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Intrinsic giant Stark effect of boron-carbon-nitride nanoribbons with
zigzag edges: Electronic properties of zigzag boron-carbon-nitride (BCN) nanoribbons, where
the outermost C atoms on the edges of graphene nanoribbons are replaced by B or
N atoms, are theoretically studied using the first-principles calculations. ... | cond-mat_mes-hall |
Kondo effect in coupled quantum dots with RKKY interaction: Finite
temperature and magnetic field effects: We study transport through two quantum dots coupled by an RKKY interaction as
a function of temperature and magnetic field. By applying the Numerical
Renormalization Group (NRG) method we obtain the transmission... | cond-mat_mes-hall |
Skyrmion dynamics in quantum Hall ferromagnets: Exploring a classical solution of the non-linear sigma model for a quantum
Hall ferromagnet, a skyrmion-magnon effective hamiltonian is obtained via the
collective coordinates method. Using the Feynman-Vernon functional integral
formalism for this model we find the temper... | cond-mat_mes-hall |
Electronic transport of folded graphene nanoribbons: We investigate the electronic transport properties of a folded graphene
nanoribbon with monolayer nanoribbon contacts. We consider two possible
foldings: either the nanoribbon can be folded onto itself in the shape of a
hairpin with the nanoribbon leads at a $0^\circ... | cond-mat_mes-hall |
Intrinsic spin-orbit torque in an antiferromagnet with a weakly
noncollinear spin configuration: An antiferromagnet is a promising material for spin-orbit torque generation.
Earlier studies of the spin-orbit torque in an antiferromagnet are limited to
collinear spin configurations. We calculate the spin-orbit torque ... | cond-mat_mes-hall |
Magnetoplasmon excitations in arrays of circular and noncircular quantum
dots: We have investigated the magnetoplasmon excitations in arrays of circular and
noncircular quantum dots within the Thomas-Fermi-Dirac-von Weizs\"acker
approximation. Deviations from the ideal collective excitations of isolated
parabolically... | cond-mat_mes-hall |
Theoretical Study of Electrical Conduction Through a Molecule Connected
to Metallic Nanocontacts: We present a theoretical study of electron transport through a molecule
connected to two metallic nanocontacts. The system investigated is 1,4
benzene-dithiolate (BDT) chemically bonded to two Au contacts. The surface
ch... | cond-mat_mes-hall |
Kondo physics in tunable semiconductor nanowire quantum dots: We have observed the Kondo effect in strongly coupled semiconducting nanowire
quantum dots. The devices are made from indium arsenide nanowires, grown by
molecular beam epitaxy, and contacted by titanium leads. The device
transparency can be tuned by changin... | cond-mat_mes-hall |
Peierls-type Instability and Tunable Band Gap in Functionalized Graphene: Functionalizing graphene was recently shown to have a dramatic effect on the
electronic properties of this material. Here we investigate spatial ordering of
adatoms driven by the RKKY-type interactions. In the ordered state, which
arises via a Pe... | cond-mat_mes-hall |
Terahertz lasing from intersubband polariton-polariton scattering in
asymmetric quantum wells: Electric dipole transitions between different cavity polariton branches or
between dressed atomic states with the same excitation number are strictly
forbidden in centro-symmetric systems. For doped quantum wells in semicon... | cond-mat_mes-hall |
Detection of quantum interference without interference: Quantum interference is typically detected through the dependence of the
interference signal on certain parameters (path length, Aharonov-Bohm flux,
etc.), which can be varied in a controlled manner. The destruction of
interference by a which-path measurement is a... | cond-mat_mes-hall |
Thermodynamics of a Single Mesoscopic Phononic Mode: In recent decades, the laws of thermodynamics have been pushed down to
smaller and smaller scales, within the field of stochastic thermodynamics and
state-of-art experiments performed on mesoscopic systems. These measurements
concern electrons, photons, and mesoscopi... | cond-mat_mes-hall |
Unexpected Gaussian line shapes reveal electron-adsorbate interaction as
dominant broadening mechanism in quantum corrals: Understanding the factors influencing the lifetime of electronic states in
artificial quantum structures is of great significance for advancing quantum
