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Driven-dissipative Ising model: Dynamical crossover at weak dissipation: Driven quantum systems coupled to an environment typically exhibit
effectively thermal behavior with relaxational dynamics near criticality.
However, a different qualitative behavior might be expected in the weakly
dissipative limit due to the com... | cond-mat_quant-gas |
Quasi-one-dimensional flow of polariton condensate past an obstacle: Nonlinear wave patterns generated by the flow of polariton condensate past an
obstacle are studied for quasi-one-dimensional microcavity geometry. It is
shown that pumping and nonlinear damping play a crucial role in this process
leading to sharp diff... | cond-mat_quant-gas |
Staggered superfluid phases of dipolar bosons in two-dimensional square
lattices: We study the quantum ground state of ultracold bosons in a two-dimensional
square lattice. The bosons interact via the repulsive dipolar interactions and
s-wave scattering. The dynamics is described by the extended Bose-Hubbard model
in... | cond-mat_quant-gas |
BCS-BCS crossover between atomic and molecular superfluids in a
Bose-Fermi mixture: We theoretically examine a continuity between atomic and molecular Fermi
superfluids in a Bose-Fermi mixture near the Feshbach resonance. Considering a
two-channel model describing the Feshbach resonance between Fermi and Bose
atoms, ... | cond-mat_quant-gas |
Fulde-Ferrell superfluids in spinless ultracold Fermi gases: The Fulde-Ferrell (FF) superfluid phase, in which fermions form
finite-momentum Cooper pairings, is well studied in spin-singlet superfluids in
past decades. Different from previous works that engineer the FF state in
spinful cold atoms, we show that the FF s... | cond-mat_quant-gas |
Reply to the correspondence of Drummond and Brand [arXiv:1610.07633]: In their correspondence [arXiv:1610.07633] Drummond and Brand criticize our
work [Nature Physics 12, 451-454 (2016) http://dx.doi.org/10.1038/nphys3631].
We show that their criticism is misleading and unfounded. | cond-mat_quant-gas |
Dynamics of Uniform Quantum Gases, I: Density and Current Correlations: A unified approach valid for any wavenumber, frequency, and temperature is
presented for uniform ideal quantum gases allowing for a comprehensive study of
number density and particle-current density response functions. Exact
analytical expressions ... | cond-mat_quant-gas |
A long-lived Higgs mode in a two-dimensional confined Fermi gas: The Higgs mode corresponds to the collective motion of particles due to the
vibrations of an invisible field. It plays a fundamental role for our
understanding of both low and high energy physics, giving elementary particles
their mass and leading to coll... | cond-mat_quant-gas |
Critical Dynamics of a Two-dimensional Superfluid near a Non-Thermal
Fixed Point: Critical dynamics of an ultracold Bose gas far from equilibrium is studied in
two spatial dimensions. Superfluid turbulence is created by quenching the
equilibrium state close to zero temperature. Instead of immediately
re-thermalizing,... | cond-mat_quant-gas |
A superfluid-droplet crystal and a free-space supersolid in a
dipole-blockaded gas: A novel supersolid phase is predicted for an ensemble of Rydberg atoms in the
dipole-blockade regime, interacting via a repulsive dipolar potential
"softened" at short distances. Using exact numerical techniques, we study the
low temp... | cond-mat_quant-gas |
Atom chips with free-standing two-dimensional electron gases: advantages
and challenges: In this work we consider the advantages and challenges of using free-standing
two-dimensional electron gases (2DEG) as active components in atom chips for
manipulating ultracold ensembles of alkali atoms. We calculate trapping
pa... | cond-mat_quant-gas |
Supersolid and charge density-wave states from anisotropic interaction
in an optical lattice: We show anisotropy of the dipole interaction between magnetic atoms or polar
molecules can stabilize new quantum phases in an optical lattice. Using a well
controlled numerical method based on the tensor network algorithm, w... | cond-mat_quant-gas |
