text stringlengths 89 2.49k | category stringclasses 19
values |
|---|---|
Fluctuation electromagnetic conservative -dissipative interaction and
heating of two closely spaced parallel plates in relative motion.
Nonrelativistic approximation.1: For the first time, we calculate the heating rate, attractive conservative
and tangential dissipative fluctuation electromagnetic forces felt by a ... | cond-mat_other |
Device modeling of long-channel nanotube electro-optical emitter: We present a simple analytic model of nanotube electro-optical emitters,
along with improved experimental measurements using PMMA-passivated devices
with reduced hysteresis. Both the ambipolar electrical characteristics and the
motion of the infrared-emi... | cond-mat_other |
Chaos due to parametric excitation: phase space symmetry and photon
correlations: We discuss dissipative chaos showing symmetries in the phase space and
nonclassical statistics for a parametrically driven nonlinear Kerr resonator
(PDNR). In this system an oscillatory mode is created in the process of
degenerate down-... | cond-mat_other |
Effects of spatial and temporal noise on a cubic-autocatalytic
reaction-diffusion model: We characterize the influence that external noise, with both spatial and
temporal correlations, has on the scale dependence of the reaction parameters
of a cubic autocatalytic reaction diffusion (CARD) system. Interpreting the
CA... | cond-mat_other |
Quantum degenerate two-species Fermi-Fermi mixture coexisting with a
Bose-Einstein condensate: We report on the generation of a quantum degenerate Fermi-Fermi mixture of
two different atomic species. The quantum degenerate mixture is realized
employing sympathetic cooling of fermionic Li-6 and K-40 gases by an
evapor... | cond-mat_other |
Dipolar spinor Bose-Einstein condensates: Under many circumstances, the only important two-body interaction between
atoms in ultracold dilute atomic vapors is the short-ranged isotropic s-wave
collision. Recent studies have shown, however, that situations may arise where
the dipolar interaction between atomic magnetic ... | cond-mat_other |
Emergence of oscillons in kink-impurity interactions: The (1+1)-dimensional classical $\varphi^4$ theory contains stable,
topological excitations in the form of solitary waves or kinks, as well as
stable but non-topological solutions, such as the oscillon. Both are used in
effective descriptions of excitations througho... | cond-mat_other |
Novel Methods to Create Multielectron Bubbles in Superfluid Helium: An equilibrium multielectron bubble in liquid helium is a fascinating object
with a spherical two-dimensional electron gas on its surface. We describe two
ways of creating them. MEBs have been observed in the dome of a cylindrical
cell with an unexpect... | cond-mat_other |
Limits to the analogue Hawking temperature in a Bose-Einstein condensate: Quasi-one dimensional outflow from a dilute gas Bose-Einstein condensate
reservoir is a promising system for the creation of analogue Hawking radiation.
