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Driven dissipative preparation of few-body Laughlin states of Rydberg
polaritons in twisted cavities: We present a driven dissipative protocol for creating an optical analog of
the Laughlin state in a system of Rydberg polaritons in a twisted optical
cavity. We envision resonantly driving the system into a 4-polarito... | cond-mat_quant-gas |
Mobility edge of the two dimensional Bose-Hubbard model: We analyze the disorder driven localization of the two dimensional
Bose-Hubbard model by evaluating the full low energy quasiparticle spectrum via
a recently developed fluctuation operator expansion method. For any strength of
the local interaction we find a mobi... | cond-mat_quant-gas |
Thermodynamics of the Hubbard model on stacked honeycomb and square
lattices: We present a numerical study of the Hubbard model on simply stacked honeycomb
and square lattices, motivated by a recent experimental realization of such
models with ultracold atoms in optical lattices. We perform simulations with
different... | cond-mat_quant-gas |
Confinement in 1+1D $\mathbb{Z}_2$ Lattice Gauge Theories at Finite
Temperature: Confinement is a paradigmatic phenomenon of gauge theories, and its
understanding lies at the forefront of high-energy physics. Here, we study
confinement in a simple one-dimensional \Zt lattice gauge theory at finite
temperature and fil... | cond-mat_quant-gas |
Momentum-Space Josephson Effects: The Josephson effect is a prominent phenomenon of quantum supercurrents that
has been widely studied in superconductors and superfluids. Typical Josephson
junctions consist of two real-space superconductors (superfluids) coupled
through a weak tunneling barrier. Here we propose a momen... | cond-mat_quant-gas |
Thermalization measurements on an ultracold mixture of metastable $^4$He
and $^{87}$Rb atoms in a quadrupole magnetic trap: Recently we have reported (Knoop et al. [arXiv:1404.4826]) on an experimental
determination of metastable triplet $^4$He+$^{87}$Rb scattering length by
performing thermalization measurements for... | cond-mat_quant-gas |
Temperature Dependent Density Profiles of Dipolar Droplets: Recently, trapped dipolar gases were observed to form high density droplets
in a regime where mean field theory predicts collapse. These droplets present a
novel form of equilibrium where quantum fluctuations are critical for
stability. So far, the effect of q... | cond-mat_quant-gas |
Quasi-one-dimensional Bose-Einstein condensates in nonlinear lattices: We consider the three-dimensional (3D) mean-field model for the Bose-Einstein
condensate (BEC), with a 1D nonlinear lattice (NL), which periodically changes
the sign of the nonlinearity along the axial direction, and the
harmonic-oscillator trapping... | cond-mat_quant-gas |
Quenched Magneto-association of Ultracold Feshbach Molecules: We study enhanced magneto-association of atoms into weakly-bound molecules
near a Feshbach resonance using a quench preparatory stage. In anticipation of
experiments with NASA's Cold Atom Laboratory aboard the International Space
Station, we assume as a base... | cond-mat_quant-gas |
Dynamical mean-field driven spinor condensate physics beyond the
single-mode approximation: $^{23}$Na spin-1 Bose-Einstein condensates are used to experimentally
demonstrate that mean-field physics beyond the single-mode approximation can be
relevant during the non-equilibrium dynamics. The experimentally observed sp... | cond-mat_quant-gas |
Lattice supersolid phase of strongly correlated bosons in an optical
cavity: We numerically simulate strongly correlated ultracold bosons coupled to a
high-finesse cavity field, pumped by a laser beam in the transverse direction.
