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Collective Excitations of Bose-Einstein Condensates in a Double-Well
Potential: We investigate collective excitations of Bose-Einstein condensates at
absolute zero in a double-well trap. We solve the Bogoliubov equations with a
double-well trap, and show that the crossover from the dipole mode to the
Josephson plasma... | cond-mat_other |
Hydrodynamic theory of transport in doped graphene: We study non-linear dc transport in graphene using a hydrodynamic approach
and conclude that in clean samples the drift velocity saturates at a weakly
density-dependent value v_{sat} ~ 10^7 cm/s. We show that saturation results
from the interactions between graphene's... | cond-mat_other |
Axicon Lens for Coherent Matter Waves: We have realized a conical matter wave lens. The repulsive potential of a
focused laser beam was used to launch a Bose-Einstein condensate into a
radially expanding wavepacket whose perfect ring shape was ensured by energy
conservation. In spite of significant interactions between... | cond-mat_other |
Analytical solution of the equation of motion for a rigid domain wall in
a magnetic material with perpendicular anisotropy: This paper reports the solution of the equation of motion for a domain wall
in a magnetic material which exhibits high magneto-crystalline anisotropy.
Starting from the Landau-Lifschitz-Gilbert ... | cond-mat_other |
Giant planar Hall effect in colossal magnetoresistive
La(0.84)Sr(0.16)MnO(3) thin films: The transverse resistivity in thin films of La(0.84)Sr(0.16)MnO(3)
(LSMO)exhibits sharp field-symmetric jumps below Tc. We show that a likely
source of this behavior is the giant planar Hall effect (GPHE) combined with
biaxial ma... | cond-mat_other |
Coherent backscattering of Bose-Einstein condensates in two-dimensional
disorder potentials: We study quantum transport of an interacting Bose-Einstein condensate in a
two-dimensional disorder potential. In the limit of vanishing atom-atom
interaction, a sharp cone in the angle-resolved density of the scattered matte... | cond-mat_other |
Long-lived Feshbach molecules in a 3D optical lattice: We have created and trapped a pure sample of 87Rb2 Feshbach molecules in a
three-dimensional optical lattice. Compared to previous experiments without a
lattice we find dramatic improvements such as long lifetimes of up to 700 ms
and a near unit efficiency for conv... | cond-mat_other |
Auger mediated quantum sticking of positrons to surfaces: Evidence for
single step transition from a scattering state to a surface image potential
bound state: We present the observation of an efficient mechanism for positron sticking to
surfaces termed here Auger mediated quantum sticking. In this process the
ener... | cond-mat_other |
Expansions of the interatomic potential for different boundary
conditions and the transition to the thermodynamic limit: We analyze the possible expansions of the interatomic potential
$U(|\textbf{r}_{1}-\textbf{r}_{2}|)$ in a Fourier series for a cyclic system
and a system with boundaries. We also study the transiti... | cond-mat_other |
Improvements in 3D Automated Shimming Techniques in High-Resolution NMR: Traditionally the improvement of static magnetic field homogeneity of the
magnet in Nuclear Magnetic Resonance (NMR) spectroscopy is performed manually,
which has many limitations. However, in recent years a number of automated
shimming techniques... | cond-mat_other |
Semiconductor-metal nanoparticle molecules: hybrid excitons and
non-linear Fano effect: Modern nanotechnology opens the possibility of combining nanocrystals of
various materials with very different characteristics in one superstructure.