Bound states in a quasi-two-dimensional Fermi gas: We consider the problem of N identical fermions of mass M and one
distinguishable particle of mass m interacting via short-range interactions in
a confined quasi-two-dimensional (quasi-2D) geometry. For N=2 and mass ratios
M/m<13.6, we find non-Efimov trimers that smoo... | cond-mat_quant-gas |
Collective excitations in two-dimensional harmonically trapped quantum
droplets: The collective excitation modes in quantum droplets trapped in a
two-dimensional harmonic potential in the context of symmetric weakly
interacting binary bosonic mixtures are studied. By utilizing the linearization
technique, the time-de... | cond-mat_quant-gas |
Loosely Bound Few-Body States in a Spin-1 Gas with Near-Degenerate
Continua: A distinguishing feature of ultracold collisions of bosonic lithium atoms is
the presence of two near-degenerate two-body continua. The influence of such a
near-degeneracy on the few-body physics in the vicinity of a narrow Feshbach
resonanc... | cond-mat_quant-gas |
Quantum vortex instability and black hole superradiance: Vortices and black holes set the scene for many interesting dynamical
processes in physics. Here, we study the dynamical instability of quantised
vortices and rotational superradiance around rotating black holes, illustrating
in the process that the same physics ... | cond-mat_quant-gas |
An exact formalism for the quench dynamics of integrable models: We describe a formulation for studying the quench dynamics of integrable
systems generalizing an approach by Yudson. We study the evolution of the
Lieb-Liniger model, a gas of interacting bosons moving on the continuous
infinite line and interacting via a... | cond-mat_quant-gas |
Open source Matrix Product States: Opening ways to simulate entangled
many-body quantum systems in one dimension: Numerical simulations are a powerful tool to study quantum systems beyond
exactly solvable systems lacking an analytic expression. For one-dimensional
entangled quantum systems, tensor network methods, am... | cond-mat_quant-gas |
Thermalization and Bose-Einstein condensation of quantum light in bulk
nonlinear media: We study the thermalization and the Bose-Einstein condensation of a paraxial,
spectrally narrow beam of quantum light propagating in a lossless bulk Kerr
medium. The spatiotemporal evolution of the quantum optical field is ruled b... | cond-mat_quant-gas |
Unitary $p$-wave Fermi gas in one dimension: We elucidate universal many-body properties of a one-dimensional,
two-component ultracold Fermi gas near the $p$-wave Feshbach resonance. The
low-energy scattering in this system can be characterized by two parameters,
that is, $p$-wave scattering length and effective range.... | cond-mat_quant-gas |
Spatial separation of rotating binary Bose-Einstein condensate by tuning
the dipolar interactions: We are pointing out relevant anisotropic effects, related to spatial
separation, miscibility and mass-symmetry, due to dipole-dipole interactions in
rotating binary dipolar Bose-Einstein condensates, by considering symm... | cond-mat_quant-gas |
Spectrum of elementary excitations in Galilean-invariant integrable
models: The spectrum of elementary excitations in one-dimensional quantum liquids is
generically linear at low momenta. It is characterized by the sound velocity
that can be related to the ground state energy. Here we study the spectrum at
higher mom... | cond-mat_quant-gas |
Dynamics of polar-core spin vortices in a ferromagnetic spin-1
Bose-Einstein condensate: A ferromagnetic spin-1 condensate supports polar-core spin vortices (PCVs) in
the easy-plane phase. We derive a model for the dynamics of these PCVs using a
variational Lagrangian approach. The PCVs behave as massive charged part... | cond-mat_quant-gas |
Cooperative scattering measurement of coherence in a spatially modulated
Bose gas: Correlations of a Bose gas released from an optical lattice are measured
using superradiant scattering. Conditions are chosen so that after initial
incident light pumping at the Bragg angle for diffraction, due to matter wave
amplifica... | cond-mat_quant-gas |
Light-cone effect and supersonic correlations in one- and
two-dimensional bosonic superfluids: We study the spreading of density-density correlations in Bose-Hubbard models