Assuming a weak classical optical lattice added in the cavity direction, we
model this s... | cond-mat_quant-gas |
Scaling solutions of the two fluid hydrodynamic equations in a
harmonically trapped gas at unitarity: We prove that the two fluid Landau hydrodynamic equations, when applied to a
gas interacting with infinite scattering length (unitary gas) in the presence
of harmonic trapping, admit exact scaling solutions of mixed ... | cond-mat_quant-gas |
Confinement-induced Resonance of Alkaline-earth-metal-like Atoms in
Anisotropic Quasi-one-dimensional Traps: We study the confinement-induced resonance (CIR) of $^{173}$Yb atoms near an
orbital Feshbach resonance in a quasi-one-dimensional tube with transversal
anisotropy. By solving the two-body scattering problem, ... | cond-mat_quant-gas |
Supersolid phases of bosonic particles in a bubble trap: Confinement can have a considerable effect on the behavior of particle
systems, and is therefore an effective way to discover new phenomena. A notable
example is a system of identical bosons at low temperature under an external
field mimicking an isotropic bubble... | cond-mat_quant-gas |
Type-II Weyl Points in Three-Dimensional Cold Atom Optical Lattices: Topological Lifshitz phase transition characterizes an abrupt change of the
topology of the Fermi surface through a continuous deformation of parameters.
Recently, Lifshitz transition has been predicted to separate two types of Weyl
points: type-I and... | cond-mat_quant-gas |
Sound propagation in a Bose-Fermi mixture: from weak to strong
interactions: Particle-like excitations, or quasi-particles, emerging from interacting
fermionic and bosonic quantum fields underlie many intriguing quantum phenomena
in high energy and condensed matter systems. Computation of the properties of
these exci... | cond-mat_quant-gas |
Manifold approach for a many-body Wannier-Stark system: localization and
chaos in energy space: We study the resonant tunneling effect in a many-body Wannier-Stark system,
realized by ultracold bosonic atoms in an optical lattice subjected to an
external Stark force. The properties of the many-body system are effecti... | cond-mat_quant-gas |
Fractional quantum anomalous Hall phase for Raman superarray of Rydberg
atoms: Rydberg atom arrays offer promising platforms for quantum simulation of
correlated quantum matter and raise great interests. This work proposes a novel
stripe-lattice model with Raman superarray of Rydberg atoms to realize bosonic
fraction... | cond-mat_quant-gas |
Thermometry by correlated dephasing of impurities in a 1D Fermi gas: We theoretically investigate the pure dephasing dynamics of two static
impurity qubits embedded within a common environment of ultracold fermionic
atoms, which are confined to one spatial dimension. Our goal is to understand
how bath-mediated interact... | cond-mat_quant-gas |
Density correlations from analogue Hawking radiation in the presence of
atom losses: The sonic analogue of Hawking radiation can now be experimentally recreated
in Bose-Einstein Condensates that contain an acoustic black hole. In these
experiments the signal strength and analogue Hawking temperature increase for
dens... | cond-mat_quant-gas |
Dynamics of Few Co-rotating Vortices in Bose-Einstein Condensates: We study the dynamics of small vortex clusters with few (2--4) co-rotating
vortices in Bose-Einstein condensates by means of experiments, numerical
computations, and theoretical analysis. All of these approaches corroborate the
counter-intuitive presenc... | cond-mat_quant-gas |
A continuum of compass spin models on the honeycomb lattice: Quantum spin models with spatially dependent interactions, known as compass
models, play an important role in the study of frustrated quantum magnetism.