The resultant superstructure may provide new physical properties not
encountered... | cond-mat_other |
Observation of deviations from ideal gas thermodynamics in a trapped
Bose-Einstein condensed gas: We have investigated experimentally the finite-temperature properties of a
Bose-Einstein condensed cloud of $^{87}$Rb atoms in a harmonic trap. Focusing
primarily on condensed fraction and expansion energy, we measure un... | cond-mat_other |
Transport of Atom Packets in a Train of Ioffe-Pritchard Traps: We demonstrate transport and evaporative cooling of several atomic clouds in
a chain of magnetic Ioffe-Pritchard traps moving at a low speed ($<1$~m/s). The
trapping scheme relies on the use of a magnetic guide for transverse
confinement and of magnets fixe... | cond-mat_other |
Superfluid Bose-Fermi mixture from weak-coupling to unitarity: We investigate the zero-temperature properties of a superfluid Bose-Fermi
mixture by introducing a set of coupled Galilei-invariant nonlinear
Schr\"odinger equations valid from weak-coupling to unitarity. The Bose
dynamics is described by a Gross-Pitaevskii... | cond-mat_other |
Dynamics of localized spins coupled to the conduction electrons with
charge/spin currents: The effects of the charge/spin currents of conduction electrons on the
dynamics of the localized spins are studied in terms of the perturbation in the
exchange coupling $J_{K}$ between them. The equations of motion for the
loca... | cond-mat_other |
Radio-frequency operation of a double-island single-electron transistor: We present results on a double-island single-electron transistor (DISET)
operated at radio-frequency (rf) for fast and highly sensitive detection of
charge motion in the solid state. Using an intuitive definition for the charge
sensitivity, we com... | cond-mat_other |
Exciton and biexciton energies in bilayer systems: We report calculations of the energies of excitons and biexcitons in ideal
two-dimensional bilayer systems within the effective-mass approximation with
isotropic electron and hole masses. The exciton energies are obtained by a
simple numerical integration technique, wh... | 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 |
Faraday waves in Bose-Einstein condensates: Motivated by recent experiments on Faraday waves in Bose-Einstein condensates
we investigate both analytically and numerically the dynamics of cigar-shaped
Bose-condensed gases subject to periodic modulation of the strength of the
transverse confinement. We offer a fully anal... | cond-mat_other |
Structural phase transitions in epitaxial perovskite films: Three different film systems have been systematically investigated to
understand the effects of strain and substrate constraint on the phase
transitions of perovskite films. In SrTiO$_3$ films, the phase transition
temperature T$_C$ was determined by monitorin... | cond-mat_other |
Theory of magnon-polaritons in quantum Ising materials: We present a theory of magnon-polaritons in quantum Ising materials, and
develop a formalism describing the coupling between light and matter as an
Ising system is tuned through its quantum critical point. The theory is applied
to Ising materials having multilevel... | cond-mat_other |
Photoluminescence Spectroscopy of the Molecular Biexciton in Vertically
Stacked Quantum Dot Pairs: We present photoluminescence studies of the molecular neutral
biexciton-exciton spectra of individual vertically stacked InAs/GaAs quantum
dot pairs. We tune either the hole or the electron levels of the two dots into
t... | cond-mat_other |
Interference of spin states in photoemission from Sb/Ag(111): Using a three-dimensional spin polarimeter we have gathered evidence for the
interference of spin states in photoemission from the surface alloy Sb/Ag(111).
This system features a small Rashba-type spin-splitting of a size comparable to
the linewidth of the ... | cond-mat_other |
Non-radiative exciton energy transfer in hybrid organic-inorganic
heterostructures: Non-radiative optical energy transfer from a GaAs quantum well to a thin
overlayer of an infrared organic semiconductor dye is unambiguously
demonstrated. The dynamics of exciton transfer are studied in the time-domain
using pump-prob... | cond-mat_other |
Light scattering in Cooper-paired Fermi atoms: We present a detailed theoretical study of light scattering off superfluid
trapped Fermi gas of atoms at zero temperature. We apply Nambu-Gorkov formalism
of superconductivity to calculate the response function of superfluid gas due
to stimulated light scattering taking in... | cond-mat_other |
Epitaxial self-organization: from surfaces to magnetic materials: Self-organization of magnetic materials is an emerging and active field. An
overview of the use of self-organization for magnetic purposes is given, with a
view to illustrate aspects that cannot be covered by lithography. A first set
of issues concerns t... | cond-mat_other |
Characterization of the Shell Structure in Coupled Quantum Dots through
