang zeros approach the
critical value on the real-axis... | cond-mat_mes-hall |
Coherent transport in linear arrays of quantum dots: the effects of
period doubling and of quasi-periodicity: We evaluate the phase-coherent transport of electrons along linear structures
of varying length, which are made from two types of potential wells set in
either a periodic or a Fibonacci quasi-periodic sequenc... | cond-mat_mes-hall |
Orbital gyrotropic magneto-electric effect and its strain engineering in
monolayer Nb$X_2$: Electrical control of the orbital degrees of freedom is an important area of
research in the emerging field of "orbitronics." Orbital {\it gyrotropic}
magneto-electric effect (OGME) is the generation of an orbital magnetizatio... | cond-mat_mes-hall |
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