One example is the Kitaev model on the honeycomb lattice with spin-liquid
ground states and anyonic excita... | cond-mat_quant-gas |
Generalized parametric resonance in a spin-1 Bose-Einstein condensate: We propose a generalized Mathieu equation (GME) which describes well the
dynamics for two different models in spin-1 Bose-Einstein condensates. The
stability chart of this GME differs significantly from that of Mathieu's
equation and the unstable dy... | cond-mat_quant-gas |
Hartree-Fock-Bogoliubov Model and Simulation of Attractive and Repulsive
Bose-Einstein Condensates: We describe a model of dynamic Bose-Einstein condensates near a Feshbach
resonance that is computationally feasible under assumptions of spherical or
cylindrical symmetry. Simulations in spherical symmetry approximate ... | cond-mat_quant-gas |
Quench dynamics of a Bose-Einstein condensate under synthetic spin-orbit
coupling: We study the quench dynamics of a Bose-Einstein condensate under a
Raman-assisted synthetic spin-orbit coupling. To model the dynamical process,
we adopt a self-consistent Bogoliubov approach, which is equivalent to applying
the time-d... | cond-mat_quant-gas |
Symmetry breaking Rayleigh-Taylor instability in a two-component
Bose-Einstein condensate: The interfacial instability and subsequent dynamics in a phase-separated
two-component Bose-Einstein condensate with rotation symmetry are studied. When
the interatomic interaction or the trap frequency is changed, the
Rayleigh... | cond-mat_quant-gas |
Low-Dimensional Fluctuations and Pseudogap in Gaudin-Yang Fermi Gases: Pseudogap is a ubiquitous phenomenon in strongly correlated systems such as
high-$T_{\rm c}$ superconductors, ultracold atoms and nuclear physics. While
pairing fluctuations inducing the pseudogap are known to be enhanced in
low-dimensional systems,... | cond-mat_quant-gas |
Quantum filaments in dipolar Bose-Einstein condensates: Collapse in dipolar Bose-Einstein condensates may be arrested by quantum
fluctuations. Due to the anisotropy of the dipole-dipole interactions, the
dipole-driven collapse induced by soft excitations is compensated by the
repulsive Lee-Huang-Yang contribution resul... | cond-mat_quant-gas |
Anisotropic superfluidity in a dipolar Bose gas: We study the superfluid character of a dipolar Bose-Einstein condensate
(DBEC) in a quasi-two dimensional (q2D) geometry. In particular, we allow for
the dipole polarization to have some non-zero projection into the plane of the
condensate so that the effective interacti... | cond-mat_quant-gas |
Relaxation of superfluid turbulence in highly oblate Bose-Einstein
condensates: We investigate thermal relaxation of superfluid turbulence in a highly oblate
Bose-Einstein condensate. We generate turbulent flow in the condensate by
sweeping the center region of the condensate with a repulsive optical
potential. The t... | cond-mat_quant-gas |
Observation of Zitterbewegung in a spin-orbit coupled Bose-Einstein
condensate: Spin-orbit coupled ultra-cold atoms provide an intriguing new avenue for the
study of rich spin dynamics in superfluids. In this Letter, we observe
Zitterbewegung, the simultaneous velocity (thus position) and spin
oscillations, of neutra... | cond-mat_quant-gas |
Supersolid Gap Soliton in a Bose-Einstein Condensate and Optical Ring
Cavity coupling system: The system of a transversely pumped Bose-Einstein condensate (BEC) coupled to
a lossy ring cavity can favor a supersolid steady state. Here we find the
existence of supersolid gap soliton in such a driven-dissipative system.... | cond-mat_quant-gas |
Effective theory for the propagation of a wave-packet in a disordered
and nonlinear medium: The propagation of a wave-packet in a nonlinear disordered medium exhibits
interesting dynamics. Here, we present an analysis based on the nonlinear
Schr\"odinger equation (Gross-Pitaevskii equation). This problem is directly
... | cond-mat_quant-gas |
Prethermalization and universal dynamics in near-integrable quantum
systems: We review the recent progress in the understanding of the relaxation of
isolated near-integrable quantum many-body systems. Focusing on
prethermalization and universal dynamics following a quench, we describe the
experiments with ultracold a... | cond-mat_quant-gas |