technologies. This study focuses on CO-base... | cond-mat_mes-hall |
Fast, low-current spin-orbit torque switching of magnetic tunnel
junctions through atomic modifications of the free layer interfaces: Future applications of spin-orbit torque will require new mechanisms to
improve the efficiency for switching nanoscale magnetic tunnel junctions
(MTJs), while also controlling the magn... | cond-mat_mes-hall |
Onset of optical-phonon cooling in multilayer graphene revealed by RF
noise and black-body radiation thermometries: We report on electron cooling power measurements in few-layer graphene
excited by Joule heating by means of a new setup combining electrical and
optical probes of the electron and phonon baths temperatu... | cond-mat_mes-hall |
Demonstration of Entanglement of Electrostatically Coupled
Singlet-Triplet Qubits: Quantum computers have the potential to solve certain interesting problems
significantly faster than classical computers. To exploit the power of a
quantum computation it is necessary to perform inter-qubit operations and
generate enta... | cond-mat_mes-hall |
Confinement and Fermion Doubling Problem in Dirac-like Hamiltonians: We investigate the interplay between confinement and the fermion doubling
problem in Dirac-like Hamiltonians. Individually, both features are well known.
First, simple electrostatic gates do not confine electrons due to the Klein
tunneling. Second, a ... | cond-mat_mes-hall |
Ion-beam nanopatterning of silicon surfaces under co-deposition of
non-silicide-forming impurities: We report experiments on surface nanopatterning of Si targets which are
irradiated with 2 keV Ar + ions impinging at near-glancing incidence, under
concurrent co-deposition of Au impurities simultaneously extracted fro... | cond-mat_mes-hall |
Lateral plasmonic crystals: Tunability, dark modes, and weak-to-strong
coupling transition: We study transmission of the terahertz radiation through a two-dimensional
electron gas with a concentration controlled by grating gate electrodes.
Voltage applied to these electrodes creates a lateral plasmonic crystal with a... | cond-mat_mes-hall |
On the possibility of the fractional ac Josephson effect in
non-topological conventional superconductor-normal-superconductor junctions: Topological superconductors supporting Majorana Fermions with non-abelian
statistics are presently a subject of intense theoretical and experimental
effort. It has been proposed tha... | cond-mat_mes-hall |
Phononic bandgap nano-acoustic cavity with ultralong phonon lifetime: We present measurements at millikelvin temperatures of the
microwave-frequency acoustic properties of a crystalline silicon nanobeam
cavity incorporating a phononic bandgap clamping structure for acoustic
confinement. Utilizing pulsed laser light to ... | cond-mat_mes-hall |
Electron cooling with graphene-insulator-superconductor tunnel junctions
and applications to fast bolometry: Electronic cooling in hybrid normal metal-insulator-superconductor junctions
is a promising technology for the manipulation of thermal loads in solid state
nanosystems. One of the main bottlenecks for efficien... | cond-mat_mes-hall |
Phonon wave packet emission during state preparation of a semiconductor
quantum dot using different schemes: The carrier-phonon interaction in semiconductor quantum dots can greatly
affect the optical preparation of the excited state. For resonant excitation
used in the Rabi preparation scheme, the polaron is formed ... | cond-mat_mes-hall |
Imaging electron flow from collimating contacts in graphene: The ballistic motion of electrons in graphene encapsulated in hexagonal boron
nitride (hBN) promises exciting opportunities for electron-optics devices. A
narrow electron beam is desired, with both the mean free path and coherence
length exceeding the device ... | cond-mat_mes-hall |
Electronic bandstructure and optical gain of lattice matched III-V
dilute nitride bismide quantum wells for 1.55 $μ$m optical communication
systems: Dilute nitride bismide GaNBiAs is a potential semiconductor alloy for near-
and mid-infrared applications, particularly in 1.55 $\mu$m optical
communication systems. I... | cond-mat_mes-hall |
Sideband ground-state cooling of graphene with Rydberg atoms via vacuum
forces: We present a scheme leading to ground-state cooling of the fundamental
out-of-plane (flexural) mode of a suspended graphene sheet. Our proposal