Resonant Optical Probing: Excited states in single quantum dots (QDs) have been shown to be useful for
spin state initialization and manipulation. For scalable quantum information
processing it is necessary to have multiple spins interacting. The... | cond-mat_other |
Drift mobility of long-living excitons in coupled GaAs quantum wells: We observe high-mobility transport of indirect excitons in coupled GaAs
quantum wells. A voltage-tunable in-plane potential gradient is defined for
excitons by exploiting the quantum confined Stark effect in combination with a
lithographically design... | cond-mat_other |
The two-site Bose--Hubbard model: The two-site Bose--Hubbard model is a simple model used to study Josephson
tunneling between two Bose--Einstein condensates. In this work we give an
overview of some mathematical aspects of this model. Using a classical
analysis, we study the equations of motion and the level curves of... | cond-mat_other |
Suppressing the Kibble-Zurek mechanism by a symmetry-violating bias: The formation of topological defects in continuous phase transitions is
driven by the Kibble-Zurek mechanism. Here we study the formation of single-
and half-quantum vortices during transition to the polar phase of $^3$He in the
presence of a symmetry... | cond-mat_other |
Electromagnetic properties of graphene junctions: A resonant chiral tunneling (CT) across a graphene junction (GJ) induced by
an external electromagnetic field (EF) is studied. Modulation of the electron
and hole wavefunction phases $\varphi$ by the external EF during the CT
processes strongly impacts the CT directiona... | cond-mat_other |
Effective field theory for He-IV: We introduce an effective scalar field theory to describe the He-IV phase
diagram, which can be considered as a generalization of the XY model which
gives the usual lambda-transition. This theory results from a Ginzburg-Landau
Hamiltonian with higher order derivatives, which allow to p... | cond-mat_other |
Polarisation rotation of slow light with orbital angular momentum in
ultracold atomic gases: We consider the propagation of slow light with an orbital angular momentum
(OAM) in a moving atomic medium. We have derived a general equation of motion
and applied it in analysing propagation of slow light with an OAM in a r... | cond-mat_other |
Piezo-Magneto-Electric Effects in p-Doped Semiconductors: We predict the appearance of a uniform magnetization in strained three
dimensional p-doped semiconductors with inversion symmetry breaking subject to
an external electric field. We compute the magnetization response to the
electric field as a function of the dir... | cond-mat_other |
Radiative annihilation of a soliton and an antisoliton in the coupled
sine-Gordon equation: In the sine-Gordon equation solitons and antisolitons in the absence of
perturbations do not annihilate. Here I present numerical analysis of
soliton-antisoliton collisions in the coupled sine-Gordon equation. It is shown
that... | cond-mat_other |
Scattering of surface plasmon polaritons by one-dimensional
inhomogeneities: The scattering of surface plasmons polaritons by a one-dimensional defect of
the surface is theoretically studied, by means of both Rayleigh and modal
expansions. The considered defects are either relief perturbations or
variations in the pe... | cond-mat_other |
Pseudo-potential of a power-law decaying interaction in two-dimensional
systems: We analytically derive the general pseudo-potential operator of an arbitrary
isotropic interaction for particles confined in two-dimensional (2D) systems,
using the frame work developed by Huang and Yang for 3D scattering. We also
analyt... | cond-mat_other |
Stochastic Dynamical Structure (SDS) of Nonequilibrium Processes in the
Absence of Detailed Balance. IV: Emerging of Stochastic Dynamical Equalities
and Steady State Thermodynamics from Darwinian Dynamics: This is the fourth paper, the last one, on solution to the problem of absence
of detailed balance in nonequili... | cond-mat_other |
Two-particle binding energy of interacting Bose gases: The pole of the two-particle T-matrix including the influence of the
surrounding medium is analyzed for an interacting Bose gas. The phase diagram
of the Bose -Einstein condensation (BEC) depending on the temperature, density,
scattering length, and momentum is der... | cond-mat_other |
Hard Core Bosons on the Triangular Lattice at Zero Temperature: A Series
Expansion Study: We use high order linked cluster series to investigate the hard core boson
model on the triangular lattice, at zero temperature. Our expansions, in powers
of the hopping parameter $t$, probe the spatially ordered `solid' phase a... | cond-mat_other |
Electron-spin beat susceptibility of excitons in semiconductor quantum
wells: Recent time-resolved differential transmission and Faraday rotation
measurements of long-lived electron spin coherence in quantum wells displayed
intriguing parametric dependencies. For their understanding we formulate a
microscopic theory ... | cond-mat_other |