after a quench of the interaction strength, using time-dependent variational
Monte Carlo simulations. It gives access to unprecedented long propa... | cond-mat_quant-gas |
Two- and one-dimensional gap solitons in spin-orbit-coupled systems with
Zeeman splitting: We elaborate a mechanism for the formation of stable solitons of the
semi-vortex type (with vorticities 0 and 1 in their two components), populating
a finite bandgap in the spectrum of the spin-orbit-coupled binary Bose-Einstei... | cond-mat_quant-gas |
A Quantum Gas Microscope for Fermionic Atoms: Strongly interacting fermions define the properties of complex matter at all
densities, from atomic nuclei to modern solid state materials and neutron
stars. Ultracold atomic Fermi gases have emerged as a pristine platform for the
study of many-fermion systems. Here we real... | cond-mat_quant-gas |
Efimovian three-body potential from broad to narrow Feshbach resonances: We analyse the change in the hyperradial Efimovian three-body potential as
the two-body interaction is tuned from the broad to narrow Feshbach resonance
regime. Here, it is known from both theory and experiment that the three-body
dissociation sca... | cond-mat_quant-gas |
Many-body Dynamics with Time-dependent Interaction: Recent advances in optical Feshbach resonance technique have enabled the
experimental investigation of atomic gases with time-dependent interaction. In
this work, we study the many-body dynamics of weakly interacting bosons subject
with an arbitrary time varying scatt... | cond-mat_quant-gas |
Dynamical Zeeman resonance in spin-orbit-coupled spin-1 Bose gases: We predict a dynamical resonant effect, which is driven by externally applied
linear and quadratic Zeeman fields, in a spin-orbit-coupled spin-1
Bose-Einstein condensate. The Bose-Einstein condensate is assumed to be
initialized in some superposed stat... | cond-mat_quant-gas |
Entanglement structure of a quantum simulator: the two-component
Bose-Hubbard model: We consider a quantum simulator of the Heisenberg chain with ferromagnetic
interactions based on the two-component 1D Bose-Hubbard model at filling equal
to two in the strong coupling regime. The entanglement properties of the ground... | cond-mat_quant-gas |
Finite-momentum Bose-Einstein condensates in shaken 2D square optical
lattices: We consider ultracold bosons in a 2D square optical lattice described by the
Bose-Hubbard model. In addition, an external time-dependent sinusoidal force is
applied to the system, which shakes the lattice along one of the diagonals. The
e... | cond-mat_quant-gas |
Nonequilibrium Phase Diagram of a Driven-Dissipative Many-Body System: We study the nonequilibrium dynamics of a many-body bosonic system on a
lattice, subject to driving and dissipation. The time-evolution is described by
a master equation, which we treat within a generalized Gutzwiller mean field
approximation for de... | cond-mat_quant-gas |
Cooling and Near-equilibrium Dynamics of Atomic Gases Across the
Superfluid-Mott Insulator Transition: We study near-equilibrium thermodynamics of bosonic atoms in a
two-dimensional optical lattice by ramping up the lattice depth to convert a
superfluid into an inhomogeneous mixture of superfluid and Mott insulator.
... | cond-mat_quant-gas |
Pi-phases in balanced fermionic superfluids on spin-dependent optical
lattices: We study a balanced two-component system of ultracold fermions in one
dimension with attractive interactions and subject to a spin-dependent optical
lattice potential of opposite sign for the two components. We find states with
different ... | cond-mat_quant-gas |
Dipolar dark solitons: We numerically generate, and then study the basic properties of dark
soliton-like excitations in a dipolar gas confined in a quasi one dimensional
trap. These excitations, although very similar to dark solitons in a gas with
contact interaction, interact with each other and can form bound states.... | cond-mat_quant-gas |
Entanglement spectrum and quantum phase diagram of the long-range XXZ
chain: Entanglement is a central feature of many-body quantum systems and plays a
unique role in quantum phase transitions.