We use numerical modeling to show that stable sonic horizons exist in such a
system under rea... | cond-mat_other |
Two approaches for describing the Casimir interaction with graphene:
density-density correlation function versus polarization tensor: The comparison studies of theoretical approaches to the description of the
Casimir interaction in layered systems including graphene is performed. It is
shown that at zero temperature ... | cond-mat_other |
Simulations of Surface X-ray Diffraction from a Monolayer 4He Film
Adsorbed on Graphite: We carried out simulations of crystal truncation rod (CTR) scatterings, i.e.,
one of the surface X-ray diffraction techniques with atomic resolution, from a
monolayer He film adsorbed on graphite. Our simulations reveal that the ... | cond-mat_other |
Motion of vortices in ferromagnetic spin-1 BEC: The paper investigates dynamics of nonsingular vortices in a ferromagnetic
spin-1 BEC, where spin and mass superfluidity coexist in the presence of
uniaxial anisotropy (linear and quadratic Zeeman effect). The analysis is based
on hydrodynamics following from the Gross-Pi... | cond-mat_other |
Dissipation-managed soliton in a quasi-one-dimensional Bose-Einstein
condensate: We use the time-dependent mean-field Gross-Pitaevskii equation to study the
formation of a dynamically-stabilized dissipation-managed bright soliton in a
quasi-one-dimensional Bose-Einstein condensate (BEC). Because of three-body
recombi... | cond-mat_other |
Mesoscopic Aspects of Strongly Interacting Cold Atoms: Harmonically trapped lattice bosons with strong repulsive interactions
exhibit a superfluid-Mott-insulator heterostructure in the form of a "wedding
cake". We discuss the mesoscopic aspects of such a system within a
one-dimensional scattering matrix approach and ca... | cond-mat_other |
Attractive Fermi gases with unequal spin populations in highly elongated
traps: We investigate two-component attractive Fermi gases with imbalanced spin
populations in trapped one dimensional configurations. The ground state
properties are determined within local density approximation, starting from the
exact Bethe-a... | cond-mat_other |
Sufficient conditions for two-dimensional localization by arbitrarily
weak defects in periodic potentials with band gaps: We prove, via an elementary variational method, 1d and 2d localization within
the band gaps of a periodic Schrodinger operator for any mostly negative or
mostly positive defect potential, V, whose... | cond-mat_other |
Electrical Tuning of Terahertz Plasmonic Crystal Phases: We present an extensive study of resonant two-dimensional (2D) plasmon
excitations in grating-gated quantum well heterostructures, which enable an
electrical control of periodic charge carrier density profile. Our study
combines theoretical and experimental inves... | cond-mat_other |
Quantum complementarity of microcavity polaritons: We present an experiment that probes polariton quantum correlations by
exploiting quantum complementarity. Specifically, we find that polaritons in
two distinct idler-modes interfere if and only if they share the same
signal-mode so that "which-way" information cannot ... | cond-mat_other |
Quantum Phases of Ultracold Bosonic Atoms in a Two-Dimensional Optical
Superlattice: We study quantum phases of ultracold bosonic atoms in a two-dimensional
optical superlattice. The extended Bose-Hubbard model derived from the system
of ultracold bosonic atoms in an optical superlattice is solved numerically
with Gu... | cond-mat_other |
A possibility for precise Weinberg angle measurement in centrosymmetric
crystals with axis: We demonstrate that parity nonconserving interaction due to the nuclear weak
charge Q_W leads to nonlinear magnetoelectric effect in centrosymmetric
paramagnetic crystals. It is shown that the effect exists only in crystals wi... | cond-mat_other |
Charge density wave in graphene: magnetic-field-induced Peierls
instability: We suggest that a magnetic-field-induced Peierls instability accounts for the
recent experiment of Zhang et al. in which unexpected quantum Hall plateaus
were observed at high magnetic fields in graphene on a substrate. This Peierls
instabil... | cond-mat_other |
Conformal Mapping on Rough Boundaries I: Applications to harmonic
problems: The aim of this study is to analyze the properties of harmonic fields in the
vicinity of rough boundaries where either a constant potential or a zero flux
is imposed, while a constant field is prescribed at an infinite distance from
this boun... | cond-mat_other |
The Projected Gross-Pitaevskii Equation for harmonically confined Bose
gases: We extend the Projected Gross Pitaevskii equation formalism of Davis et al.