Two-mode dipolar bosonic junctions: We consider a two-mode atomic Josephson junction realized with dilute dipolar
bosons confined by a double-well. We employ the two-site extended Bose-Hubbard
Hamiltonian and characterize the ground-state of this system by the Fisher
information, coherence visibility, and entanglement ... | cond-mat_quant-gas |
An effective-field-theory analysis of Efimov physics in heteronuclear
mixtures of ultracold atomic gases: We use an effective-field-theory framework to analyze the Efimov effect in
heteronuclear three-body systems consisting of two species of atoms with a
large interspecies scattering length. In the leading-order des... | cond-mat_quant-gas |
Visualising Berry phase and diabolical points in a quantum
exciton-polariton billiard: Diabolical points (degeneracies) can naturally occur in spectra of
two-dimensional quantum systems and classical wave resonators due to simple
symmetries. Geometric Berry phase is associated with these spectral
degeneracies. Here, ... | cond-mat_quant-gas |
Realization of a fractional quantum Hall state with ultracold atoms: Strongly interacting topological matter exhibits fundamentally new phenomena
with potential applications in quantum information technology. Emblematic
instances are fractional quantum Hall states, where the interplay of magnetic
fields and strong inte... | cond-mat_quant-gas |
Monitoring squeezed collective modes of a one-dimensional Bose gas after
an interaction quench using density ripples analysis: We investigate the out-of-equilibrium dynamics following a sudden quench of
the interaction strength, in a one-dimensional quasi-condensate trapped at the
surface of an atom chip. Within a li... | cond-mat_quant-gas |
Breathing mode frequency of a strongly interacting Fermi gas across the
2D-3D dimensional crossover: We address the interplay between dimension and quantum anomaly on the
breathing mode frequency of a strongly interacting Fermi gas harmonically
trapped at zero temperature. Using a beyond mean-field, Gaussian pair
flu... | cond-mat_quant-gas |
Comment on "On the relations between large-scale models of superfluid
helium-4" [Phys. Fluids 33, 127124 (2021]": We comment on the paper by M. S\'ykora, M. Pavelka, M. La Mantia, D. Jou, and
M. Grmela "On the relations between large-scale models of superfluid helium-4,"
Physics of Fluids, 33(12):127124(2021), where ... | cond-mat_quant-gas |
On quantum time crystals and interacting gauge theories in atomic
Bose-Einstein condensates: We study the dynamics of a Bose-Einstein condensate trapped circumferentially
on a ring, and which is governed by an interacting gauge theory. We show that
the associated density-dependent gauge potential and concomitant curr... | cond-mat_quant-gas |
Spectroscopy of edge and bulk collective modes in fractional Chern
insulators: The exploration of atomic fractional quantum Hall (FQH) states is now within
reach in optical-lattice experiments. While ground-state signatures have been
observed in a system realizing the Hofstadter-Bose-Hubbard model in a box
[Leonard e... | cond-mat_quant-gas |
Resistive flow in a weakly interacting Bose-Einstein condensate: We report the direct observation of resistive flow through a weak link in a
weakly interacting atomic Bose-Einstein condensate. Two weak links separate our
ring-shaped superfluid atomtronic circuit into two distinct regions, a source
and a drain. Motion o... | cond-mat_quant-gas |
Quantitative test of mean-field description of a trapped two-dimensional
Bose gas: We investigate the accuracy of two mean-field theories of the trapped
two-dimensional Bose gas at predicting transition region properties by
comparison to non-perturbative classical field calculations. To make these
comparisons we exam... | cond-mat_quant-gas |
Optomechanically-Based Probing of Spin-Charge Separation in Ultracold
Gases: We propose a new approach to investigate the spin-charge separation in 1D
quantum liquids via the optomechanical coupled atom-cavity system. We show
that, one can realize an effective two-modes optomechanical model with the
spin/charge modes... | cond-mat_quant-gas |
Short range asymptotic behavior of the wave-functions of interacting
spin-half fermionic atoms with spin-orbit coupling: a model study: We consider spin-half fermionic atoms with isotropic Rashba spin-orbit
