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First-order dissipative phase transition in an exciton-polariton
condensate: We investigate the phase diagram of a two-dimensional driven-dissipative
system of polaritons coupled to the excitonic reservoir. We find that two
critical points exists. The first corresponds to the quasi-condensation and the
second to a fi... | cond-mat_quant-gas |
Behavior of heat capacity of an attractive Bose-Einstein Condensate
approaching collapse: We report calculation of heat capacity of an attractive Bose-Einstein
condensate, with the number N of bosons increasing and eventually approaching
the critical number Ncr for collapse, using the correlated potential harmonics
(... | cond-mat_quant-gas |
All-optical cooling of Fermi gases via Pauli inhibition of spontaneous
emission: A technique is proposed to cool Fermi gases to the regime of quantum
degeneracy based on the expected inhibition of spontaneous emission due to the
Pauli principle. The reduction of the linewidth for spontaneous emission
originates a cor... | cond-mat_quant-gas |
Gapped spectrum in pair-superfluid bosons: We study the ground state of a bilayer system of dipolar bosons with dipoles
oriented by an external field perpendicularly to the two parallel planes. By
decreasing the interlayer distance, for a fixed value of the strength of the
dipolar interaction, the system undergoes a qu... | cond-mat_quant-gas |
Single-Atom Resolved Fluorescence Imaging of an Atomic Mott Insulator: The reliable detection of single quantum particles has revolutionized the
field of quantum optics and quantum information processing. For several years,
researchers have aspired to extend such detection possibilities to larger scale
strongly correla... | 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 |
Life Cycle of Superfluid Vortices and Quantum Turbulence in the Unitary
Fermi Gas: The unitary Fermi gas (UFG) offers an unique opportunity to study quantum
turbulence both experimentally and theoretically in a strongly interacting
fermionic superfluid. It yields to accurate and controlled experiments, and
admits the... | cond-mat_quant-gas |
Realizing bright matter-wave soliton collisions with controlled relative
phase: We propose a method to split the ground state of an attractively interacting
atomic Bose-Einstein condensate into two bright solitary waves with controlled
relative phase and velocity. We analyze the stability of these waves against
their... | cond-mat_quant-gas |
Quench Dynamics of Three-Dimensional Disordered Bose Gases:
Condensation, Superfluidity and Fingerprint of Dynamical Bose Glass: In an equilibrium three-dimensional (3D) disordered condensate, it's well
established that disorder can generate an amount of normal fluid equaling to
$\frac{4}{3}$ of the condensate deplet... | cond-mat_quant-gas |
Exact Solution for 1D Spin-Polarized Fermions with Resonant Interactions: Using the asymptotic Bethe Ansatz, we obtain an exact solution of the
many-body problem for 1D spin-polarized fermions with resonant p-wave
interactions, taking into account the effects of both scattering volume and
effective range. Under typical... | cond-mat_quant-gas |
Chaotic Einstein-Podolsky-Rosen pairs, measurements and time reversal: We consider a situation when evolution of an entangled
Einstein-Podolsky-Rosen (EPR) pair takes place in a regime of quantum chaos
being chaotic in the classical limit. This situation is studied on an example
of chaotic pair dynamics described by th... | cond-mat_quant-gas |
Experimental Observation of the 2D-1D Dimensional Crossover in Strongly
Interacting Ultracold Bosons: Dimensionality plays an essential role in determining the nature and
properties of a physical system. For quantum systems the impact of interactions
and fluctuations is enhanced in lower dimensions, leading to a grea... | cond-mat_quant-gas |
Observability of Quantum Criticality and a Continuous Supersolid in
Atomic Gases: We analyze the Bose-Hubbard model with a three-body hardcore constraint by
mapping the system to a theory of two coupled bosonic degrees of freedom. We
find striking features that could be observable in experiments, including a
quantum ... | cond-mat_quant-gas |
Ultracold molecules for quantum simulation: rotational coherences in CaF
and RbCs: We explore the uses of ultracold molecules as a platform for future
experiments in the field of quantum simulation, focusing on two molecular
species, $^{40}$Ca$^{19}$F and $^{87}$Rb$^{133}$Cs. We report the development
of coherent qua... | cond-mat_quant-gas |
From non equilibrium quantum Brownian motion to impurity dynamics in 1D
quantum liquids: Impurity motion in one dimensional ultra cold quantum liquids confined in an
optical trap has attracted much interest recently. As a step towards its full
understanding, we construct a generating functional from which we derive t... | cond-mat_quant-gas |
Response of fermions in Chern bands to spatially local quenches: We study the dynamical evolution of Chern-band systems after subjecting them