[Phys. Rev. Lett. \bf{87}, 160402 (2001)] to the experimentally relevant case
of harmonic potentials. We outline a robust and accurate numerical scheme that
can eff... | cond-mat_other |
Critical dislocation speed in helium-4 crystals: Our experiments show that in $^4$He crystals, the binding of $^3$He
impurities to dislocations does not necessarily imply their pinning. Indeed, in
these crystals, there are two different regimes of the motion of dislocations
when impurities bind to them. At lowdriving s... | cond-mat_other |
The interplay between magnetism, structure, and strong electron-phonon
coupling in binary FeAs under pressure: Unlike the ferropnictide superconductors, which crystallize in a tetragonal
crystal structure, binary FeAs forms in an orthorhombic crystal structure,
where the local atomic environment resembles a highly di... | cond-mat_other |
Simulation study of the two-dimensional Burridge-Knopoff model of
earthquakes: Spatiotemporal correlations of the two-dimensional spring-block
(Burridge-Knopoff) model of earthquakes are extensively studied by means of
numerical computer simulations. The model is found to exhibit either
``subcritical'' or ``supercrit... | cond-mat_other |
Artificial electromagnetism for neutral atoms: Escher staircase and
Laughlin liquids: We show how lasers may create fields which couple to neutral atoms in the
same way that the electromagnetic fields couple to charged particles. These
fields are needed for using neutral atoms as an analog quantum computer for
simula... | cond-mat_other |
Tracking Intrinsic Non-Hermitian Skin Effect in Lossy Lattices: Non-Hermitian skin effect (NHSE), characterized by a majority of eigenstates
localized at open boundaries, is one of the most iconic phenomena in
non-Hermitian lattices. Despite notable experimental studies implemented, most
of them witness only certain si... | cond-mat_other |
On the Transition to Turbulence of Oscillatory Flow of Liquid Helium-4: Oscillating solid bodies have frequently been used for studying the
properties of normal and superfluid helium. In particular, the transition from
laminar flow to turbulence has attracted much interest recently. The purpose of
this note is to revie... | cond-mat_other |
Limits to inertial vibration power harvesting: power-spectral-density
approach and its applications: Maximum output powers of vibration-driven inertial power harvesters reported
in literature exhibit sizable variations, even when normalized by the device
weight or their maximum linear size. To help establish a common... | cond-mat_other |
Turbulent superfluid profiles in a counterflow channel: We have developed a two-dimensional model of quantised vortices in helium II
moving under the influence of applied normal fluid and superfluid in a
counterflow channel. We predict superfluid and vortex-line density profiles
which could be experimentally tested usi... | cond-mat_other |
Genuine phase diffusion of a Bose-Einstein condensate in the
microcanonical ensemble: A classical field study: Within the classical field model, we find that the phase of a Bose-Einstein
condensate undergoes a true diffusive motion in the microcanonical ensemble,
the variance of the condensate phase change between ti... | cond-mat_other |
A simple position operator for periodic systems: We present a position operator that is compatible with periodic boundary
conditions (PBC). It is a one-body operator that can be applied in calculations
of correlated materials by simply replacing the traditional position vector by
the new definition. We show that it sat... | cond-mat_other |
Calculations of two-color interband optical injection and control of
carrier population, spin, current, and spin current in bulk semiconductors: Quantum interference between one- and two-photon absorption pathways allows
coherent control of interband transitions in unbiased bulk semiconductors;
carrier population, ca... | cond-mat_other |
The S shape of a granular pile in a rotating drum: The shape of a granular pile in a rotating drum is investigated. Using
Discrete Elements Method (DEM) simulations we show that the "S shape" obtained
for high rotation speed can be accounted for by the friction on the end plates.
