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Feshbach resonances of harmonically trapped atoms: Employing a short-range two-channel description we derive an analytic model
of atoms in isotropic and anisotropic harmonic traps at a Feshbach resonance.
On this basis we obtain a new parameterization of the energy-dependent
scattering length which differs from the one... | cond-mat_quant-gas |
Curving the space by non-Hermiticity: Quantum systems are often classified into Hermitian and non-Hermitian ones.
Extraordinary non-Hermitian phenomena, ranging from the non-Hermitian skin
effect to the supersensitivity to boundary conditions, have been widely
explored. Whereas these intriguing phenomena have been cons... | cond-mat_quant-gas |
Two-dimensional dynamics of expansion of a degenerate Bose gas: Expansion of a degenerate Bose gas released from a pancakelike trap is
numerically simulated under the assumption of separation of the motion in the
plane of the loose initial trapping and the motion in the direction of the
initial tight trapping. The init... | cond-mat_quant-gas |
Spin 1 microcondensate in a magnetic field: semiclassics and exact
solution: We study a spin 1 Bose condensate small enough to be treated as a single
magnetic `domain': a system that we term a microcondensate. Because all
particles occupy a single spatial mode, this quantum many body system has a
well defined classic... | cond-mat_quant-gas |
Multi-wavelength holography with a single Spatial Light Modulator for
ultracold atom experiments: We demonstrate a method to create arbitrary intensity distributions of
multiple wavelengths of light, which can be useful for ultracold atom
experiments, by using regional phase-calculation algorithms to find a single
ho... | cond-mat_quant-gas |
Thermalized Abrikosov lattices from decaying turbulence in rotating BECs: We study the long-time decay of rotating turbulence in Bose-Einstein
condensates (BECs). We consider the Gross-Pitaevskii equation in a rotating
frame of reference, and review different formulations for the Hamiltonian of a
rotating BEC. We discu... | cond-mat_quant-gas |
Ultracold Atomic Gases: Novel States of Matter: Article to appear in the Encyclopedia of Complexity and Systems Science, Dr.
R. A. Meyers (Ed.) (Springer Heidelberg, 2009). | cond-mat_quant-gas |
Faraday patterns in spin-orbit coupled Bose-Einstein condensates: We study the Faraday patterns generated by spin-orbit-coupling induced
parametric resonance in a spinor Bose-Einstein condensate with repulsive
interaction. The collective elementary excitations of the Bose-Einstein
condensate, including density waves an... | cond-mat_quant-gas |
Entanglement prethermalization: Locally thermal but non-locally
non-thermal states in a one-dimensional Bose gas: A well-isolated system often shows relaxation to a quasi-stationary state
before reaching thermal equilibrium. Such a prethermalization has attracted
considerable interest recently in association with clo... | cond-mat_quant-gas |
Persistent oscillations of the order parameter and interaction quench
phase diagram for a confined Bardeen-Cooper-Schrieffer Fermi gas: We present a numerical study of the interaction quench dynamics in a
superfluid ultracold Fermi gas confined in a three-dimensional cigar-shaped
harmonic trap. In the present paper w... | cond-mat_quant-gas |
Stability of Excited Dressed States with Spin-Orbit Coupling: We study the decay behaviors of ultracold atoms in metastable states with
spin-orbit coupling (SOC), and demonstrate that there are two SOC-induced decay
mechanisms. One arises from the trapping potential and the other is due to
interatomic collision. We pre... | cond-mat_quant-gas |
Quantum theory of bright matter wave solitons in harmonic confinement: This paper investigates bright quantum-matter-wave solitons beyond the
Gross-Pitaevskii equation (GPE). As proposals for interferometry and creating
nonlocal quantum superpositions have been formed, it has become necessary to
investigate effects not... | cond-mat_quant-gas |
Exact solutions to the four Goldstone modes around a dark soliton of the
nonlinear Schroedinger equation: This article is concerned with the linearisation around a dark soliton