exploits the coupling between a driven Rydberg atom and the graphene resonator,
which is enabl... | cond-mat_mes-hall |
Decoupling of the many-body effects from the electron mass in GaAs by
means of reduced dimensionality: Determining the (bare) electron mass $m_0$ in crystals is often hindered by
many-body effects since Fermi-liquid physics renormalises the band mass, making
the observed effective mass $m^*$ depend on density. Here, ... | cond-mat_mes-hall |
Probing topological protected transport in finite-sized
Su-Schrieffer-Heeger chains: In order to transport information with topological protection, we reveal and
demonstrate experimentally the existence of a characteristic length $L_c$,
coined as the transport length, in the bulk size for edge states in
one-dimension... | cond-mat_mes-hall |
A study on the universality of the magnetic-field-induced phase
transitions in the two-dimensional electron system in an AlGaAs/GaAs
heterostructure: Plateau-plateau (P-P) and insulator-quantum Hall conductor (I-QH) transitions
are observed in the two-dimensional electron system in an AlGaAs/GaAs
heterostructure. A... | cond-mat_mes-hall |
Current noise of a superconducting single electron transistor coupled to
a resonator: We analyze the current and zero-frequency current noise properties of a
superconducting single electron resonator (SSET) coupled to a resonator,
focusing on the regime where the SSET is operated in the vicinity of the
Josephson quas... | cond-mat_mes-hall |
Magnetotransport in graphene on silicon side of SiC: We have studied the transport properties of graphene grown on silicon side of
SiC. Samples under study have been prepared by two different growth methods in
two different laboratories. Magnetoresistance and Hall resistance have been
measured at temperatures between 4... | cond-mat_mes-hall |
Resonant single and multi-photon coherent transitions in a detuned
regime: We performed quantum manipulations of the multi-level spin system S=5/2 of a
Mn$^{2+}$ ion, by means of a two-tone pulse drive. The detuning between the
excitation and readout radio frequency pulses allows one to select the number
of photons i... | cond-mat_mes-hall |
Self-Focusing Skyrmion Racetracks in Ferrimagnets: We theoretically study the dynamics of ferrimagnetic skyrmions in
inhomogeneous metallic films close to the angular momentum compensation point.
In particular, it is shown that the line of the vanishing angular momentum can
be utilized as a self-focusing racetrack for ... | cond-mat_mes-hall |
Dynamics of hole singlet triplet qubits with large g-factor differences: The spin-orbit interaction is the key element for electrically tunable spin
qubits. Here we probe the effect of cubic Rashba spin-orbit interaction on
mixing of the spin states by investigating singlet-triplet oscillations in a
planar Ge hole doub... | cond-mat_mes-hall |
Bilayer graphene: gap tunability and edge properties: Bilayer graphene -- two coupled single graphene layers stacked as in graphite
-- provides the only known semiconductor with a gap that can be tuned
externally through electric field effect. Here we use a tight binding approach
to study how the gap changes with the a... | cond-mat_mes-hall |
Manipulation of edge states in microwave artificial graphene: Edge states are one important ingredient to understand transport properties
of graphene nanoribbons. We study experimentally the existence and the internal
structure of edge states under uniaxial strain of the three main edges: zigzag,
bearded, and armchair.... | cond-mat_mes-hall |
Direct electronic measurement of the spin Hall effect: The generation, manipulation and detection of spin-polarized electrons in
nanostructures define the main challenges of spin-based electronics[1]. Amongst
the different approaches for spin generation and manipulation, spin-orbit
coupling, which couples the spin of a... | cond-mat_mes-hall |
Exciton-phonon-scattering: A competition between bosonic and fermionic
nature of bound electron-hole pairs: The question of macroscopic occupation and spontaneous emergence of coherence
for exciton ensembles has gained renewed attention due to the rise of van der
Waals heterostructures made of atomically thin semicon... | cond-mat_mes-hall |
Spin-orbit coupling and the static polarizability of single-wall carbon
nanotubes: We calculate the static longitudinal polarizability of single-wall carbon
nanotubes in the long wavelength limit taking into account spin-orbit effects.