On the Energy-Based Variational Model for Vector Magnetic Hysteresis: We consider the quasi-static magnetic hysteresis model based on a
dry-friction like representation of magnetization. The model has a consistent
energy interpretation, is intrinsically vectorial, and ensures a direct
calculation of the stored and diss... | cond-mat_other |
Energy flow of moving dissipative topological solitons: We study the energy flow due to the motion of topological solitons in
nonlinear extended systems in the presence of damping and driving. The total
field momentum contribution to the energy flux, which reduces the soliton
motion to that of a point particle, is insu... | cond-mat_other |
Nucleation at quantized vortices and the heterogeneous phase separation
in supersaturated superfluid 3He-4He liquid mixtures: Supersaturated superfluid 3He-4He liquid mixture, separating into the
3He-concentrated c-phase and 3He-diluted d-phase, represents a unique
possibility for studying macroscopic quantum nucleat... | cond-mat_other |
Logarithmic velocity profile of quantum turbulence of superfluid $^4$He: The logarithmic velocity profile is the most important statistical law of
classical turbulence affected by channel walls. This paper demonstrates
numerically that the logarithmic velocity profile of a superfluid flow appears
in quantum turbulence ... | cond-mat_other |
Rayleigh-Taylor instability of crystallization waves at the
superfluid-solid 4He interface: At the superfluid-solid 4He interface there exist crystallization waves
having much in common with gravitational-capillary waves at the interface
between two normal fluids. The Rayleigh-Taylor instability is an instability of
... | cond-mat_other |
Tunneling and Resonant Conductance in One-Dimensional Molecular
Structures: We present a theory of tunneling and resonant transitions in one-dimensional
molecular systems which is based on Green's function theory of electron
sub-barrier scattering off the structural units (or functional groups) of a
molecular chain. ... | cond-mat_other |
Electronic Structure and Dynamics of Quantum-Well States in thin
Yb-Metal Films: Quantum-well states above the Fermi energy in thin Yb(111)-metal films
deposited on a W(110) single crystal were studied by low-temperature scanning
tunneling spectroscopy. These states are laterally highly localized and give
rise to sha... | cond-mat_other |
Crystal truncation rods in kinematical and dynamical x-ray diffraction
theories: Crystal truncation rods calculated in the kinematical approximation are shown
to quantitatively agree with the sum of the diffracted waves obtained in the
two-beam dynamical calculations for different reflections along the rod. The
choic... | cond-mat_other |
Structure and magnetic properties of the Ho2Ge2O7 pyrogermanate: We report the anisotropic magnetic properties of Ho2Ge2O7 determined from dc
and ac magnetization, specific heat and powder neutron diffraction experiments.
The magnetic lanthanide sublattice, seen in our refinement of the tetragonal
pyrogermanate crystal... | cond-mat_other |
Bragg spectroscopy of a strongly interacting Fermi gas: We present a comprehensive study of the Bose-Einstein condensate to
Bardeen-Cooper-Schrieffer (BEC-BCS) crossover in fermionic $^6$Li using Bragg
spectroscopy. A smooth transition from molecular to atomic spectra is observed
with a clear signature of pairing at an... | cond-mat_other |
Critical temperature of a trapped Bose gas: comparison of theory and
experiment: We apply the Projected Gross-Pitaevskii equation (PGPE) formalism to the
experimental problem of the shift in critical temperature $T_c$ of a
harmonically confined Bose gas as reported in Gerbier \emph{et al.} [Phys. Rev.
Lett. \textbf{9... | cond-mat_other |
Entanglement between particle partitions in itinerant many-particle
states: We review `particle partitioning entanglement' for itinerant many-particle
systems. This is defined as the entanglement between two subsets of particles
making up the system. We identify generic features and mechanisms of particle
entanglemen... | cond-mat_other |
Interference of a variable number of coherent atomic sources: We have studied the interference of a variable number of independently
created $m_F=0$ microcondensates in a CO$_{2}$-laser optical lattice. The
observed average interference contrast decreases with condensate number N. Our
experimental results agree well wi... | cond-mat_other |
Synchronized and Desynchronized Phases of Exciton-Polariton Condensates
in the Presence of Disorder: Condensation of exciton-polaritons in semiconductor microcavities takes place
despite in plane disorder. Below the critical density the inhomogeneity of the
potential seen by the polaritons strongly limits the spatial... | cond-mat_other |
Observation of Mass Transport through Solid 4He: By use of a novel experimental design, one that provides for superfluid
helium in contact with bulk hcp 4He off the melting curve, we have observed the
DC transport of mass through a cell filled with solid 4He in the hcp region of