In many cases, the entanglement spectrum, which represents the spectrum of
the density matrix of a bipartite system, conta... | cond-mat_quant-gas |
Transition between vacuum and finite-density states in the
infinite-dimensional Bose-Hubbard model with spatially inhomogeneous
dissipation: We analyze dynamics of the infinite-dimensional Bose-Hubbard model with
spatially inhomogeneous dissipation in the hardcore boson limit by solving the
Lindblad master equation... | cond-mat_quant-gas |
Non-degenerate Bound State Solitons in Multi-component Bose-Einstein
Condensates: We investigate non-degenerate bound state solitons systematically in
multi-component Bose-Einstein condensates, through developing Darboux
transformation method to derive exact soliton solutions analytically. In
particular, we show that... | cond-mat_quant-gas |
Dynamics of polar-core spin vortices in a ferromagnetic spin-1
Bose-Einstein condensate: A ferromagnetic spin-1 condensate supports polar-core spin vortices (PCVs) in
the easy-plane phase. We derive a model for the dynamics of these PCVs using a
variational Lagrangian approach. The PCVs behave as massive charged part... | cond-mat_quant-gas |
Site-resolved imaging of a fermionic Mott insulator: The complexity of quantum many-body systems originates from the interplay of
strong interactions, quantum statistics, and the large number of
quantum-mechanical degrees of freedom. Probing these systems on a microscopic
level with single-site resolution offers import... | cond-mat_quant-gas |
Weyl points and topological nodal superfluids in a face-centered cubic
optical lattice: We point out that a face-centered cubic (FCC) optical lattice, which can be
realised by a simple scheme using three lasers, provides one a highly
controllable platform for creating Weyl points and topological nodal
superfluids in ... | cond-mat_quant-gas |
Comment on: `Single-shot simulations of dynamic quantum many-body
systems' [arXiv:1501.03224]: In their recent paper [Nature Physics 15, 451 (2006)], Sakmann and Kasevich
study the formation of fringe patterns in ultra-cold Bose gases and claim:
`Here, we show how single shots can be simulated from numerical solution... | cond-mat_quant-gas |
Tuning photon-mediated interactions in a multimode cavity: from
supersolid to insulating droplets hosting phononic excitations: Ultracold atoms trapped in laser-generated optical lattices serve as a
versatile platform for quantum simulations. However, as these lattices are
infinitely stiff, they do not allow to emula... | cond-mat_quant-gas |
Dark soliton oscillations in Bose-Einstein condensates with multi-body
interactions: We consider the dynamics of dark matter solitons moving through non-uniform
cigar-shaped Bose-Einstein condensates described by the mean field
Gross-Pitaevskii equation with generalized nonlinearities, in the case when the
condition ... | cond-mat_quant-gas |
A Renormalization-Group Study of Interacting Bose-Einstein Condensates:
II. Anomalous Dimension $η$ for $d\lesssim 4$ at Finite Temperatures: We study the anomalous dimension $\eta$ of homogeneous interacting
single-component Bose-Einstein condensates at finite temperatures for
$d\lesssim 4$ dimensions. This $\eta$ i... | cond-mat_quant-gas |
Quasi-one-dimensional spin-orbit- and Rabi-coupled bright dipolar
Bose-Einstein-condensate solitons: We study the formation of stable bright solitons in quasi-one-dimensional
(quasi-1D) spin-orbit- (SO-) and Rabi-coupled two pseudospinor dipolar
Bose-Einstein condensates (BECs) of 164 Dy atoms in the presence of repu... | cond-mat_quant-gas |
Transition state theory for wave packet dynamics. II. Thermal decay of
Bose-Einstein condensates with long-range interaction: We apply transition state theory to coupled Gaussian wave packets and
calculate thermal decay rates of Bose-Einstein condensates with additional
long-range interaction. The ground state of suc... | cond-mat_quant-gas |
Many-particle Quantum Hydrodynamics of Spin-1 Bose-Einstein Condensates: We develop a novel model of the magnetized spin-1 Bose-Einstein condensate
(BEC) of neutral atoms, using the method of many-particle quantum hydrodynamic
(QHD) and propose an original derivation of the system of continual equations.