We use a four-orbital orthogonal tight-binding formalism to describe the
electroni... | cond-mat_mes-hall |
4$π$ and 8$π$ dual Josephson effects induced by symmetry defects: In topological insulator edges, the duality between the Zeeman field
orientation and the proximitized superconducting phase has been recently
exploited to predict a magneto-Josephson effect with a 4$\pi$ periodicity. We
revisit this latter Josephson effe... | 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 |
TSTG II: Projected Hartree-Fock Study of Twisted Symmetric Trilayer
Graphene: The Hamiltonian of the magic-angle twisted symmetric trilayer graphene (TSTG)
can be decomposed into a TBG-like flat band Hamiltonian and a high-velocity
Dirac fermion Hamiltonian. We use Hartree-Fock mean field approach to study the
projec... | cond-mat_mes-hall |
Quantum pumping in graphene: We show that graphene-based quantum pumps can tap into evanescent modes,
which penetrate deeply into the device as a consequence of Klein tunneling. The
evanescent modes dominate pumping at the Dirac point, and give rise to a
universal response under weak driving for short and wide pumps, i... | cond-mat_mes-hall |
Localized surface plasmons in a continuous and flat graphene sheet: We derive an integral equation describing surface-plasmon polaritons in
graphene deposited on a substrate with a planar surface and a dielectric
protrusion in the opposite surface of the dielectric slab. We show that the
problem is mathematically equiv... | cond-mat_mes-hall |
Stabilization of single-electron pumps by high magnetic fields: We study the effect of perpendicular magnetic fields on a single-electron
system with a strongly time-dependent electrostatic potential. Continuous
improvements to the current quantization in these electron pumps are revealed
by high-resolution measurement... | cond-mat_mes-hall |
Even-odd effects in NSN scattering problems: Application to graphene
nanoribbons: We study crossed Andreev reflection (CAR) of electrons or holes in normal
metal-superconductor-normal metal junctions and highlight some very strong
effects of the underlying lattice. In particular, we demonstrate that for sharp
interfa... | cond-mat_mes-hall |
Effect of picosecond magnetic pulse on dynamics of electron's subbands
in semiconductor bilayer nanowire: We report on possibility of charge current generation in nanowire made of two
tunnel coupled one-dimensional electron waveguides by means of single magnetic
pulse lasting up to 20 ps. Existence of interlayer tunn... | cond-mat_mes-hall |
Control of Spin Dynamics of Excitons in Nanodots for Quantum Operations: This work presents a step furthering a new perspective of proactive control
of the spin-exciton dynamics in the quantum limit. Laser manipulation of
spin-polarized optical excitations in a semiconductor nanodot is used to
control the spin dynamics... | cond-mat_mes-hall |
Coupling single photons from discrete quantum emitters in WSe$_2$ to
lithographically defined plasmonic slot-waveguides: We report the observation of the generation and routing of single plasmons
generated by localized excitons in a WSe$_2$ monolayer flake exfoliated onto
lithographically defined Au-plasmonic wavegui... | cond-mat_mes-hall |
Floquet multi-gap topology: Non-Abelian braiding and anomalous Dirac
string phase: Topological phases of matter span a wide area of research shaping fundamental
pursuits and offering promise for future applications. While a significant
fraction of topological materials has been characterized using symmetry
requiremen... | cond-mat_mes-hall |
Optical Probing of the Spin Polarization of the nu=5/2 Quantum Hall
State: We apply polarization resolved photoluminescence spectroscopy to measure the
spin polarization of a two dimensional electron gas in perpendicular magnetic
field. In the vicinity of filling factor nu=5/2, we observe a sharp
discontinuity in the... | cond-mat_mes-hall |
Anisotropy of spin relaxation and transverse transport in metals: Using first principles methods we explore the anisotropy of the spin
relaxation and transverse transport properties in bulk metals with respect to
the direction of the spin quantization axis in paramagnets or of the
spontaneous magnetization in ferromagn... | cond-mat_mes-hall |
Magnetotransport in multi-Weyl semimetals: A kinetic theory approach: We study the longitudinal magnetotransport in three-dimensional multi-Weyl
semimetals, constituted by a pair of (anti)-monopole of arbitrary integer