coupling in three directions. The interatomic potential is modeled by a square
well potential. We derive the an... | cond-mat_quant-gas |
Versatile electric fields for the manipulation of ultracold NaK
molecules: In this paper, we present an electrode geometry for the manipulation of
ultracold rovibrational ground state NaK molecules. The electrode system allows
to induce a dipole moment in trapped diatomic NaK molecules with a magnitude up
to $68 \%$ ... | cond-mat_quant-gas |
General memory kernels and further corrections to the variational path
integral approach for the Bogoliubov-Fröhlich Hamiltonian: The celebrated variational path integral approach to the polaron problem
shows remarkable discrepancies with diagrammatic Monte Carlo for the
Bogoliubov-Fr\"{o}hlich Hamiltonian which desc... | cond-mat_quant-gas |
Measurement of the atom number distribution in an optical tweezer using
single photon counting: We demonstrate in this paper a method to reconstruct the atom number
distribution of a cloud containing a few tens of cold atoms. The atoms are
first loaded from a magneto-optical trap into a microscopic optical dipole tra... | cond-mat_quant-gas |
Geometrically induced complex tunnelings for ultracold atoms carrying
orbital angular momentum: We investigate the dynamics of angular momentum states for a single ultracold
atom trapped in two dimensional systems of sided coupled ring potentials. The
symmetries of the system show that tunneling amplitudes between di... | cond-mat_quant-gas |
Two-mode dipolar bosonic junctions: We consider a two-mode atomic Josephson junction realized with dilute dipolar
bosons confined by a double-well. We employ the two-site extended Bose-Hubbard
Hamiltonian and characterize the ground-state of this system by the Fisher
information, coherence visibility, and entanglement ... | cond-mat_quant-gas |
Phase diagrams and Thomas-Fermi estimates for spin-orbit coupled
Bose-Einstein Condensates under rotation: We provide complete phase diagrams describing the ground state of a trapped
spinor BEC under the combined effects of rotation and a Rashba spin-orbit
coupling. The interplay between the different parameters (mag... | cond-mat_quant-gas |
Bose-Einstein condensates in toroidal traps: instabilities, swallow-tail
loops, and self-trapping: We study the stability and dynamics of an ultra-cold bosonic gas trapped in a
toroidal geometry and driven by rotation, in the absence of dissipation. We
first delineate, via the Bogoliubov mode expansion, the regions o... | cond-mat_quant-gas |
Contour-time approach to the disordered Bose-Hubbard model in the strong
coupling regime: There has been considerable interest in the disordered Bose Hubbard model
(BHM) in recent years, particularly in the context of thermalization and
many-body localization. We develop a two-particle irreducible (2PI)
strong-coupli... | cond-mat_quant-gas |
Spin-Orbit Coupled One-Dimensional Fermi Gases with Infinite Repulsion: The current efforts of studying many-body effects with spin-orbit coupling
(SOC) using alkali-metal atoms are impeded by the heating effects due to
spontaneous emission. Here, we show that even for SOCs too weak to cause any
heating, dramatic many-... | cond-mat_quant-gas |
Quantum phase transitions of the spin-boson model within
multi-coherent-states: A variational approach based on the multi-coherent-state ansatz with
asymmetric parameters is employed to study the ground state of the spin-boson
model. Without any artificial approximations except for the finite number of
the coherent s... | cond-mat_quant-gas |
Observable Vortex Properties in Finite Temperature Bose Gases: We study the dynamics of vortices in finite temperature atomic Bose-Einstein
condensates, focussing on decay rates, precession frequencies and core
brightness, motivated by a recent experiment (Freilich et al. Science 329, 1182
(2010)) in which real-time dy... | cond-mat_quant-gas |
Complex Langevin simulation of quantum vortices in a Bose-Einstein
condensate: The ab-initio simulation of quantum vortices in a Bose-Einstein condensate is
performed by adopting the complex Langevin techniques. We simulate the
nonrelativistic boson field theory at finite chemical potential under rotation.