We consider bo... | cond-mat_quant-gas |
Interference dynamics of matter-waves of SU($N$) fermions: We analyze the two main physical observables related to the momenta of
strongly correlated SU($N$) fermions in ring-shaped lattices pierced by an
effective magnetic flux: homodyne (momentum distribution) and self-heterodyne
interference patterns. We demonstrate... | cond-mat_quant-gas |
Counter-propagating edge modes and topological phases of a kicked
quantum Hall system: A periodically driven quantum Hall system in a fixed magnetic field is found
to exhibit a series of phases featuring anomalous edge modes with the "wrong"
chirality. This leads to pairs of counter-propagating chiral edge modes at e... | cond-mat_quant-gas |
Mesoscopic quantum switching of a Bose-Einstein condensate in an optical
lattice governed by the parity of the number of atoms: It is shown that for a $N$-boson system the parity of $N$ can be responsible
for a qualitative difference in the system response to variation of a
parameter. The nonlinear boson model is con... | cond-mat_quant-gas |
Breaking of Goldstone modes in two component Bose-Einstein condensate: We study the decay rate $\Gamma(k)$ of density excitations of two-component
Bose-Einstein condensates at zero temperature. Those excitations, where the two
components oscillate in phase, include the Goldstone mode resulting from
condensation. While ... | cond-mat_quant-gas |
Magnetic Phase Transition in the Ground-State Phase Diagram of Binary
Bose Gases in Optical Lattices: We investigate the ground-state phase diagram of interacting binary Bose
gases trapped in two-dimensional optical lattices by means of quantum Monte
Carlo simulations. Our simulations reveal a magnetic phase transiti... | cond-mat_quant-gas |
Charge density wave and charge pump of interacting fermions in
circularly shaken hexagonal optical lattices: We analyze strong correlation effects and topological properties of
interacting fermions with a Falicov-Kimball type interaction in circularly
shaken hexagonal optical lattices, which can be effectively descri... | cond-mat_quant-gas |
Zero-temperature equation of state of mass-imbalanced resonant Fermi
gases: We calculate the zero-temperature equation of state of mass-imbalanced
resonant Fermi gases in an ab initio fashion, by implementing the recent
proposal of imaginary-valued mass difference to bypass the sign problem in
lattice Monte Carlo cal... | cond-mat_quant-gas |
Quantum Field Theory of Correlated Bose-Einstein condensates: I. Basic
Formalism: Quantum field theory of equilibrium and nonequilibrium Bose-Einstein
condensates is formulated so as to satisfy three basic requirements: the
Hugenholtz-Pines relation; conservation laws; identities among vertices
originating from Golds... | cond-mat_quant-gas |
Stability and dynamics across magnetic phases of vortex-bright type
excitations in spinor Bose-Einstein condensates: The static properties, i.e., existence and stability, as well as the
quench-induced dynamics of vortex-bright type excitations in two-dimensional
harmonically confined spin-1 Bose-Einstein condensates ... | cond-mat_quant-gas |
A Strongly Interacting Polaritonic Quantum Dot: Polaritons are an emerging platform for exploration of synthetic materials
[1] and quantum information processing [2] that draw properties from two
disparate particles: a photon and an atom. Cavity polaritons are particularly
promising, as they are long-lived and their di... | cond-mat_quant-gas |
Dark-Bright Solitons in a Superfluid Bose-Fermi Mixture: The recent experimental realization of Bose-Fermi superfluid mixtures of