A theoretical model which accounts for ... | cond-mat_other |
Landau damping: instability mechanism of superfluid Bose gases moving in
optical lattices: We investigate Landau damping of Bogoliubov excitations in a dilute Bose gas
moving in an optical lattice at finite temperatures. Using a 1D tight-binding
model, we explicitly obtain the Landau damping rate, the sign of which
d... | cond-mat_other |
The Dynamic Structure Factor of the 1D Bose Gas near the Tonks-Girardeau
Limit: While the 1D Bose gas appears to exhibit superfluid response under certain
conditions, it fails the Landau criterion according to the elementary
excitation spectrum calculated by Lieb. The apparent riddle is solved by
calculating the dyna... | cond-mat_other |
Measurements on Melting Pressure, Metastable Solid Phases, and Molar
Volume of Univariant Saturated Helium Mixture: A concentration-saturated helium mixture at the melting pressure consists of
two liquid phases and one or two solid phases. The equilibrium system is
univariant, whose properties depend uniquely on temp... | cond-mat_other |
Theoretical analysis of beta- emission from 63-Ni nano-particles in
glassy 15-P: The energy loss of $\beta^-$ emission emitting from a 63-Ni source in a
phosphorus 15-P scintillation medium is theoretically studied. It has shown the
$\beta$ energy spectrum absorption in ${15}P$ had nearly 100% efficiency for
$\leq$ 2... | cond-mat_other |
Feshbach spectroscopy of a K-Rb atomic mixture: We perform extensive magnetic Feshbach spectroscopy of an ultracold mixture
of fermionic 40K and bosonic 87Rb atoms. The magnetic-field locations of 14
interspecies resonances is used to construct a quantum collision model able to
predict accurate collisional parameters f... | cond-mat_other |
Limits to the analogue Hawking temperature in a Bose-Einstein condensate: Quasi-one dimensional outflow from a dilute gas Bose-Einstein condensate
reservoir is a promising system for the creation of analogue Hawking radiation.
We use numerical modeling to show that stable sonic horizons exist in such a
system under rea... | cond-mat_other |
Computational spectroscopy of helium-solvated molecules: effective
inertia, from small He clusters toward the nano-droplet regime: Accurate computer simulations of the rotational dynamics of linear molecules
solvated in He clusters indicate that the large-size (nano-droplet) regime is
attained quickly for light rotor... | cond-mat_other |
Strong extinction of a far-field laser beam by a single quantum dot: Through the utilization of index-matched GaAs immersion lens techniques we
demonstrate a record extinction (12%) of a far-field focused laser by a single
InAs/GaAs quantum dot. This contrast level enables us to report for the first
time resonant laser... | cond-mat_other |
Stability of the density-wave state of a dipolar condensate in a pancake
trap: We study a dipolar boson-fermion mixture in a pancake geometry at absolute
zero temperature, generalizing our previous work on the stability of polar
condensates and the formation of a density-wave state in cylindrical traps.
After examini... | cond-mat_other |
Dense electron-hole plasma in silicon light emitting diodes: Efficient electroluminescence of silicon light emitting p-n diodes with
different sizes and shapes is investigated at room temperature. High quantum
efficiency of the diodes, a long linear dependence of the electroluminescence
intensity on the diode current a... | cond-mat_other |
Feshbach resonances with large background scattering length: interplay
with open-channel resonances: Feshbach resonances are commonly described by a single-resonance Feshbach
model, and open-channel resonances are not taken into account explicitly.
However, an open-channel resonance near threshold limits the range of... | cond-mat_other |
Semi-analytic Faddeev solution to the $N$-boson problem with zero-range
interactions: We study two-body correlations for $N$ identical bosons by use of the
hyperspherical adiabatic expansion method. We use the zero-range interaction
and derive a transcendental equation determining the key ingredient of the
hyperradia... | cond-mat_other |
Vortex Lattice in a Rotating Bose-Einstein Condensate: Numerical simulations of vortex motion in a trapped Bose-Einstein condensate
were performed by solving the two-dimensional Gross-Pitaevskii equation in the
presence of a simple phenomenological model of interaction between the
condensate and the finite temperature ... | cond-mat_other |
Dipolar spinor Bose-Einstein condensates: Under many circumstances, the only important two-body interaction between
atoms in ultracold dilute atomic vapors is the short-ranged isotropic s-wave
collision. Recent studies have shown, however, that situations may arise where
the dipolar interaction between atomic magnetic ... | cond-mat_other |
The Structure of Integrable One-Dimensional Systems: We explain the relationship between the classical description of an
integrable system in terms of invariant tori and action-angle variables, and
the quantum description in terms of the asymptotic Bethe ansatz. | cond-mat_other |
Classical Region of a Trapped Bose Gas: The classical region of a Bose gas consists of all single-particle modes that
have a high average occupation and are well-described by a classical field.