In the sup... | cond-mat_quant-gas |
Materia cuántica y dinámica por mediciones: This article discusses some details of the course on "Quantum matter and
measurement induced dynamics" given in the Summer School of Physics XXIX at
UNAM in 2022. The notes describe useful concepts to study the dynamics induced
by photon losses, the method for simulation (qua... | cond-mat_quant-gas |
Localization-delocalization transition of dipolar bosons in a four-well
potential: We study interacting dipolar atomic bosons in a four-well potential within a
ring geometry and outline how a four-site Bose-Hubbard (BH) model including
next-nearest-neighbor interaction terms can be derived for the above four-well
sys... | cond-mat_quant-gas |
Fractionalization Waves in Two-dimensional Dirac Fermions: Quantum
Imprint from One Dimension: Particle fractionalization is believed to orchestrate the physics of many
strongly correlated systems, yet its direct experimental detection remains a
challenge. We propose a simple measurement for an ultracold matter syste... | cond-mat_quant-gas |
Sagnac Interferometry Using Bright Matter-Wave Solitons: We use an effective one-dimensional Gross-Pitaevskii equation to study bright
matter-wave solitons held in a tightly confining toroidal trapping potential,
in a rotating frame of reference, as they are split and recombined on narrow
barrier potentials. In particu... | cond-mat_quant-gas |
Thermodynamics of the two-component Fermi gas with unequal masses at
unitarity: We consider mass-imbalanced two-component Fermi gases for which the
unequal-mass atoms interact via a zero-range model potential with a diverging
s-wave scattering length $a_s$, i.e., with $1/a_s=0$. The high temperature
thermodynamics of... | cond-mat_quant-gas |
Energy bands and Landau levels of ultracold fermions in the bilayer
honeycomb optical lattice: We investigate the spectrum and eigenstates of ultracold fermionic atoms in
the bilayer honeycomb optical lattice. In the low energy approximation, the
dispersion relation has parabolic form and the quasiparticles are chira... | cond-mat_quant-gas |
Properties of a Bose Gas in the Presence of Disorder (Laurea thesis): The phenomenon of Bose-Einstein condensation and superfluidity in a Bose gas
with disorder is investigated. Diffusion Monte Carlo (DMC) method is used to
calculate superfluid and condensate fraction of the system as a function of
density and strength... | cond-mat_quant-gas |
Thermodynamics and static response of anomalous 1D fermions via quantum
Monte Carlo in the worldline representation: A system of three-species fermions in one spatial dimension (1D) with a
contact three-body interaction is known to display a scale anomaly. This
anomaly is identical to that of a two-dimensional (2D) s... | cond-mat_quant-gas |
Using off-diagonal confinement as a cooling method: In a recent letter [Phys. Rev. Lett. 104, 167201 (2010)] we proposed a new
confining method for ultracold atoms on optical lattices, based on off-diagonal
confinement (ODC). This method was shown to have distinct advantages over the
conventional diagonal confinement (... | cond-mat_quant-gas |
Realizing and optimizing an atomtronic SQUID: We demonstrate how a toroidal Bose-Einstein condensate with a movable barrier
can be used to realize an atomtronic SQUID. The magnitude of the barrier
height, which creates the analogue of an SNS junction, is of crucial
importance, as well as its ramp-up and -down protocol.... | cond-mat_quant-gas |
Exact dynamics of two holes in two-leg antiferromagnetic ladders: We study the motion of holes in a mixed-dimensional setup of an
antiferromagnetic ladder, featuring nearest neighbor hopping $t$ along the
ladders and Ising-type spin interactions along, $J_\parallel$, and across,
$J_\perp$, the ladder. We determine exac... | cond-mat_quant-gas |
Topological Phase Diagram of Optimally Shaken Honeycomb Lattices: A Dual
Perspective from Stroboscopic and Non-Stroboscopic Floquet Hamiltonians: We present a direct comparison between the stroboscopic and non-stroboscopic
effective approaches for ultracold atoms in shaken honeycomb lattices, focusing
specifically on... | cond-mat_quant-gas |
Spatial correlation of two-dimensional Bosonic multi-mode condensates: We studied the spatial coherence of a Bosonic two-dimensional multi-mode
condensate both through measurements and simulations. It is shown that
condensates with a constant spatial density must be described as the
superposition of several quantized m... | cond-mat_quant-gas |
Noise-induced transition from superfluid to vortex state in
two-dimensional nonequilibrium polariton condensates: We study the Berezinskii-Kosterlitz-Thouless mechanism for vortex-antivortex
pair formation in two-dimensional superfluids for nonequilibrium condensates.