dilute ultracold atomic gases has opened new perspectives in the study of
quantum many-body systems. Depending on the values of the scattering lengths
and the amount of bosons and fermions, ... | cond-mat_quant-gas |
Two-dimensional scattering and bound states of polar molecules in
bilayers: Low-energy two-dimensional scattering is particularly sensitive to the
existence and properties of weakly-bound states. We show that interaction
potentials $V(r)$ with vanishing zero-momentum Born approximation $\int d^2r
V(r)=0$ lead to an a... | cond-mat_quant-gas |
First-order spatial coherence measurements in a thermalized
two-dimensional photonic quantum gas: Phase transitions between different states of matter can profoundly modify
the order in physical systems, with the emergence of ferromagnetic or
topological order constituting important examples. Correlations allow to
qu... | cond-mat_quant-gas |
Dark-soliton-like excitations in the Yang-Gaudin gas of attractively
interacting fermions: Yrast states are the lowest energy states at given non-zero momentum and
provide a natural extension of the concept of dark solitons to
strongly-interacting one-dimensional quantum gases. Here we study the yrast
states of the b... | cond-mat_quant-gas |
Superfluidity and Stabilities of a Bose-Einstein condensate with
periodically modulated interatomic interaction: We study theoretically the superfluidity and stability of a Bose-Einstein
condensate (BEC) whose interatomic scattering length is periodically modulated
with optical Feshbach resonance. Our numerical study... | cond-mat_quant-gas |
Bose-Einstein Condensates in Non-abelian Gauge Fields: The recent success of the NIST group in generating abelian gauge field in
cold atoms has created opportunities to simulate electronic transports in
solids using atomic gases. Very recently, the NIST group has also announced in
a DARPA Meeting the creation of non-ab... | cond-mat_quant-gas |
Three-level Haldane-like model on dice optical lattice: We consider ultracold atoms in a two-dimensional optical lattice of the dice
geometry in a tight-binding regime. The atoms experience a laser-assisted
tunneling between the nearest neighbour sites of the dice lattice accompanied
by the momentum recoil. This allows... | cond-mat_quant-gas |
(Inverse) Magnetic Catalysis in Bose-Einstein Condensation of Neutral
Bound Pairs: The Bose-Einstein condensation of bound pairs made of oppositely charged
fermions in a magnetic field is investigated. We find that the condensation
temperature shows the magnetic catalysis effect in weak coupling and the
inverse magne... | cond-mat_quant-gas |
Synchronization transition in dipole-coupled two-level systems with
positional disorder: We study the decoherence dynamics of dipole-coupled two-level quantum systems
in Ramsey-type experiments. We focus on large networks of two-level systems,
confined to two spatial dimensions and with positional disorder giving ris... | cond-mat_quant-gas |
Strong optical self-focusing effect in coherent light scattering with
condensates: We present a theoretical investigation of optical self-focusing effects in
light scattering with condensates. Using long (>200 \mu s), red-detuned pulses
we show numerically that a non-negligible self-focusing effect is present that
ca... | cond-mat_quant-gas |
Confinement-induced collapse of a dipolar Bose-Einstein condensate: We report on the observation of the confinement-induced collapse dynamics of
a dipolar Bose-Einstein condensate (dBEC) in a one-dimensional optical lattice.