solution of the nonlinear Schr\"odinger equation. Crucially, we present
analytic expressions for the four linearly-independent zero eigenvalu... | cond-mat_quant-gas |
Interaction induced dynamical $\mathcal{PT}$ symmetry breaking in
dissipative Fermi-Hubbard models: We investigate the dynamical properties of one-dimensional dissipative
Fermi-Hubbard models, which are described by the Lindblad master equations with
site-dependent jump operators. The corresponding non-Hermitian effe... | cond-mat_quant-gas |
Coherent Interaction of a Single Fermion with a Small Bosonic Field: We have experimentally studied few-body impurity systems consisting of a
single fermionic atom and a small bosonic field on the sites of an optical
lattice. Quantum phase revival spectroscopy has allowed us to accurately
measure the absolute strength ... | cond-mat_quant-gas |
Asymmetric Particle Transport and Light-Cone Dynamics Induced by Anyonic
Statistics: We study the non-equilibrium dynamics of Abelian anyons in a one-dimensional
system. We find that the interplay of anyonic statistics and interactions gives
rise to spatially asymmetric particle transport together with a novel dynami... | cond-mat_quant-gas |
Spin and mass currents near a moving magnetic obstacle in a
two-component Bose-Einstein condensate: We study the spatial distributions of the spin and mass currents generated by
a moving Gaussian magnetic obstacle in a symmetric, two-component Bose-Einstein
condensate in two dimensions. We analytically describe the c... | cond-mat_quant-gas |
Many-body approach to low-lying collective excitations in a BEC
approaching collapse: An approximate many-body theory incorporating two-body correlations has been
employed to calculate low-lying collective multipole frequencies in a
Bose-Einstein condensate containing $A$ bosons, for different values of the
interacti... | cond-mat_quant-gas |
Optical lattice for tripod-like atomic level structure: Standard optical potentials use off-resonant laser standing wave induced
AC-Stark shift. In a recent development [Phys. Rev. Lett. {\bf 117}, 233001
(2016)] a three-level scheme in $\Lambda$ configuration coupled coherently by
resonant laser fields was introduced ... | cond-mat_quant-gas |
Quantum-granularity effect in the formation of supermixed solitons in
ring lattices: We investigate a notable class of states peculiar to a bosonic binary mixture
featuring repulsive intraspecies and attractive interspecies couplings. We
evidence that, for small values of the hopping amplitudes, one can access
partic... | cond-mat_quant-gas |
Quantum-torque-induced breaking of magnetic interfaces in ultracold
gases: A rich variety of physical effects in spin dynamics arises at the interface
between different magnetic materials. Engineered systems with interlaced
magnetic structures have been used to implement spin transistors, memories and
other spintroni... | cond-mat_quant-gas |
Tunable Wigner States with Dipolar Atoms and Molecules: We study the few-body physics of trapped atoms or molecules with electric or
magnetic dipole moments aligned by an external field. Using exact numerical
diagonalization appropriate for the strongly correlated regime, as well as a
classical analysis, we show how Wi... | cond-mat_quant-gas |
Dissipation-induced dynamical phase transition in postselected quantum
trajectories: It is known that effects of dissipation or measurement backreaction in
postselected quantum trajectories are described by non-Hermitian Hamiltonian,
but their consequences in real-time dynamics of many-body systems are yet to be
eluc... | cond-mat_quant-gas |
Feynman path-integral treatment of the Bose polaron beyond the
Fröhlich model: An impurity immersed in a Bose-Einstein condensate is no longer accurately
described by the Fr\"ohlich Hamiltonian as the coupling between the impurity
and the boson bath gets stronger. We study the dominant effects of the
two-phonon terms... | cond-mat_quant-gas |
Measuring molecular electric dipoles using trapped atomic ions and
ultrafast laser pulses: We study a hybrid quantum system composed of an ion and an electric dipole.