to local quenches. For open-boundary systems, we show for half-filling that the
chiral nature of edge states is manifested in the time-dependent chiral
response to local density ... | cond-mat_quant-gas |
Generating scalable entanglement of ultracold bosons in superlattices
through resonant shaking: Based on a one-dimensional double-well superlattice with a unit filling of
ultracold atoms per site, we propose a scheme to generate scalable entangled
states in the superlattice through resonant lattice shakings. Our sche... | cond-mat_quant-gas |
Topological inheritance in half-SSH Hubbard models: The interplay between interparticle interactions and topological features may
result in unusual phenomena. Interestingly, interactions may induce topological
features in an originally trivial system, as we illustrate for the case of a
one-dimensional two-component Hub... | cond-mat_quant-gas |
Quasi-1D atomic gases across wide and narrow
confinement-induced-resonances: We study quasi-one-dimensional atomic gases across wide and narrow
confinement-induced-resonances (CIR). We show from Virial expansion that by
tuning the magnetic field, the repulsive scattering branch initially prepared
at low fields can co... | cond-mat_quant-gas |
The interaction-sensitive states of a trapped two-component ideal Fermi
gas and application to the virial expansion of the unitary Fermi gas: We consider a two-component ideal Fermi gas in an isotropic harmonic
potential. Some eigenstates have a wavefunction that vanishes when two
distinguishable fermions are at the ... | cond-mat_quant-gas |
Thermal and quantum noncondensate particles near the superfluid to Mott
insulator transition: We investigate the finite temperature momentum distribution of bosonic
noncondensate particles inside a 3D optical lattice near the superfluid to Mott
insulator transition point, treating the quantum fluctuation and thermal
... | cond-mat_quant-gas |
Bosonic orbital Su-Schrieffer-Heeger model in a lattice of rings: We study the topological properties of interacting and non-interacting bosons
loaded in the orbital angular momentum states $l=1$ in a lattice of rings with
alternating distances. At the single-particle level, the two circulation states
within each site ... | cond-mat_quant-gas |
Spin-orbit coupled fermions in ladder-like optical lattices at
half-filling: We study the ground-state phase diagram of two-component fermions loaded in a
ladder-like lattice at half filling in the presence of spin-orbit coupling. For
repulsive fermions with unidirectional spin-orbit coupling along the legs we
identi... | cond-mat_quant-gas |
Boosting the Rotational Sensitivity of Matter-wave Interferometry with
Nonlinearity: We propose a mechanism to use nonlinearity arising from inter-particle
interactions to significantly enhance rotation sensitivity of matter-wave
interferometers. The method relies on modifying Sagnac interferometers by
introducing a ... | cond-mat_quant-gas |
Efficient production of a narrow-line erbium magneto-optical trap with
two-stage slowing: We describe an experimental setup for producing a large cold erbium (Er)
sample in a narrow-line magneto-optical trap (MOT) in a simple and efficient
way. We implement a pair of angled slowing beams with respect to the Zeeman
sl... | cond-mat_quant-gas |
The pinning quantum phase transition in a Tonks Girardeau gas:
diagnostics by ground state fidelity and the Loschmidt echo: We study the pinning quantum phase transition in a Tonks-Girardeau gas, both
in equilibrium and out-of-equilibrium, using the ground state fidelity and the
Loschmidt echo as diagnostic tools. Th... | cond-mat_quant-gas |
Fermionic transport in a homogeneous Hubbard model: Out-of-equilibrium
dynamics with ultracold atoms: Transport properties are among the defining characteristics of many important
phases in condensed matter physics. In the presence of strong correlations they
are difficult to predict even for model systems like the H... | cond-mat_quant-gas |
Universal Superfluid Transition and Transport Properties of
Two-Dimensional Dirty Bosons: We study the phase diagram of two-dimensional, interacting bosons in the
presence of a correlated disorder in continuous space, using large-scale finite
temperature quantum Monte Carlo simulations. We show that the superfluid
tr... | cond-mat_quant-gas |
Quasi-long-range order in trapped two-dimensional Bose gases: We study the fate of algebraic decay of correlations in a harmonically
trapped two-dimensional degenerate Bose gas. The analysis is inspired by recent
experiments on ultracold atoms where power-law correlations have been observed
despite the presence of the ... | cond-mat_quant-gas |
Glassy properties of the Bose-glass phase of a one-dimensional
disordered Bose fluid: We study a one-dimensional disordered Bose fluid using bosonization, the
replica method and a nonperturbative functional renormalization-group approach.