Our numerical study is based on a classical field... | cond-mat_quant-gas |
Ion induced density bubble in a strongly correlated one dimensional gas: We consider a harmonically trapped Tonks-Girardeau gas of impenetrable bosons
in the presence of a single embedded ion, which is assumed to be tightly
confined in a RF trap. In an ultracold ion-atom collision the ion's charge
induces an electric d... | cond-mat_quant-gas |
Reaction kinetics of ultracold molecule-molecule collisions: Studying chemical reactions on a state-to-state level tests and improves our
fundamental understanding of chemical processes. For such investigations it is
convenient to make use of ultracold atomic and molecular reactants as they can
be prepared in well defi... | cond-mat_quant-gas |
Super Efimov effect for mass-imbalanced systems: We study two species of particles in two dimensions interacting by isotropic
short-range potentials with the interspecies potential fine-tuned to a p-wave
resonance. Their universal low-energy physics can be extracted by analyzing a
properly constructed low-energy effect... | cond-mat_quant-gas |
Quantized Adiabatic Transport in Momentum Space: Though topological aspects of energy bands are known to play a key role in
quantum transport in solid-state systems, the implications of Floquet band
topology for transport in momentum space (i.e., acceleration) are not explored
so far. Using a ratchet accelerator model ... | cond-mat_quant-gas |
Many-body interferometry of a Rydberg-dressed spin lattice: Ultracold atoms are an ideal platform to study strongly correlated phases of
matter in and out of equilibrium. Much of the experimental progress in this
field crucially relies on the control of the contact interaction between two
atoms. Control of strong long-... | cond-mat_quant-gas |
Quasiadiabatic dynamics of ultracold bosonic atoms in a one-dimensional
optical superlattice: We study the quasiadiabatic dynamics of a one-dimensional system of ultracold
bosonic atoms loaded in an optical superlattice. Focusing on a slow linear
variation in time of the superlattice potential, the system is driven f... | cond-mat_quant-gas |
Probing ultracold Fermi gases with light-induced gauge potentials: We theoretically investigate the response of a two component Fermi gas to
vector potentials which couple separately to the two spin components. Such
vector potentials may be implemented in ultracold atomic gases using optically
dressed states. Our study... | cond-mat_quant-gas |
Using dark solitons from a Bose-Einstein condensate necklace to imprint
soliton states in the spectral memory of a free boson gas: A possible use of matter-wave dark-soliton crystal produced by a
Bose-Einstein condensate with ring geometry, to store soliton states in the
quantum memory of a free boson gas, is explore... | cond-mat_quant-gas |
Molecular state in a spin-orbital-angular-momentum coupled Fermi gas: We study the two-body bound states in a spin-orbital-angular-momentum (SOAM)
coupled quantum gas of fermions. Two different configurations are considered:
an attractive $s$-wave interaction exists between two spin species that are
SOAM coupled; and a... | cond-mat_quant-gas |
Dimensional crossover and cold-atom realization of topological Mott
insulators: We propose a cold-atom setup which allows for a dimensional crossover from a
two-dimensional quantum spin Hall insulating phase to a three-dimensional
strong topological insulator by tuning the hopping between the layers. We
further show ... | cond-mat_quant-gas |
Propagation of collective pair excitations in disordered Bose
superfluids: We study the effect of disorder on the propagation of collective excitations
in a disordered Bose superfluid. We incorporate local density depletion induced
by strong disorder at the meanfield level, and formulate the transport of the
excitati... | cond-mat_quant-gas |
Efimov three-body states on top of a Fermi sea: The stabilization of Cooper pairs of bound electrons in the background of a
Fermi sea is the origin of superconductivity and the paradigmatic example of
the striking influence of many-body physics on few-body properties. In the
quantum-mechanical three-body problem the fa... | cond-mat_quant-gas |
The two-state Bose-Hubbard model in the hard-core boson limit:
Non-ergodicity and the Bose-Einstein condensation: The Bose-Einstein condensation in the hard-core boson limit (HCB) of the
Bose-Hubbard model with two local states and the particle hopping in the
excited band only is investigated. For the purpose of cons... | cond-mat_quant-gas |
Correlation energy of a homogeneous dipolar Fermi gas: We study the normal state of a 3-$d$ homogeneous dipolar Fermi gas beyond the