We show that for a fixed interaction strength the collapse can be initiated
in-trap by lowering... | cond-mat_quant-gas |
Design and construction of a quantum matter synthesizer: The quantum matter synthesizer (QMS) is a new quantum simulation platform in
which individual particles in a lattice can be resolved and re-arranged into
arbitrary patterns. The ability to spatially manipulate ultracold atoms and
control their tunneling and inter... | cond-mat_quant-gas |
Excitation spectrum of a mixture of two Bose gases confined in a ring
potential with interaction asymmetry: We study the rotational properties of a two-component Bose-Einstein condensed
gas of distinguishable atoms which are confined in a ring potential using both
the mean-field approximation, as well as the method o... | cond-mat_quant-gas |
Disordered structures in ultracold spin-imbalanced Fermi gas: We investigate properties of spin-imbalanced ultracold Fermi gas in a large
range of spin polarizations at low temperatures. We present results of
microscopic calculations based on mean-field and density functional theory
approaches, with no symmetry constra... | cond-mat_quant-gas |
Thermal suppression of demixing dynamics in a binary condensate: We investigate the demixing dynamics in a binary two-dimensional (2D) Bose
superfluid using classical-field dynamics. By quenching the interspecies
interaction parameter, we identify a strong and weak separation regime
depending on the system temperature ... | cond-mat_quant-gas |
Dynamical transitions and quantum quenches in mean-field models: We develop a generic method to compute the dynamics induced by quenches in
completely connected quantum systems. These models are expected to provide a
mean-field description at least of the short time dynamics of finite
dimensional system. We apply our m... | cond-mat_quant-gas |
Cavity-enhanced optical lattices for scaling neutral atom quantum
technologies to higher qubit numbers: We demonstrate a cavity-based solution to scale up experiments with ultracold
atoms in optical lattices by an order of magnitude over state-of-the-art free
space lattices. Our two-dimensional optical lattices are c... | cond-mat_quant-gas |
Goldstone mode and pair-breaking excitations in atomic Fermi superfluids: Spontaneous symmetry breaking is a central paradigm of elementary particle
physics, magnetism, superfluidity and superconductivity. According to
Goldstone's theorem, phase transitions that break continuous symmetries lead to
the existence of gapl... | cond-mat_quant-gas |
Energy Cascade in Quantum Gases: Energy cascade is ubiquitous in systems far from equilibrium. Facilitated by
particle interactions and external forces, it can lead to highly complex
phenomena like fully developed turbulence, characterized by power law velocity
correlation functions. Yet despite decades of research, ho... | cond-mat_quant-gas |
Induced supersolidity in a Dy-Er mixture: Recent experimental realization of the heteronuclear dipolar mixture of Dy
and Er atoms opens fascinating prospects for creating intriguing novel phases
in dipolar quantum gases. The experimentally measured value of intra-species
$s$-wave scattering length of $^{166}$Er condens... | 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 |
Finite temperature theory of superfluid bosons in optical lattices: A practical finite temperature theory is developed for the superfluid regime
of a weakly interacting Bose gas in an optical lattice with additional harmonic
confinement. We derive an extended Bose-Hubbard model that is valid for shallow
lattices and wh... | cond-mat_quant-gas |
The one-dimensional Bose gas with strong two-body losses: the effect of
the harmonic confinement: We study the dynamics of a one-dimensional Bose gas in presence of strong
two-body losses. In this dissipative quantum Zeno regime, the gas fermionises
and its dynamics can be described with a simple set of rate equation... | cond-mat_quant-gas |
Dynamics of spin-polarized impurity in ultracold Fermi gas: We show that the motion of spin-polarized impurity (ferron) in ultracold
atomic gas is characterized by a certain critical velocity which can be traced
back to the amount of spin imbalance inside the impurity. We have calculated
the effective mass of ferron in... | 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 |
Spontaneous Magnetic Ordering in a Ferromagnetic Spinor Dipolar
Bose-Einstein Condensate: We study the spin dynamics in a spin-1 ferromagnetic Bose-Einstein condensate
with magnetic dipole-dipole interaction (MDDI) based on the Gross-Pitaevskii
and Bogoliubov theories. We find that various magnetic structures such as... | cond-mat_quant-gas |
Three-body scattering area for particles with infinite or zero
scattering length in two dimensions: We derive the asymptotic expansions of the wave function of three particles
having equal mass with finite-range interactions and infinite or zero