Highly-occupied modes only occur in massive Bose gases at ultra-cold
temperatures, in contrast to the photon case where there ... | cond-mat_other |
Phase-controlled, heterodyne laser-induced transient grating
measurements of thermal transport properties in opaque material: The methodology for a heterodyned laser-induced transient thermal grating
technique for non-contact, non-destructive measurements of thermal transport in
opaque material is presented. Phase-co... | cond-mat_other |
Multiband superfluidity and superfluid to band-insulator transition of
strongly interacting fermions in an optical lattice: We study the multiband superfluid and the superfluid (SF) to band insulator
(BI) transition of strongly interacting fermionic atoms in an optical lattice
at a filling of two fermions per well. W... | cond-mat_other |
On the Transition from Potential Flow to Turbulence Around a Microsphere
Oscillating in Superfluid ^4He: The flow of superfluid $^4$He around a translationally oscillating sphere,
levitating without mechanical support, can either be laminar or turbulent,
depending on the velocity amplitude. Below a critical velocity ... | cond-mat_other |
Band degeneration and evolution in nonlinear triatomic chain
superlattices: Nonlinear superlattices exhibit unique features allowing for wave
manipulations. Despite the increasing attention received, the underlying
physical mechanisms and the evolution process of the band structures and
bandgaps in strongly nonlinear... | cond-mat_other |
The dynamics of condensate shells: collective modes and expansion: We explore the physics of three-dimensional shell-shaped condensates,
relevant to cold atoms in "bubble traps" and to Mott insulator-superfluid
systems in optical lattices. We study the ground state of the condensate
wavefunction, spherically-symmetric ... | cond-mat_other |
Macroscopic quantum tunneling and quantum-classical phase transitions of
the escape rate in large spin systems: This article presents a review on the theoretical and the experimental
developments on macroscopic quantum tunneling and phase transition of the
escape rate in spin systems. We present the basic ideas with ... | cond-mat_other |
Solid-liquid phase coexistence and structural transitions in palladium
clusters: We use molecular dynamics with an embedded atom potential to study the
behavior of palladium nanoclusters near the melting point in the microcanonical
ensemble. We see transitions from both fcc and decahedral ground state
structures to i... | cond-mat_other |
Superslow Self-Organized Motions in a Multimode Microwave Phonon Laser
(Phaser) under Resonant Destabilization of Stationary Acoustic Stimulated
Emission: Two qualitatively different kinds of resonant destabilization of phonon
stimulated emission (SE) are experimentally revealed for periodically forced
multimode ru... | cond-mat_other |
Wavelet versus Detrended Fluctuation Analysis of multifractal structures: We perform a comparative study of applicability of the Multifractal Detrended
Fluctuation Analysis (MFDFA) and the Wavelet Transform Modulus Maxima (WTMM)
method in proper detecting of mono- and multifractal character of data. We
quantify the per... | cond-mat_other |
Temperature dependence of exciton recombination in semiconducting
single-wall carbon nanotubes: We study the excitonic recombination dynamics in an ensemble of (9,4)
semiconducting single-wall carbon nanotubes by high sensitivity time-resolved
photo-luminescence experiments. Measurements from cryogenic to room temper... | cond-mat_other |
Fermion Superfluids of Non-Zero Orbital Angular Momentum near Resonance: We study the pairing of Fermi gases near the scattering resonance of the
$\ell\neq 0$ partial wave. Using a model potential which reproduces the actual
two-body low energy scattering amplitude, we have obtained an analytic solution
of the gap equa... | cond-mat_other |