Hartree-Fock approximation. The correlation energy is found of the same order
as the Fock energy, unusually strong for a Fermi-liquid system. As a result,
the critical density of mechanic... | cond-mat_quant-gas |
Long time non-equilibrium dynamics of binary Bose condensates: We explore the out-of-equilibrium temporal dynamics of demixing and phase
separation in a two dimensional binary Bose fluid at zero temperature,
following a sudden quench across the miscible-immiscible phase boundary. On
short timescales, the system rapidly... | cond-mat_quant-gas |
Extended Bose-Hubbard models with Rydberg macrodimer dressing: Extended Hubbard models have proven to bear novel quantum states, but their
experimental realization remains challenging. In this work we propose to use
bosonic quantum gases dressed with molecular bound states in Rydberg
interaction potentials for the obse... | cond-mat_quant-gas |
Superfluidity in the 1D Bose-Hubbard Model: We study superfluidity in the 1D Bose-Hubbard model using a variational
matrix product state technique. We determine the superfluid density as a
function of the Hubbard parameters by calculating the energy cost of phase
twists in the thermodynamic limit. As the system is crit... | cond-mat_quant-gas |
Continuous atom laser with Bose-Einstein condensates involving
three-body interactions: We demonstrate, through numerical simulations, the emission of a coherent
continuous matter wave of constant amplitude from a Bose-Einstein Condensate in
a shallow optical dipole trap. The process is achieved by spatial control of... | cond-mat_quant-gas |
Hartree-Fock treatment of Fermi polarons using the Lee-Low-Pine
transformation: We consider the Fermi polaron problem at zero temperature, where a single
impurity interacts with non-interacting host fermions. We approach the problem
starting with a Frohlich-like Hamiltonian where the impurity is described with
canoni... | cond-mat_quant-gas |
Twisted complex superfluids in optical lattices: We show that correlated pair tunneling drives a phase transition to a twisted
superfluid with a complex order parameter. This unconventional superfluid phase
spontaneously breaks the time-reversal symmetry and is characterized by a
twisting of the complex phase angle bet... | cond-mat_quant-gas |
Squeezing in driven bimodal Bose-Einstein Condensates: Erratic driving
versus noise: We study the interplay of squeezing and phase randomization near the
hyperbolic instability of a two-site Bose-Hubbard model in the Josephson
interaction regime. We obtain results for the quantum Zeno suppression of
squeezing, far be... | cond-mat_quant-gas |
Self-trapped quantum balls in binary Bose-Einstein condensates: We study the formation of a stable self-trapped spherical quantum ball in a
binary Bose-Einstein condensate (BEC) with two-body inter-species attraction
and intra-species repulsion employing the beyond-mean-field Lee-Huang-Yang and
the three-body interacti... | cond-mat_quant-gas |
$F$-wave pairing of cold atoms in optical lattices: The tremendous development of cold atom physics has opened up a whole new
opportunity to study novel states of matter which are not easily accessible in
solid state systems. Here we propose to realize the $f$-wave pairing
superfluidity of spinless fermions in the $p_{... | cond-mat_quant-gas |
Interplay between temperature and trap effects in one-dimensional
lattice systems of bosonic particles: We investigate the interplay of temperature and trap effects in cold particle
systems at their quantum critical regime, such as cold bosonic atoms in optical
lattices at the transitions between Mott-insulator and s... | cond-mat_quant-gas |
Supersolid Phase of Cold Fermionic Polar Molecules in 2D Optical
Lattices: We study a system of ultra-cold fermionic polar molecules in a
two-dimensional square lattice interacting via both the long-ranged
dipole-dipole interaction and a short-ranged on-site attractive interaction.
Singlet superfluid, charge density ... | cond-mat_quant-gas |
Many-body braiding phases in a rotating strongly correlated photon gas: We present a theoretical study of a rotating trapped photon gas where a
Laguerre-Gauss laser pump with a non-zero orbital angular momentum is used to
inject rotating photons into a cavity with strong optical nonlinearity. The
Laughlin-like few-phot... | cond-mat_quant-gas |
Collective behaviour of large number of vortices in the plane: We investigate the dynamics of $N$ point vortices in the plane, in the limit
of large $N$. We consider {\em relative equilibria}, which are rigidly rotating
lattice-like configurations of vortices. These configurations were observed in
several recent experi... | cond-mat_quant-gas |
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