We show how a trapped ion can be used to measure the small electric field
generated by a classical dipole. We discuss the application of this scheme to... | cond-mat_quant-gas |
Finite-size effects on the Bose-Einstein condensation critical
temperature in a harmonic trap: We obtain second and higher order corrections to the shift of the
Bose-Einstein critical temperature due to finite-size effects. The confinement
is that of a harmonic trap with general anisotropy. Numerical work shows the
h... | cond-mat_quant-gas |
Controlling particle current in a many-body quantum system by external
driving: We propose a method to control the particle current of a one-dimensional
quantum system by resonating two many-body states through an external driving
field. We consider the Bose-Hubbard and spinless Fermi-Hubbard models with the
Peierls ... | cond-mat_quant-gas |
Few-to-many vortex states of density-angular-momentum coupled
Bose-Einstein condensates: Motivated by recent experiments, we theoretically study a gas of atomic
bosons confined in an elliptical harmonic trap; forming a quasi-two-dimensional
atomic Bose-Einstein condensate subject to a density-dependent gauge potentia... | cond-mat_quant-gas |
Orbital superfluidity in the $P$-band of a bipartite optical square
lattice: The successful emulation of the Hubbard model in optical lattices has
stimulated world wide efforts to extend their scope to also capture more
complex, incompletely understood scenarios of many-body physics. Unfortunately,
for bosons, Feynma... | cond-mat_quant-gas |
Buckling transitions and clock order of two-dimensional Coulomb crystals: Crystals of repulsively interacting ions in planar traps form hexagonal
lattices, which undergo a buckling instability towards a multi-layer structure
as the transverse trap frequency is reduced. Numerical and experimental results
indicate that t... | cond-mat_quant-gas |
Spin-orbit coupling in the presence of strong atomic correlations: We explore the influence of contact interactions on a synthetically
spin-orbit coupled system of two ultracold trapped atoms. Even though the
system we consider is bosonic, we show that a regime exists in which the
competition between the contact and sp... | cond-mat_quant-gas |
Generalized Hydrodynamics in the 1D Bose gas: theory and experiments: We review the recent theoretical and experimental progress regarding the
Generalized Hydrodynamics (GHD) behavior of the one-dimensional Bose gas with
contact repulsive interactions, also known as the Lieb-Liniger gas. In the
first section, we review... | cond-mat_quant-gas |
Multiorder topological superfluid phase transitions in a two-dimensional
optical superlattice: Higher-order topological superfluids have gapped bulk and symmetry-protected
Majorana zero modes with various localizations. Motivated by recent advances,
we present a proposal for synthesizing multi-order topological super... | cond-mat_quant-gas |
Dipolar fermions in a multilayer geometry: We investigate the behavior of identical dipolar fermions with aligned dipole
moments in two-dimensional multilayers at zero temperature. We consider density
instabilities that are driven by the attractive part of the dipolar interaction
and, for the case of bilayers, we eluci... | cond-mat_quant-gas |
Flowing bosonization in the nonperturbative functional
renormalization-group approach: Bosonization allows one to describe the low-energy physics of one-dimensional
quantum fluids within a bosonic effective field theory formulated in terms of
two fields: the "density" field $\varphi$ and its conjugate partner, the ph... | cond-mat_quant-gas |
Emergent patterns in a spin-orbit coupled spin-2 Bose-Einstein
condensate: The ground-state phases of a spin-orbit (SO) coupled atomic spin-2
Bose-Einstein condensate (BEC) are studied. Interesting density patterns
spontaneously formed are widespread due to the competition between SO coupling
and spin-dependent inter... | cond-mat_quant-gas |
Coherent phase slips in coupled matter-wave circuits: Quantum Phase slips are dual process of particle tunneling in coherent
networks. Besides to be of central interest for condensed matter physics,
quantum phase slips are resources that are sought to be manipulated in quantum
circuits. Here, we devise a specific matte... | cond-mat_quant-gas |