the phase diagram. Flow, which shows cha... | cond-mat_other |
Spin Transfer Switching and Spin Polarization in Magnetic Tunnel
Junctions with Mgo and Alox Barriers: We present spin transfer switching results for MgO based magnetic tunneling
junctions (MTJs)with large tunneling magnetoresistance (TMR) ratio of up to
150% and low intrinsic switching current density of 2-3 x 10 MA... | cond-mat_other |
Rotational Analog of the Hall Effect: Coriolis Contribution to Electric
Current: A galvanogyroscopic effect which is the rotational analog of the
gravitomagnetic Hall effect has been proposed. As a consequence of Ohm's law in
the rotating frame, the effect of the Coriolis force on the conduction current
is predicted ... | cond-mat_other |
Phase diagrams of the Bose-Hubbard model at finite temperature: The phase transitions in the Bose-Hubbard model are investigated. A
single-particle Green's function is calculated in the random phase
approximation and the formalism of the Hubbard operators is used. The regions
of existence of the superfluid and Mott ins... | cond-mat_other |
Charge qubit entanglement in double quantum dots: We study entanglement of charge qubits in a vertical tunnel-coupled double
quantum dot containing two interacting electrons. Exact diagonalization is used
to compute the negativity characterizing entanglement. We find that
entanglement can be efficiently generated and c... | cond-mat_other |
Unusual magnetic behavior in ferrite hollow nanospheres: We report unusual magnetic behavior in iron oxide hollow nanospheres of 9.3
$nm$ in diameter. The large fraction of atoms existing at the inner and outer
surfaces gives rise to a high magnetic disorder. The overall magnetic behavior
can be explained considering t... | cond-mat_other |
Dynamics of the quantum Duffing oscillator in the driving induced
bistable regime: We investigate the nonlinear response of an anharmonic monostable quantum
mechanical resonator to strong external periodic driving. The driving thereby
induces an effective bistability in which resonant tunneling can be identified.
Wit... | cond-mat_other |
Precision measurement of spin-dependent interaction strengths for spin-1
and spin-2 87Rb atoms: We report on precision measurements of spin-dependent interaction-strengths
in the 87Rb spin-1 and spin-2 hyperfine ground states. Our method is based on
the recent observation of coherence in the collisionally driven spin... | cond-mat_other |
Plasma mechanisms of resonant terahertz detection in two-dimensional
electron channel with split gates: We analyze the operation of a resonant detector of terahertz (THz) radiation
based on a two-dimensional electron gas (2DEG) channel with split gates. The
side gates are used for the excitation of plasma oscillation... | cond-mat_other |
Kramers-Kronig constrained variational analysis of optical spectra: A universal method of extraction of the complex dielectric function
$\epsilon(\omega)=\epsilon_{1}(\omega)+i\epsilon_{2}(\omega)$ from
experimentally accessible optical quantities is developed. The central idea is
that $\epsilon_{2}(\omega)$ is paramet... | cond-mat_other |
Quantum confinement corrections to the capacitance of gated
one-dimensional nanostructures: With the help of a multi-configurational Green's function approach we
simulate single-electron Coulomb charging effects in gated ultimately scaled
nanostructures which are beyond the scope of a selfconsistent mean-field
descri... | cond-mat_other |
Comment on "Magnetic quantum oscillations of the conductivity in layered
conductors": We discuss the recent theory of Gvozdikov [Phys. Rev. B 70, 085113 (2004)]
which aims at explaining the Shubnikov-de Haas oscillations of the longitudinal
resistivity \rho_zz observed in the quasi-two-dimensional organic compound
\b... | cond-mat_other |
Derivation of phenomenological expressions for transition matrix
elements for electron-phonon scattering: In the literature on electron-phonon scatterings very often a
phenomenological expression for the transition matrix element is used which was
derived in the textbooks of Ashcroft/Mermin and of Czycholl. There are... | cond-mat_other |
Dislocation Mobility and Anomalous Shear Modulus Effect in $^4$He
Crystals: We calculate the dislocation glide mobility in solid $^4$He within a model
that assumes the existence of a superfluid field associated with dislocation
lines. Prompted by the results of this mobility calculation, we study within
this model th... | cond-mat_other |
Structural phase transitions in epitaxial perovskite films: Three different film systems have been systematically investigated to
understand the effects of strain and substrate constraint on the phase
transitions of perovskite films. In SrTiO$_3$ films, the phase transition
temperature T$_C$ was determined by monitorin... | cond-mat_other |
Magnetic monopoles in a charged two-condensate Bose-Einstein system: We propose that a charged two-condensate Bose system possesses point-like
topological defects which can be interpreted as magnetic monopoles. By making