charge ($n$), with $n=1,2$ and $3$ in a crystalline environment. For any $n>1$,
even though the distr... | cond-mat_mes-hall |
Giant spin-orbit torque in a single ferrimagnetic metal layer: Antiferromagnets and compensated ferrimagnets offer opportunities to
investigate spin dynamics in the 'terahertz gap' because their resonance modes
lie in the 0.3 THz to 3 THz range. Despite some inherent advantages when
compared to ferromagnets, these mate... | cond-mat_mes-hall |
Growth and Optical Properties Investigation of Pure and Al-doped SnO2
Nanostructures by Sol-Gel Method: SnO2 nanoparticles with different percentage of Al (5%, 15%, and25%) were
synthesized by sol-gel method. The structure and nature of nanoparticles are
determined by of X-ray diffraction analysis. Also morphology of... | cond-mat_mes-hall |
Gate-induced magneto-oscillation phase anomalies in graphene bilayers: The magneto-oscillations in graphene bilayers are studied in the vicinity of
the K and K' points of the Brillouin zone within the four-band continuum model
ased on the simplest tight-binding approximation involving only the nearest
neighbor interact... | cond-mat_mes-hall |
Nonabelian magnonics in antiferromagnets: We present a semiclassical formalism for antiferromagnetic (AFM) magnonics
which promotes the central ingredient of spin wave chirality, encoded in a
quantity called magnonic isospin, to a first-class citizen of the theory. We
use this formalism to unify results of interest fro... | cond-mat_mes-hall |
A Compact Approximate Solution to the Friedel-Anderson Impuriy Problem: An approximate groundstate of the Anderson-Friedel impurity problem is
presented in a very compact form. It requires solely the optimization of two
localized electron states and consists of four Slater states (Slater
determinants). The resulting si... | cond-mat_mes-hall |
Coherent phonon Rabi oscillations with a high frequency carbon nanotube
phonon cavity: Phonon-cavity electromechanics allows the manipulation of mechanical
oscillations similar to photon-cavity systems. Many advances on this subject
have been achieved in various materials. In addition, the coherent phonon
transfer (p... | cond-mat_mes-hall |
Decoherence of two entangled spin qubits coupled to an interacting
sparse nuclear spin bath: application to nitrogen vacancy centers: We consider pure dephasing of Bell states of electron spin qubits interacting
with a sparse bath of nuclear spins. Using the newly developed two-qubit
generalization of cluster correla... | cond-mat_mes-hall |
Zero-point fluctuations in the ground state of a mesoscopic normal ring: We investigate the persistent current of a ring with an in-line quantum dot
capacitively coupled to an external circuit. Of special interest is the
magnitude of the persistent current as a function of the external impedance in
the zero temperature... | cond-mat_mes-hall |
Entanglement genesis by ancilla-based parity measurement in 2D circuit
QED: We present an indirect two-qubit parity meter in planar circuit quantum
electrodynamics, realized by discrete interaction with an ancilla and a
subsequent projective ancilla measurement with a dedicated, dispersively
coupled resonator. Quantu... | cond-mat_mes-hall |
Graphene Plasmonics: a Novel Fully Atomistic Approach for Realistic
Structures: We demonstrate that the plasmonic properties of realistic graphene and
graphene-based materials can effectively and accurately be modeled by a novel,
fully atomistic, yet classical, approach, named $\omega$FQ. Such model is able
to reprod... | cond-mat_mes-hall |
Spin-Orbit Based Coherent Spin Ratchets: The concept of ratchets, driven asymmetric periodic structures giving rise to
directed particle flow, has recently been generalized to a quantum ratchet
mechanism for spin currents mediated through spin-orbit interaction. Here we
consider such systems in the coherent mesoscopic ... | cond-mat_mes-hall |
Decoherence in qubits due to low-frequency noise: The efficiency of the future devices for quantum information processing is
limited mostly by the finite decoherence rates of the qubits. Recently a
substantial progress was achieved in enhancing the time, which a solid-state
qubit demonstrates a coherent dynamics. This ... | cond-mat_mes-hall |
Perspective on Coupled Colloidal Quantum Dot Molecules: Electronic coupling and hence hybridization of atoms serve as the basis for
the rich properties of the endless library of naturally occurring molecules.