BCS-BEC crossover at finite temperature in spin-orbit coupled Fermi
gases: By adopting a $T$-matrix-based method within the $G_0G$ approximation for the
pair susceptibility, we study the effects of the pairing fluctuation on the
three-dimensional spin-orbit coupled Fermi gases at finite temperature. The
critical temp... | cond-mat_quant-gas |
Superdiffusive nonequilibrium motion of an impurity in a Fermi sea: We treat the nonequilibrium motion of a single impurity atom in a
low-temperature single-species Fermi sea, interacting via a contact
interaction. In the nonequilibrium regime, the impurity does a superdiffusive
geometric random walk where the typical ... | cond-mat_quant-gas |
Creating quantum many-body scars through topological pumping of a 1D
dipolar gas: Quantum many-body scars, long-lived excited states of correlated quantum
chaotic systems that evade thermalization, are of great fundamental and
technological interest. We create novel scar states in a bosonic 1D quantum gas
of dysprosi... | cond-mat_quant-gas |
Multi-particle composites in density-imbalanced quantum fluids: We consider two-component one-dimensional quantum gases with density
imbalance. While generically such fluids are two-component Luttinger liquids,
we show that if the ratio of the densities is a rational number, p/q, and mass
asymmetry between components i... | cond-mat_quant-gas |
Flux enhanced localization and reentrant delocalization in the quantum
walk of interacting bosons on two-leg ladder: We study the quantum walk of two bosons possessing onsite repulsive
interaction on a two-leg ladder and show that the presence of uniform flux
piercing through the plaquettes of the ladder favors the l... | cond-mat_quant-gas |
Dynamical Equilibration of Topological Properties: We study the dynamical process of equilibration of topological properties in
quantum many-body systems undergoing a parameter quench between two
topologically inequivalent Hamiltonians. This scenario is motivated by recent
experiments on ultracold atomic gases, where a... | cond-mat_quant-gas |
Controlling Dipolar Exchange Interactions in a Dense 3D Array of Large
Spin Fermions: Dipolar interactions are ubiquitous in nature and rule the behavior of a
broad range of systems spanning from energy transfer in biological systems to
quantum magnetism. Here, we study magnetization-conserving dipolar induced
spin-e... | cond-mat_quant-gas |
How is the density of quasi-two-dimensional uniform dipolar quantum Bose
gases affected by trap imperfections?: We theoretically investigate the impact of weak perturbations of a flat
potential on the density of a quasi-two-dimensional dipolar Bose gas. We use a
mean-field perturbative treatment of the potential defe... | cond-mat_quant-gas |
Spin conductivity spectrum and spin superfluidity in a binary Bose
mixture: We investigate the spectrum of spin conductivity for a miscible two-component
Bose-Einstein condensate (BEC) that exhibits spin superfluidity. By using the
Bogoliubov theory, the regular part being the spin conductivity at finite ac
frequency... | cond-mat_quant-gas |
Singular mean-field states: A brief review of recent results: This article provides a focused review of recent findings which demonstrate,
in some cases quite counter-intuitively, the existence of bound states with a
singularity of the density pattern at the center, while the states are
physically meaningful because th... | cond-mat_quant-gas |
Dynamics of spatial coherence and momentum distribution of polaritons in
a semiconductor microcavity under conditions of Bose-Einstein condensation: The dynamics of spatial coherence and momentum distribution of polaritons in
the regime of Bose-Einstein condensation are investigated in a GaAs microcavity
with embedde... | cond-mat_quant-gas |
Quantum information theoretic measures to distinguish fermionized bosons
from non-interacting fermions: We study the dynamical fermionization of strongly interacting one-dimensional
bosons in Tonks-Girardeau limit by solving the time dependent many-boson
Schr\"odinger equation numerically exactly. We establish that t... | cond-mat_quant-gas |
Dynamics of exciton-polaritons in a Josephson double dimer: We study the dynamics of exciton-polaritons in a double-well configuration.