use of the $\phi$-mapping theory, the topological charges of these magnetic
monopoles can be expres... | cond-mat_other |
Dynamical Exchange Interaction From Time-Dependent Spin Density
Functional Theory: We report on {\it ab initio} time-dependent spin dynamics simulations for a
two-center magnetic molecular complex based on time-dependent non-collinear
spin density functional theory. In particular, we discuss how the dynamical
behavio... | cond-mat_other |
Influence of s-d scattering on the electron density of states in
ferromagnet/superconductor bilayer: We study the dependence of the electronic density of states (DOS) on the
distance from the boundary for a ferromagnet/superconductor bilayer. We
calculate the electron density of states in such structure taking into a... | cond-mat_other |
Entanglement area law in superfluid $^4$He: Area laws were first discovered by Bekenstein and Hawking, who found that the
entropy of a black hole grows proportional to its surface area, and not its
volume. Entropy area laws have since become a fundamental part of modern
physics, from the holographic principle in quantu... | cond-mat_other |
Ground and excited-state fermions in a 1D double-well, exact and
time-dependent density-functional solutions: Two of the most popular quantum mechanical models of interacting fermions are
compared to each other and to potentially exact solutions for a pair of
contact-interacting fermions trapped in a 1D double-well p... | cond-mat_other |
Predicting scattering properties of ultracold atoms: adiabatic
accumulated phase method and mass scaling: Ultracold atoms are increasingly used for high precision experiments that can
be utilized to extract accurate scattering properties. This calls for a
stronger need to improve on the accuracy of interatomic potent... | cond-mat_other |
Optimal design of fast topological pumping: Utilizing synthetic dimensions generated by spatial or temporal modulation,
topological pumping enables the exploration of higher-dimensional topological
phenomena through lower-dimensional physical systems. In this letter, we
propose a rational design paradigm of fast topolo... | cond-mat_other |
Mapping Approach for Quantum-Classical Time Correlation Functions: The calculation of quantum canonical time correlation functions is considered
in this paper. Transport properties, such as diffusion and reaction rate
coefficients, can be determined from time integrals of these correlation
functions. Approximate, quant... | cond-mat_other |
Threshold behavior of bosonic two-dimensional few-body systems: Bosonic two-dimensional self-bound clusters consisting of $N$ atoms
interacting through additive van der Waals potentials become unbound at a
critical mass m*(N); m*(N) has been predicted to be independent of the size of
the system. Furthermore, it has bee... | cond-mat_other |
An Advice about Shimming in High-Resolution Nuclear Magnetic Resonance: Three methods of active shimming in high-resolution NMR in existence (manual
shimming, lock optimization and gradient shimming) are briefly discussed and
their advantages and shortcomings are compared and also an advice on their use
is given. | cond-mat_other |
Atom-to-molecule conversion efficiency and adiabatic fidelity: The efficiency of converting two-species fermionic atoms into bosonic
molecules is investigated in terms of mean-field Lagrangian density. We find
that the STIRAP technique aided by Feshbach resonance is more effective than
the bare Fechbach resonance for $... | cond-mat_other |
Exact BCS stochastic schemes for a time dependent many-body fermionic
system: The exact quantum state evolution of a fermionic gas with binary interactions
is obtained as the stochastic average of BCS-state trajectories. We find the
most general Ito stochastic equations which reproduce exactly the dynamics of
the sys... | cond-mat_other |
Pairing mean-field theory for the dynamics of dissociation of molecular
Bose-Einstein condensates: We develop a pairing mean-field theory to describe the quantum dynamics of
the dissociation of molecular Bose-Einstein condensates into their constituent
bosonic or fermionic atoms. We apply the theory to one, two, and
... | cond-mat_other |
A random matrix approach to detect defects in a strongly scattering
polycrystal: how the memory effect can help overcome multiple scattering: We report on ultrasonic imaging in a random heterogeneous medium. The goal is
to detect flaws embedded deeply into a polycrystalline material. A 64-element
array of piezoelectr... | cond-mat_other |
Spinor condensates with a laser-induced quadratic Zeeman effect: We show that an effective quadratic Zeeman effect can be generated in
$^{52}$Cr by proper laser configurations, and in particular by the dipole trap
itself. The induced quadratic Zeeman effect leads to a rich ground-state phase
diagram, can be used to ind... | cond-mat_other |
Conversion Efficiencies of Heteronuclear Feshbach Molecules: We study the conversion efficiency of heteronuclear Feshbach molecules in