Colloidal quantum dots (CQDs) manifesting quantum strong confinement, possess
atomic like characteristics with ... | cond-mat_mes-hall |
Quantum Coherence at Low Temperatures in Mesoscopic Systems: Effect of
Disorder: We study the disorder dependence of the phase coherence time of quasi
one-dimensional wires and two-dimensional (2D) Hall bars fabricated from a high
mobility GaAs/AlGaAs heterostructure. Using an original ion implantation
technique, we ... | cond-mat_mes-hall |
Quasi-Periodic Nanoripples in Graphene Grown by Chemical Vapor
Deposition and Its Impact on Charge Transport: The technical breakthrough in synthesizing graphene by chemical vapor
deposition methods (CVD) has opened up enormous opportunities for large-scale
device applications. In order to improve the electrical prop... | cond-mat_mes-hall |
Numerical Analysis of the Anderson Localization: The aim of this paper is to demonstrate, by simple numerical simulations, the
main transport properties of disordered electron systems. | cond-mat_mes-hall |
Quantum Phenomena in Low-Dimensional Systems: A brief summary of the physics of low-dimensional quantum systems is given.
The material should be accessible to advanced physics undergraduate students.
References to recent review articles and books are provided when possible. | cond-mat_mes-hall |
Observation of charged excitons in hole-doped carbon nanotubes using
photoluminescence and absorption spectroscopy: We report the first observation of trions (charged excitons), three-particle
bound states consisting of one electron and two holes, in hole-doped carbon
nanotubes at room temperature. When p-type dopant... | cond-mat_mes-hall |
Giant Interaction-Induced Gap and Electronic Phases in Rhombohedral
Trilayer Graphene: Due to their unique electron dispersion and lack of a Fermi surface, Coulomb
interactions in undoped two-dimensional Dirac systems, such as single, bi- and
tri-layer graphene, can be marginal or relevant. Relevant interactions can
... | cond-mat_mes-hall |
Quantum Hall system in Tao-Thouless limit: We consider spin-polarized electrons in a single Landau level on a torus. The
quantum Hall problem is mapped onto a one-dimensional lattice model with
lattice constant $2\pi/L_1$, where $L_1$ is a circumference of the torus (in
units of the magnetic length). In the Tao-Thoules... | cond-mat_mes-hall |
Quantum manipulation in a Josephson LED: We access the suitability of the recently proposed Josephson LED for quantum
manipulation purposes. We show that the device can both be used for on-demand
production of entangled photon pairs and operated as a two-qubit gate. Besides,
one can entangle particle spin with photon p... | cond-mat_mes-hall |
Model for Topological Phononics and Phonon Diode: The quantum anomalous Hall effect, an exotic topological state first
theoretically predicted by Haldane and recently experimentally observed, has
attracted enormous interest for low-power-consumption electronics. In this
work, we derived a Schr{\"o}dinger-like equation ... | cond-mat_mes-hall |
Scaling of intrinsic domain wall magneto-resistance with confinement in
electromigrated nanocontacts: In this work we study the evolution of intrinsic domain wall
magnetoresistance (DWMR) with domain wall confinement. Clean permalloy notched
half-ring nanocontacts are fabricated using a special ultra-high vacuum
elec... | cond-mat_mes-hall |
Plasmons enhance near-field radiative heat transfer for graphene-covered
dielectrics: It is shown that a graphene layer on top of a dielectric slab can
dramatically influence the ability of this dielectric for radiative heat
exchange. Effect of graphene is related to thermally excited plasmons.