two-dimensional scattering length colliding at zero energy and zero orbi... | cond-mat_quant-gas |
Nature of polaron-molecule transition in Fermi polarons: In this work, we explore the polaron and molecule physics by utilizing a
unified variational ansatz with up to two particle-hole(p-h)
excitations(V-2ph). We confirm the existence of a first-order transition in 3D
and 2D Fermi polarons, and show that the nature of... | cond-mat_quant-gas |
Observation of a two-dimensional Fermi gas of atoms: We have prepared a degenerate gas of fermionic atoms which move in two
dimensions while the motion in the third dimension is "frozen" by tight
confinement and low temperature. {\it In situ} imaging provides direct
measurement of the density profile and temperature. T... | cond-mat_quant-gas |
Long-range sound-mediated dark soliton interactions in trapped atomic
condensates: A long-range soliton interaction is discussed whereby two or more dark
solitons interact in an inhomogeneous atomic condensate, modifying their
respective dynamics via the exchange of sound waves without ever coming into
direct contact... | cond-mat_quant-gas |
Supersolid-like square- and honeycomb-lattice crystallization of
droplets in a dipolar condensate: We demonstrate a supersolid-like spatially-periodic square- and
honeycomb-lattice crystallization of droplets, in addition to the
commonly-studied triangular-lattice crystallization, in a
cylindrically-symmetric quasi-t... | cond-mat_quant-gas |
The self-energy of an impurity in an ideal Fermi gas to second order in
the interaction strength: We study in three dimensions the problem of a spatially homogeneous
zero-temperature ideal Fermi gas of spin-polarized particles of mass $m$
perturbed by the presence of a single distinguishable impurity of mass $M$. The... | cond-mat_quant-gas |
Many-body tunneling dynamics of Bose-Einstein condensates and vortex
states in two spatial dimensions: In this work, we study the out-of-equilibrium many-body tunneling dynamics of
a Bose-Einstein condensate in a two-dimensional radial double well. We
investigate the impact of interparticle repulsion and compare the ... | cond-mat_quant-gas |
Vortex annihilation and inverse cascades in two dimensional superfluid
turbulence: We study two dimensional superfluid turbulence by employing an effective
description valid in the limit where the density of superfluid vortices is
parametrically small. At sufficiently low temperatures the effective
description yields... | cond-mat_quant-gas |
Quantum phase diagram for two species hardcore bosons in one-dimensional
optical lattices with the resonantly driven Rabi frequency: We propose an experimental realization of the time-periodically modulated
Rabi frequency and suggest density-dependent hoppings of two species hardcore
bosons in a one-dimensional optic... | cond-mat_quant-gas |
Bogoliubov excitation spectrum of an elongated condensate from
quasi-one-dimensional to three-dimensional transition: The quasiparticle excitation spectra of a Bose gas trapped in a highly
anisotropic trap is studied with respect to varying total number of particles
by numerically solving the effective one-dimensiona... | cond-mat_quant-gas |
Universal Five- and Six-Body Droplets Tied to an Efimov Trimer: We explore the properties of weakly bound bosonic states in the strongly
interacting regime. Combining a correlated-Gaussian (CG) basis set expansion
with a complex scaling method, we extract the energies and structural
properties of bosonic cluster states... | cond-mat_quant-gas |
Optical Flux Lattices for Two-Photon Dressed States: We describe a simple scheme by which "optical flux lattices" can be
implemented in ultracold atomic gases using two-photon dressed states. This
scheme can be applied, for example, to the ground state hyperfine levels of
commonly used atomic species. The resulting flu... | cond-mat_quant-gas |
Topological bands with Chern number C=2 by dipolar exchange interactions: We demonstrate the realization of topological band structures by exploiting
the intrinsic spin-orbit coupling of dipolar interactions in combination with
broken time-reversal symmetry. The system is based on polar molecules trapped
in a deep opti... | cond-mat_quant-gas |
Z_2 Topological Insulators in Ultracold Atomic Gases: We describe how optical dressing can be used to generate bandstructures for
ultracold atoms with non-trivial Z_2 topological order. Time reversal symmetry
is preserved by simple conditions on the optical fields. We first show how to
construct optical lattices that g... | cond-mat_quant-gas |
High-precision numerical solution of the Fermi polaron problem and
large-order behavior of its diagrammatic series: We introduce a simple determinant diagrammatic Monte Carlo algorithm to
compute the ground-state properties of a particle interacting with a Fermi sea
through a zero-range interaction. The fermionic sig... | cond-mat_quant-gas |
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