Boson-Fermion pairing in Bose-Fermi mixtures on 1D optical lattices: Boson-fermion pairing is considered in a discrete environment of bosons and
fully spin-polarized fermions, coupled via an attractive Bose-Fermi Hubbard
Hamiltonian in one dimension. The results of the T-matrix approximation for
particles of equal mass... | cond-mat_other |
Matrix Product Density Operators: Simulation of finite-T and dissipative
systems: We show how to simulate numerically both the evolution of 1D quantum systems
under dissipation as well as in thermal equilibrium. The method applies to both
finite and inhomogeneous systems and it is based on two ideas: (a) a
representa... | cond-mat_other |
Fully Frustrated Cold Atoms: Fully frustrated Josephson Junction arrays (FF-JJA's) exhibit a subtle
compound phase transition in which an Ising transition associated with discrete
broken translational symmetry and a Berezinskii-Kosterlitz-Thouless (BKT)
transition associated with quasi-long-range phase coherence occur ... | cond-mat_other |
Generalized Mean Field Approach to a Resonant Bose-Fermi Mixture: We formulate a generalized mean-field theory of a mixture of fermionic and
bosonic atoms, in which the fermion-boson interaction can be controlled by a
Feshbach resonance. The theory correctly accounts for molecular binding
energies of the molecules in t... | cond-mat_other |
Controlling a magnetic Feshbach resonance with laser light: The capability to tune the strength of the elastic interparticle interaction
is crucial for many experiments with ultracold gases. Magnetic Feshbach
resonances are a tool widely used for this purpose, but future experiments
would benefit from additional flexib... | cond-mat_other |
Search for supersolid 4He in neutron scattering experiments at ISIS: The observation of a non-classical rotation inertia (NCRI) fraction in bulk
solid 4He by M. Chan and E. Kim attracted significant interest as a possible
manifestation of supersolid state of matter. Despite numerous experimental and
theoretical studies... | cond-mat_other |
Using Multi-Threshold Threshold Gates in RTD-based Logic Design. A Case
Study: The basic building blocks for Resonant Tunnelling Diode (RTD) logic circuits
are Threshold Gates (TGs) instead of the conventional Boolean gates (AND, OR,
NAND, NOR) due to the fact that, when designing with RTDs, threshold gates can
be im... | cond-mat_other |
Experimental investigation on the microscopic structure of intrinsic
paramagnetic point defects in amorphous silicon dioxide: In the present Ph.D. Thesis we report an experimental investigation on the
effects of gamma- and beta-ray irradiation and of subsequent thermal treatment
on many types of a-SiO2 materials, dif... | cond-mat_other |
Collision Dynamics and Rung Formation of Non-Abelian Vortices: We investigate the collision dynamics of two non-Abelian vortices and find
that, unlike Abelian vortices, they neither reconnect themselves nor pass
through each other, but create a rung between them in a topologically stable
manner. Our predictions are ver... | cond-mat_other |
Generalized gradient approximation for solids and their surfaces: Successful modern generalized gradient approximations (GGA) are biased toward
atomic energies. Restoration of the first-principles gradient expansion for the
exchange energy over a wide range of density gradients eliminates this bias. We
introduce PBEsol... | cond-mat_other |
Mode-locking and mode-competition in a non-equilibrium solid-state
condensate: A trapped polariton condensate with continuous pumping and decay is analyzed
using a generalized Gross-Pitaevskii model. Whereas an equilibrium condensate
is characterized by a macroscopic occupation of a ground state, here the
steady-stat... | cond-mat_other |
Influence of domain wall interactions on nanosecond switching in
magnetic tunnel junctions: We have obtained microscopic evidence of the influence of domain wall stray
fields on the nanosecond magnetization switching in magnetic trilayer systems.