The system consists of two weakly coupled Bose-Josephson junctions, each
corresponding to a different circular polarization of the polaritons, forming a
{\it Josephson double dimer}. W... | cond-mat_quant-gas |
Evidence of a liquid phase in interacting Bosons at intermediate
densities: In this paper, we present evidence for a liquid-like phase in systems of many
interacting Bosons at intermediate densities. The interacting Bose gas has been
studied extensively in the low and high density regimes, in which interactions
do no... | cond-mat_quant-gas |
Bidirectional dynamic scaling in an isolated Bose gas far from
equilibrium: Understanding and classifying nonequilibrium many-body phenomena, analogous
to the classification of equilibrium states of matter into universality
classes, is an outstanding problem in physics. Any many-body system, from
stellar matter to fi... | cond-mat_quant-gas |
Rotational pendulum dynamics of a vortex molecule in a channel geometry: A vortex molecule is a topological excitation in two coherently coupled
superfluids consisting of a vortex in each superfluid connected by a domain
wall of the relative phase, also known as a Josephson vortex. We investigate
the dynamics of this e... | cond-mat_quant-gas |
Bose-Einstein Condensation of 84-Sr: We report Bose-Einstein condensation of 84-Sr in an optical dipole trap.
Efficient laser cooling on the narrow intercombination line and an ideal s-wave
scattering length allow creation of large condensates (N0 ~ 3x10^5) even though
the natural abundance of this isotope is only 0.6%... | cond-mat_quant-gas |
Dynamic Structure Factor of Normal Fermi Gas from Collisionless to
Hydrodynamic Regime: The dynamic structure factor of a normal Fermi gas is investigated by using
the moment method for the Boltzmann equation. We determine the spectral
function at finite temperatures over the full range of crossover from the
collisio... | cond-mat_quant-gas |
Small two-component Fermi gases in a cubic box with periodic boundary
conditions: The properties of two-component Fermi gases become universal if the
interspecies s-wave scattering length $a_s$ and the average interparticle
spacing are much larger than the range of the underlying two-body potential.
Using an explicit... | cond-mat_quant-gas |
Driven-dissipative many-body pairing states for cold fermionic atoms in
an optical lattice: We discuss the preparation of many-body states of cold fermionic atoms in an
optical lattice via controlled dissipative processes induced by coupling the
system to a reservoir. Based on a mechanism combining Pauli blocking and... | cond-mat_quant-gas |
AtomECS: Simulate laser cooling and magneto-optical traps: AtomECS is a software package that efficiently simulates the motion of
neutral atoms experiencing forces exerted by laser radiation, such as in
magneto-optical traps and Zeeman slowers. The program is implemented using the
Entity-Component-System pattern, which... | cond-mat_quant-gas |
Localization in spin chains with facilitation constraints and disordered
interactions: Quantum many-body systems with kinetic constraints exhibit intriguing
relaxation dynamics. Recent experimental progress in the field of cold atomic
gases offers a handle for probing collective behavior of such systems, in
particula... | cond-mat_quant-gas |
Grüneisen Parameter for Gases: The Gr\"uneisen ratio ($\Gamma$), i.e.\,the ratio of the linear thermal
expansivity to the specific heat at constant pressure, quantifies the degree of
anharmonicity of the potential governing the physical properties of a system.