Frequency of these res... | cond-mat_mes-hall |
Exciton Polaritons in a Two-Dimensional Lieb Lattice with Spin-Orbit
Coupling: We study exciton-polaritons in a two-dimensional Lieb lattice of
micropillars. The energy spectrum of the system features two flat bands formed
from $S$ and $P_{x,y}$ photonic orbitals, into which we trigger bosonic
condensation under high... | cond-mat_mes-hall |
Quantum thermodynamics in a single-electron box: This chapter provides an overview of the methods and results for quantum
thermodynamic experiments with single-electron devices. The experiments with a
single-electron box on Jarzynski equality and Crooks relation, two-temperature
fluctuation relations, and Maxwell's dem... | cond-mat_mes-hall |
$Γ(2)$ modular symmetry, renormalization, group flow and the
quantum Hall effect: We construct a family of holomorphic $\beta$-functions whose RG flow
preserves the $\Gamma(2)$ modular symmetry and reproduces the observed
stability of the Hall plateaus. The semi-circle law relating the longitudinal
and Hall conductiv... | cond-mat_mes-hall |
Origin of Discrepancies in Inelastic Electron Tunneling Spectra of
Molecular Junctions: We report inelastic electron tunneling spectroscopy (IETS) of multilayer
molecular junctions with and without incorporated metal nano-particles. The
incorporation of metal nanoparticles into our devices leads to enhanced IET
inten... | cond-mat_mes-hall |
Influence of MgO tunnel barrier thickness on spin-transfer ferromagnetic
resonance and torque in magnetic tunnel junctions: Spin-transfer ferromagnetic resonance (ST-FMR) in symmetric magnetic tunnel
junctions (MTJs) with a varied thickness of the MgO tunnel barrier (0.75 nm <
$t_{MgO}$ < 1.05 nm) is studied using th... | cond-mat_mes-hall |
Hole Flying Qubits in Quantum Dot Arrays: Quantum information transfer is fundamental for scalable quantum computing in
any potential platform and architecture. Hole spin qubits, owing to their
intrinsic spin-orbit interaction (SOI), promise fast quantum operations which
are fundamental for the implementation of quantu... | cond-mat_mes-hall |
Tunable microwave impedance matching to a high impedance source using a
Josephson metamaterial: We report the efficient coupling of a $50\,\Omega$ microwave circuit to a
high impedance conductor. We use an impedance transformer consisting of a
$\lambda/4$ co-planar resonator whose inner conductor contains an array of... | cond-mat_mes-hall |
Elementary Charge Transfer Processes in Mesoscopic Conductors: We determine charge transfer statistics in a quantum conductor driven by a
time-dependent voltage and identify the elementary transport processes. At zero
temperature unidirectional and bidirectional single charge transfers occur. The
unidirectional process... | cond-mat_mes-hall |
Anomalous zero-temperature magnetopolaronic blockade of resonant
electron tunneling in Majorana-resonant-level single-electron transistor: The magnetopolaronic generalization of a Majorana-resonant-level (MRL) model
is considered for a single-level vibrating quantum dot coupled to two
half-infinite $g=1/2$ Tomonaga-L... | cond-mat_mes-hall |
Alternating currents and shear waves in viscous electronics: Strong interaction among charge carriers can make them move like viscous
fluid. Here we explore alternating current (AC) effects in viscous electronics.