The nucleation barrier initiating the magnetic switching of the soft ma... | cond-mat_other |
Inversion of the spin polarization of localized electrons driven by dark
excitons: The creation of free excitons by absorption of circularly polarized photons,
and their subsequent fast capture by donors, is at the origin of the spin
polarization of donor-bound electrons. The sign of the electronic spin
polarization ... | cond-mat_other |
Non-periodic pseudo-random numbers used in Monte Carlo calculations: The generation of pseudo-random numbers is one of the interesting problems in
Monte Carlo simulations, mostly because the common computer generators produce
periodic numbers. We used simple pseudo-random numbers generated with the
simplest chaotic sys... | cond-mat_other |
Excitation spectrum of bosons in a finite one-dimensional circular
waveguide via the Bethe ansatz: The exactly solvable Lieb-Liniger model of interacting bosons in
one-dimension has attracted renewed interest as current experiments with
ultra-cold atoms begin to probe this regime. Here we numerically solve the
equati... | cond-mat_other |
On the feasibility of studying vortex noise in 2D superconductors with
cold atoms: We investigate the feasibility of using ultracold neutral atoms trapped near
a thin superconductor to study vortex noise close to the
Kosterlitz-Thouless-Berezinskii transition temperature. Alkali atoms such as
rubidium probe the magne... | cond-mat_other |
Anomalous enhancement of quasiparticle current near a potential barrier
in a Bose-Einstein condensate: We investigate tunneling properties of Bogoliubov phonons in a Bose-Einstein
condensate. We find the anomalous enhancement of the quasiparticle current
$J_{\rm q}$ carried by Bogoliubov phonons near a potential barr... | cond-mat_other |
Effects of Community Structure on Search and Ranking in Information
Network: The World-Wide Web (WWW) is characterized by a strong community structure in
which communities of webpages (e.g. those sharing a common keyword) are densely
interconnected by hyperlinks. We study how such network architecture affects
the ave... | cond-mat_other |
Feshbach resonances in an ultracold $^7$Li and $^{87}$Rb mixture: We report on the observation of five Feshbach resonances in collisions
between ultracold $^7$Li and $^{87}$Rb atoms in the absolute ground state
mixture where both species are in their $|f,m_f>=|1,1>$ hyperfine states. The
resonances appear as trap losse... | cond-mat_other |
Accurate measurement of ^{13}C - ^{15}N distances with solid-state NMR: Solid-state NMR technique for measureing distances between hetero-nuclei in
static powder samples is described. It is based on a two-dimensional
single-echo scheme enhanced with adiabatic cross-polarization. As an example,
the results for intra-mol... | cond-mat_other |
Theory of ground states for classical Heisenberg spin systems IV: We extend the theory of ground states of classical Heisenberg spin systems
previously published to the case where the interaction with an external
magnetic field is described by a Zeeman term. The ground state problem for the
Heisenberg-Zeeman Hamiltonia... | cond-mat_other |
Macroscopic quantum tunnelling of Bose-Einstein condensates in a finite
potential well: Bose-Einstein condensates are studied in a potential of finite depth which
supports both bound and quasi-bound states. This potential, which is harmonic
for small radii and decays as a Gaussian for large radii, models experimental... | cond-mat_other |
Thomas-Fermi versus one- and two-dimensional regimes of a trapped
dipolar Bose-Einstein condensate: We derive the criteria for the Thomas-Fermi regime of a dipolar Bose-Einstein
condensate in cigar, pancake and spherical geometries. This also naturally
gives the criteria for the mean-field one- and two-dimensional re... | cond-mat_other |
Controlled quantum stirring of Bose-Einstein condensates: By cyclic adiabatic change of two control parameters of an optical trap one
can induce a circulating current of condensed bosons. The amount of particles
that are transported per period depends on the "radius" of the cycle, and this
dependence can be utilized in... | cond-mat_other |
An exploration of thermal counterflow in He II using particle tracking
velocimetry: Visualization of thermal counterflow in He II using PIV (particle image
velocimetry) and PTV (particle tracking velocimetry) is difficult because
tracer particle motion can be influenced by both the normal fluid and
superfluid compone... | cond-mat_other |