While $\Gamma$ has been intensively explored in solid state... | cond-mat_quant-gas |
Signatures of Fractional Exclusion Statistics in the Spectroscopy of
Quantum Hall Droplets: We show how spectroscopic experiments on a small Laughlin droplet of rotating
bosons can directly demonstrate Haldane fractional exclusion statistics of
quasihole excitations. The characteristic signatures appear in the
single... | cond-mat_quant-gas |
Rapidity distribution within the defocusing non-linear Schrödinger
equation model: We consider the classical field integrable system whose evolution equation is
the nonlinear Schr\"odinger equation with defocusing non-linearities, which is
the classical limit of the quantum Lieb-Liniger model. We propose a simple
der... | cond-mat_quant-gas |
Pairing and the spin susceptibility of the polarized unitary Fermi gas
in the normal phase: We theoretically study the pairing behavior of the unitary Fermi gas in the
normal phase. Our analysis is based on the static spin susceptibility, which
characterizes the response to an external magnetic field. We obtain this
... | cond-mat_quant-gas |
Non-perturbative method to compute thermal correlations in
one-dimensional systems: A brief overview: We develop a highly efficient method to numerically simulate thermal
fluctuations and correlations in non-relativistic continuous bosonic
one-dimensional systems. We start by noticing the equivalence of their
descrip... | cond-mat_quant-gas |
Miscibility-Immiscibility transition of strongly interacting bosonic
mixtures in optical lattices: Interaction plays key role in the mixing properties of a multi-component
system. The miscibility-immiscibility transition (MIT) in a weakly interacting
mixture of Bose gases is predominantly determined by the strengths ... | cond-mat_quant-gas |
Adiabatic spin cooling using high-spin Fermi gases: Spatial entropy redistribution plays a key role in adiabatic cooling of
ultra-cold lattice gases. We show that high-spin fermions with a spatially
variable quadratic Zeeman coupling may allow for the creation of an inner
spin-1/2 core surrounded by high-spin wings. Th... | cond-mat_quant-gas |
Two-Stage Melting in Systems of Strongly Interacting Rydberg Atoms: We analyze the ground state properties of a one-dimensional cold atomic
system in a lattice, where Rydberg excitations are created by an external laser
drive. In the classical limit, the ground state is characterized by a complete
devil's staircase for... | cond-mat_quant-gas |
Probing quantum transport by engineering correlations in a speckle
potential: We develop a procedure to modify the correlations of a speckle potential.
This procedure, that is suitable for spatial light modulator devices, allows
one to increase the localization efficiency of the speckle in a narrow energy
region whos... | cond-mat_quant-gas |
Vortex gyroscope imaging of planar superfluids: We propose a robust imaging technique that makes it possible to distinguish
vortices from antivortices in quasi-two-dimensional Bose--Einstein condensates
from a single image of the density of the atoms. Tilting the planar condensate
prior to standard absorption imaging e... | cond-mat_quant-gas |
Quantum interferometry at zero and finite temperature with two-mode
bosonic Josephson junctions: We analyze phase interferometry realized with a bosonic Josephson junction
made of trapped dilute and ultracold atoms. By using a suitable phase
sensitivity indicator we study the zero temperature junction states useful t... | cond-mat_quant-gas |
Topological semimetal in a fermionic optical lattice: Optical lattices play a versatile role in advancing our understanding of
correlated quantum matter. The recent implementation of orbital degrees of
freedom in chequerboard and hexagonal optical lattices opens up a new thrust
towards discovering novel quantum states ... | cond-mat_quant-gas |
Resonant dipolar collisions of ultracold molecules induced by microwave
dressing: We demonstrate microwave dressing on ultracold, fermionic
${}^{23}$Na${}^{40}$K ground-state molecules and observe resonant dipolar
collisions with cross sections exceeding three times the $s$-wave unitarity
limit. The origin of these c... | cond-mat_quant-gas |
Effect of anisotropic spin-orbit coupling on condensation and
superfluidity of a two dimensional Fermi gases: We investigated the ground state properties of a two dimensional Fermi
superfluid with an anisotropic spin-orbit coupling (SOC) using path-integral
field theoretical method. Within the framework of mean-field... | cond-mat_quant-gas |
Imaginary Potential Induced Quantum Coherence for Bose-Einstein
Condensates: The role of complex potentials in single-body Schr\H{o}dinger equation has
been studied intensively. We study the quantum coherence for degenerate Bose
gases in complex potentials, when the exchange symmetry of identical bosons is
considered... | cond-mat_quant-gas |
Two-body momentum correlations in a weakly interacting one-dimensional