population imbalanced atomic gases formed by ramping the magnetic field
adiabatically. We extend the recent work [J. E. Williams et al., New J. Phys.,
8, 150 (2006)] on the theory of Fe... | cond-mat_other |
X-ray Coherent diffraction interpreted through the fractional Fourier
transform: Diffraction of coherent x-ray beams is treated through the Fractionnal
Fourier transform. The transformation allow us to deal with coherent
diffraction experiments from the Fresnel to the Fraunhofer regime. The analogy
with the Huygens-F... | cond-mat_other |
Hall Effect of Light: We derive the semiclassical equation of motion for the wave-packet of light
taking into account the Berry curvature in the momentum space. This equation
naturally describes the interplay between the orbital and spin angular momenta,
i.e., the conservation of the total angular momentum of light. Th... | cond-mat_other |
Graphite vs graphene: scientific background: Nobel Prize in Physics 2010 was given for "groundbreaking experiments
regarding the two-dimensional material graphene." In fact, before graphene has
been extracted from graphite and measured, some of its fundamental physical
properties have already been experimentally uncove... | cond-mat_other |
Nonintegrable Schrodinger Discrete Breathers: In an extensive numerical investigation of nonintegrable translational motion
of discrete breathers in nonlinear Schrodinger lattices, we have used a
regularized Newton algorithm to continue these solutions from the limit of the
integrable Ablowitz-Ladik lattice. These solu... | cond-mat_other |
Edge-localized states in quantum one-dimensional lattices: In one-dimensional quantum lattice models with open boundaries, we find and
study localization at the lattice edge. We show that edge-localized eigenstates
can be found in both bosonic and fermionic systems, specifically, in the
Bose-Hubbard model with on-site ... | cond-mat_other |
Dynamical Aspects of Analogue Gravity: The Backreaction of Quantum
Fluctuations in Dilute Bose-Einstein Condensates: We discuss the backreaction force exerted by quantum fluctuations in dilute
Bose-Einstein condensates onto the motion of the classical background, derived
by an ab initio approach from microscopic phys... | cond-mat_other |
Stability of Inhomogeneous Multi-Component Fermi Gases: Two-component equal-mass Fermi gases, in which unlike atoms interact through
a short-range two-body potential and like atoms do not interact, are stable
even when the interspecies s-wave scattering length becomes infinitely large.
Solving the many-body Schroedinge... | cond-mat_other |
Interferences in the density of two Bose-Einstein condensates consisting
of identical or different atoms: The density of two {\it initially independent} condensates which are allowed
to expand and overlap can show interferences as a function of time due to
interparticle interaction. Two situations are separately disc... | cond-mat_other |
Adiabatic Transport of Bose-Einstein Condensate in Double- and
Triple-Well Traps: By using a close similarity between multi-photon and tunneling population
transfer schemes, we propose robust adiabatic methods for the transport of
Bose-Einstein condensate (BEC) in double- and triple-well traps. The
calculations withi... | cond-mat_other |
Three-Body Recombination of Identical Bosons with a Large Positive
Scattering Length at Nonzero Temperature: For identical bosons with a large scattering length, the dependence of the
3-body recombination rate on the collision energy is determined in the
zero-range limit by universal functions of a single scaling var... | cond-mat_other |
Beyond the locality approximation in the standard diffusion Monte Carlo
method: We present a way to include non local potentials in the standard Diffusion
Monte Carlo method without using the locality approximation. We define a
stochastic projection based on a fixed node effective Hamiltonian, whose lowest
energy is ... | cond-mat_other |
On applicability of differential mixing rules for statistically
homogeneous and isotropic dispersions: The classical differential mixing rules are assumed to be independent
effective-medium approaches, applicable to certain classes of systems. In the
present work, the inconsistency of differential models for macrosco... | cond-mat_other |
Reptation quantum Monte Carlo for lattice Hamiltonians with a
directed-update scheme: We provide an extension to lattice systems of the reptation quantum Monte
Carlo algorithm, originally devised for continuous Hamiltonians. For systems
affected by the sign problem, a method to systematically improve upon the
so-call... | cond-mat_other |
Joule expansion of a pure many-body state: We derive the Joule expansion of an isolated perfect gas from the principles
of quantum mechanics. Contrary to most studies of irreversible processes which
consider composite systems, the gas many-body Hilbert space cannot be
factorised into Hilbert spaces corresponding to int... | cond-mat_other |
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