Exact Coulomb cutoff technique for supercell calculations in two
dimensions: We present a reciprocal space technique for the calculation of the Coulomb
integral in two dimensions in systems with reduced periodicity, i.e., finite
systems, or systems that are periodic only in one dimension. The technique
consists in cu... | cond-mat_other |
Photoconduction in Alq3: Photoelectronic properties of Alq3 were studied by photoconductivity
measurements in thin film, sandwich (ITO/Alq3/LiF/Al) devices. We find that the
photocurrent is dominated by bulk generation of carriers for incident photon
energies greater than 2.75 eV. The quantum efficiency of photocarrier... | cond-mat_other |
Emergent Time Scale in Entangled Quantum Dynamics of Ultracold Molecules
in Optical Lattices: We derive a novel lattice Hamiltonian, the \emph{Molecular Hubbard
Hamiltonian} (MHH), which describes the essential many body physics of
closed-shell ultracold heteronuclear molecules in their absolute ground state
in a qua... | cond-mat_other |
Disorder, defects and bandgaps in ultra thin (001) MgO tunnel barrier
layers: We report scanning tunneling spectroscopy studies of the electronic structure
of 1.5 to 3 nm (001) textured MgO layers grown on (001) Fe. Thick MgO layers
exhibit a bulk-like band gap, approximately 5-7 eV, and sparse, localized
defect stat... | cond-mat_other |
Electrical spin injection into p-doped quantum dots through a tunnel
barrier: We have demonstrated by electroluminescence the injection of spin polarized
electrons through Co/Al2O3/GaAs tunnel barrier into p-doped InAs/GaAs quantum
dots embedded in a PIN GaAs light emitting diode. The spin relaxation processes
in the... | cond-mat_other |
Viscoelastic Behavior of Solid $^4$He: Over the last five years several experimental groups have reported anomalies
in the temperature dependence of the period and amplitude of a torsional
oscillator containing solid $^4$He. We model these experiments by assuming that
$^4$He is a viscoelastic solid--a solid with freque... | cond-mat_other |
Conservative-dissipative forces and heating mediated by fluctuation
electromagnetic field: two plates in relative nonrelativistic motion: We calculate heating rate, attractive conservative and tangential dissipative
fluctuation electromagnetic forces felt by a thick plate moving with
nonrelativistic velocity parallel... | cond-mat_other |
Wealth distribution in an ancient Egyptian society: Modern excavations yielded a distribution of the house areas in the ancient
Egyptian city Akhetaten, which was populated for a short period during the 14th
century BC. Assuming that the house area is a measure of the wealth of its
inhabitants allows us to make a compa... | cond-mat_other |
Basic theory tools for degenerate Fermi gases: This is an introductory lecture to the theory of degenerate Fermi gases, in
the context of present experiments on atomic Fermi gases. In part one, some
properties of the ideal Fermi gas are presented, including a discussion of the
fluctuations of the number of fermions in ... | cond-mat_other |
The surface-forming energy release rate based fracture criterion for
elastic-plastic crack propagation: J integral based criterion is widely used in elastic-plastic fracture
mechanics. However, it is not rigorously applicable when plastic unloading
appears during crack propagation. One difficulty is that the energy d... | cond-mat_other |
Discrete symmetry in graphene: the Dirac equation and beyond: In this pedagogical paper we review the discrete symmetries of the Dirac
equation using elementary tools, but in a comparative order: the usual 3 + 1
dimensional case and the 2 + 1 dimensional case. Motivated by new applications
of the 2d Dirac equation in c... | cond-mat_other |
Collective Excitations of a Two-Component Bose Condensate at Finite
Temperature: We compare the collective modes for Bose-condensed systems with two
degenerate components with and without spontaneous intercomponent coherence at
finite temperature using the time-dependent Hartree-Fock approximation. We show
that the i... | cond-mat_other |
Material independent crack arrest statistics: The propagation of (planar) cracks in a heterogeneous brittle material
characterized by a random field of toughness is considered, taking into account
explicitly the effect of the crack front roughness on the local stress
intensity factor. In the so-called strong-pinning re... | cond-mat_other |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.