Bose gas: We analyze the two-body momentum correlation function for a uniform weakly
interacting one-dimensional Bose gas. We show that the strong positive
correlation between opposite momenta, expected in a Bose-Einstein condensate
with a true lo... | cond-mat_quant-gas |
Chiral confinement in quasirelativistic Bose-Einstein condensates: In the presence of a laser-induced spin-orbit coupling an interacting ultra
cold spinor Bose-Einstein condensate may acquire a quasi-relativistic character
described by a non-linear Dirac-like equation. We show that as a result of the
spin-orbit couplin... | cond-mat_quant-gas |
Superfluid to Mott insulator transition in the one-dimensional
Bose-Hubbard model for arbitrary integer filling factors: We study the quantum phase transition between the superfluid and the Mott
insulator in the one-dimensional (1D) Bose-Hubbard model. Using the
time-evolving block decimation method, we numerically c... | cond-mat_quant-gas |
The spin evolution of spin-3 $^{52}$Cr Bose-Einstein condensate: The spin evolution of a Bose-Einstein condensate starting from a mixture of
two or three groups of $^{52}$Cr (spin-3) atoms in an optical trap has been
studied theoretically. The initial state is so chosen that the system does not
distinguish up and down.... | cond-mat_quant-gas |
Dynamics of first-order quantum phase transitions in extended
Bose-Hubbard model: From density wave to superfluid and vice-versa: In this paper, we study the nonequilibrium dynamics of the Bose-Hubbard model
with the nearest-neighbor repulsion by using time-dependent Gutzwiller (GW)
methods. In particular, we vary th... | cond-mat_quant-gas |
Many-body exceptional points in colliding condensates: Exceptional points describe the coalescence of the eigenmodes of a
non-Hermitian matrix. When an exceptional point occurs in the unitary evolution
of a many-body system, it generically leads to a dynamical instability with a
finite wavevector [N. Bernier \etal, Phy... | cond-mat_quant-gas |
Three Identical Fermions with Resonant p-wave Interactions in Two
Dimensions: A new kind of "super-Efimov" states of binding energies scaling as
$\ln|E_n|\sim-e^{3n\pi/4}$ were predicted by a field theory calculation for
three fermions with resonant $p$-wave interactions in two dimensions [Phys.
Rev. Lett. \textbf{11... | cond-mat_quant-gas |
Relation between the noise correlations and the spin structure factor
for Mott-insulating states in SU$(N)$ Hubbard models: It is well established that the noise correlations measured by time-of-flight
imaging in cold-atom experiments, which correspond to the density-density
correlations in the momentum space of trap... | cond-mat_quant-gas |
Thermodynamics of a spin-1 Bose gas with fixed magnetization: We investigate the thermodynamics of a spin-1 Bose gas with fixed
magnetization including the quadratic Zeeman energy shift. Our calculations are
based on the grand canonical description for the ideal gas and the classical
fields approximation for atoms with... | cond-mat_quant-gas |
Dynamical Cluster Quantum Monte Carlo Study of the Single Particle
Spectra of Strongly Interacting Fermion Gases: We study the single-particle spectral function of resonantly-interacting
fermions in the unitary regime, as described by the three-dimensional
attractive Hubbard model in the dilute limit. Our approach, b... | cond-mat_quant-gas |
Pseudopotential for the 2D contact interaction: We propose a smooth pseudopotential for the contact interaction acting
between ultracold atoms confined to two dimensions. The pseudopotential
reproduces the scattering properties of the repulsive contact interaction up to
200 times more accurately than a hard disk potent... | cond-mat_quant-gas |
Particle Fluctuations in Mesoscopic Bose Systems: Particle fluctuations in mesoscopic Bose systems of arbitrary spatial
dimensionality are considered. Both ideal Bose gases and interacting Bose
systems are studied in the regions above the Bose-Einstein condensation
temperature $T_c$ as well as below this temperature. T... | cond-mat_quant-gas |
How creating one additional well can generate Bose-Einstein condensation: The realization of Bose-Einstein condensation in ultracold trapped gases has
led to a revival of interest in that fascinating quantum phenomenon. This
experimental achievement necessitated both extremely low temperatures and
sufficiently weak int... | cond-mat_quant-gas |
Critical velocity, vortex shedding and drag in a unitary Fermi
superfluid: We study the real-time motion of a microscopic object in a cold Fermi gas at
unitary conditions by using an extended Thomas-Fermi density functional
approach. We find that spontaneous creation of singly quantized
vortex-antivortex pairs occurs... | cond-mat_quant-gas |
Direct Observation of Fragmentation in a Disordered, Strongly
Interacting Fermi Gas: Describing the behaviour of strongly interacting particles in the presence of
disorder is among the most challenging problems in quantum many-body physics.