In the Ohmic case, incompressible current distribution in a sample adjusts fast
to a time-dependent voltag... | cond-mat_mes-hall |
Cyclotron Resonance Assisted Photocurrents in Surface States of a 3D
Topological Insulator Based on a Strained High Mobility HgTe Film: We report on the observation of cyclotron resonance induced photocurrents,
excited by continuous wave terahertz radiation, in a 3D topological insulator
(TI) based on an 80 nm strain... | cond-mat_mes-hall |
Dirac Theory and Topological Phases of Silicon Nanotube: Silicon nanotube is constructed by rolling up a silicene, i.e., a monolayer
of silicon atoms forming a two-dimensional honeycomb lattice. It is a
semiconductor or an insulator owing to relatively large spin-orbit interactions
induced by its buckled structure. The... | cond-mat_mes-hall |
Experimental demonstrations of high-Q superconducting coplanar waveguide
resonators: We designed and successfully fabricated an absorption-type of superconducting
coplanar waveguide (CPW) resonators. The resonators are made from a Niobium
film (about 160 nm thick) on a high-resistance Si substrate, and each resonator... | cond-mat_mes-hall |
Nano-ironing van der Waals Heterostructures Towards Electrically
Controlled Quantum Dots: Assembling two-dimensional van der Waals layered materials into
heterostructures is an exciting development that sparked the discovery of rich
correlated electronic phenomena and offers possibilities for designer device
applicat... | cond-mat_mes-hall |
Operation of graphene quantum Hall resistance standard in a cryogen-free
table-top system: We demonstrate quantum Hall resistance measurements with metrological
accuracy in a small cryogen-free system operating at a temperature of around
3.8K and magnetic fields below 5T. Operating this system requires little
experim... | cond-mat_mes-hall |
High thermoelectric performance in excitonic bilayer graphene: We consider the excitonic effects on the thermal properties in the AB-stacked
bilayer graphene. The calculations are based on the bilayer generalization of
the usual Hubbard model at the half-filling. The full interaction bandwidth is
used without any low-e... | cond-mat_mes-hall |
Exotic plasma as classical Hall Liquid: A non-relativistic plasma model endowed with an ``exotic'' structure
associated with the two-parameter central extension of the planar Galilei group
is constructed. Introducing a Chern-Simons statistical gauge field provides us
with a self-consistent system; when the magnetic fie... | cond-mat_mes-hall |
Majorana edge modes of topological exciton condensate with
superconductors: I study the edge states of the topological exciton condensate formed by
Coulomb interaction between two parallel surfaces of a strong topological
insulator. When the condensate is contacted by superconductors with a {\pi}
phase shift across t... | cond-mat_mes-hall |
Sign changes and resonance of intrinsic spin Hall effect in
two-dimensional hole gas: The intrinsic spin Hall conductance shows rich sign changes by applying a
perpendicular magnetic field in a two-dimensional hole gas. Especially, a
notable sign changes can be achieved by adjusting the characteristic length of
the R... | cond-mat_mes-hall |
Ripples in a graphene membrane coupled to Glauber spins: We propose a theory of ripples in suspended graphene sheets based on
two-dimensional elasticity equations that are made discrete on the honeycomb
lattice and then periodized. At each point carbon atoms are coupled to Ising
spins whose values indicate the atoms lo... | cond-mat_mes-hall |
Electric generation of spin in crystals with reduced symmetry: We propose a simple way of evaluating the bulk spin generation of an
arbitrary crystal with a known band structure in the strong spin-orbit coupling
limit. We show that, in the presence of an electric field, there exists an
intrinsic torque term which gives... | 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 |
Energy Spectrum and Quantum Hall Effect in Twisted Bilayer Graphene: We investigate the electronic spectra and quantum Hall effect in twisted
bilayer graphenes with various rotation angles under magnetic fields, using a
model rigorously including the interlayer interaction. We describe the spectral
evolution from discr... | cond-mat_mes-hall |
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