The controlled setting of cold atom experiments provides a new avenue to
addr... | cond-mat_quant-gas |
Correlated quantum dynamics of graphene: Phase-space representations are a family of methods for dynamics of both
bosonic and fermionic systems, that work by mapping the system's density matrix
to a quasi-probability density and the Liouville-von Neumann equation of the
Hamiltonian to a corresponding density differenti... | cond-mat_quant-gas |
Strong Boundary and Trap Potential Effects on Emergent Physics in
Ultra-Cold Fermionic Gases: The field of quantum simulations in ultra-cold atomic gases has been
remarkably successful. In principle it allows for an exact treatment of a
variety of highly relevant lattice models and their emergent phases of matter.
Bu... | cond-mat_quant-gas |
The response to dynamical modulation of the optical lattice for fermions
in the Hubbard model: Fermionic atoms in a periodic optical lattice provide a realization of the
single-band Hubbard model. Using Quantum Monte Carlo simulations along with the
Maximum Entropy Method, we evaluate the effect of a time-dependent p... | cond-mat_quant-gas |
Decoherence of an impurity in a one-dimensional fermionic bath with mass
imbalance: We study the transport, decoherence and dissipation of an impurity
interacting with a bath of free fermions in a one-dimensional lattice.
Numerical simulations are made with the time-evolving block decimation method.
We introduce a ma... | cond-mat_quant-gas |
Rotating Fulde-Ferrell-Larkin-Ovchinnikov state in cold Fermi gases: We study an effect of rotation on the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO)
state of two component Fermi superfluid gases in a toroidal trap. We
investigate a stability of the FFLO states in the quasi-one-dimensional regime
on the basis of the Bogol... | cond-mat_quant-gas |
Bloch oscillations of spin-orbit-coupled cold atoms in an optical
lattice and spin current generation: We study the Bloch oscillation dynamics of a spin-orbit-coupled cold atomic
gas trapped inside a one-dimensioanl optical lattice. The eigenspectra of the
system is identified as two interpenetrating Wannier-Stark la... | cond-mat_quant-gas |
Mixtures of ultra-cold atoms in 1D disordered potentials: We study interacting 1D two-component mixtures of cold atoms in a random
potential, and extend the results reported earlier [{\it Phys. Rev. Lett.} {\bf
105}, 115301 (2010)]. We construct the phase diagram of a disordered Bose-Fermi
mixture as a function of the ... | cond-mat_quant-gas |
Lattice bosons with infinite range checkerboard interactions: Motivated by experiments performed by Landig et al. [Nature 532, 476-479], we
consider a two dimensional Bose gas in an optical lattice, trapped inside a
single mode superradiant Fabry Perot cavity. The cavity mediates infinite range
checkerboard interaction... | cond-mat_quant-gas |
Theory of Non-Hermitian Fermionic Superfluidity with a Complex-Valued
Interaction: Motivated by recent experimental advances in ultracold atoms, we analyze a
non-Hermitian (NH) BCS Hamiltonian with a complex-valued interaction arising
from inelastic scattering between fermions. We develop a mean-field theory to
obtai... | cond-mat_quant-gas |
Quantum phases in spin-orbit-coupled Floquet spinor Bose gases: We propose a spin-orbit-coupled Floquet spinor Bose-Einstein condensate (BEC)
which can be implemented by Floquet engineering of a quadratic Zeeman field.
The Floquet spinor BEC has a Bessel-function-modulated Rabi frequency and a
Floquet-induced spin-exch... | cond-mat_quant-gas |
First-order superfluid to Mott-insulator phase transitions in spinor
condensates: We observe evidence of first-order superfluid to Mott-insulator quantum phase
transitions in a lattice-confined antiferromagnetic spinor Bose-Einstein
condensate. The observed signatures include hysteresis effect and significant
heating... | cond-mat_quant-gas |
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