The Bose-glass phase is described by a fully attractive strong-disorder fixed
p... | cond-mat_quant-gas |
Dynamical properties of the unitary Fermi gas: collective modes and
shock waves: We discuss the unitary Fermi gas made of dilute and ultracold atoms with an
infinite s-wave inter-atomic scattering length. First we introduce an efficient
Thomas-Fermi-von Weizsacker density functional which describes accurately
various... | cond-mat_quant-gas |
Magnetism and pairing of two-dimensional trapped fermions: The emergence of local phases in a trapped two-component Fermi gas in an
optical lattice is studied using quantum Monte Carlo simulations. We treat
temperatures that are comparable or lower than those presently achievable in
experiments and large enough systems... | cond-mat_quant-gas |
Spin-Flipping Half Vortex in a Macroscopic Polariton Spinor Ring
Condensate: We report the observation of vorticity in a macroscopic Bose-Einstein
condensate of polaritons in a ring geometry. Because it is a spinor condensate,
the elementary excitations are "half vortices" in which there is a phase
rotation of $\pi$ ... | cond-mat_quant-gas |
Quantum phases of incommensurate optical lattices due to cavity
backaction: Ultracold bosonic atoms are confined by an optical lattice inside an optical
resonator and interact with a cavity mode, whose wave length is incommensurate
with the spatial periodicity of the confining potential. We predict that the
intracavi... | cond-mat_quant-gas |
From weak to strong: constrained extrapolation of perturbation series
with applications to dilute Fermi systems: We develop a method that uses truncation-order-dependent re-expansions
constrained by generic strong-coupling information to extrapolate perturbation
series to the nonperturbative regime. The method is fir... | cond-mat_quant-gas |
Effects of spatially inhomogeneous atomic interactions on Bose-Einstein
condensates in optical lattices: An interplay of optical lattices and nonlinear impurities in controlling the
dynamics of Bose-Einstein condensate bright solitons is investigated using
effective potential approach. The ability of pushing the soli... | cond-mat_quant-gas |
Ferromagnetism in tilted fermionic Mott insulators: We investigate the magnetism in tilted fermionic Mott insulators. With a
small tilt, the fermions are still localized and form a Mott-insulating state,
where the localized spins interact via antiferromagnetic exchange coupling.
While the localized state is naively exp... | cond-mat_quant-gas |
Collective fermion excitation in a warm massless Dirac system: Basing on a self-consistent method, we predict theoretically that there
occurs not only a normal (quasi) fermion mode, but also a collective fermion
mode, plasmino, in a warm 2D massless Dirac system, especially in a warm
intrinsic graphene system. Results ... | cond-mat_quant-gas |
Realizing a scalable building block of a U(1) gauge theory with cold
atomic mixtures: In the fundamental laws of physics, gauge fields mediate the interaction
between charged particles. An example is quantum electrodynamics -- the theory
of electrons interacting with the electromagnetic field -- based on U(1) gauge
s... | cond-mat_quant-gas |
Phase diagram and optimal control for n-tupling discrete time crystal: A remarkable consequence of spontaneously breaking the time translational
symmetry in a system, is the emergence of time crystals. In periodically driven
systems, discrete time crystals (DTC) can be realized which have a periodicity
that is n times ... | cond-mat_quant-gas |
Finite-rate quenches of site bias in the Bose-Hubbard dimer: For a Bose-Hubbard dimer, we study quenches of the site energy imbalance,
taking a highly asymmetric Hamiltonian to a fully symmetric one. The ramp is
carried out over a finite time that interpolates between the instantaneous and
adiabatic limits. We provide ... | cond-mat_quant-gas |
Competing Supersolid and Haldane Insulator phases in the extended
one-dimensional bosonic Hubbard model: The Haldane Insulator is a gapped phase characterized by an exotic non-local
order parameter. The parameter regimes at which it might exist, and how it
competes with alternate types of order, such as supersolid or... | cond-mat_quant-gas |
Experimental realization of a long-range antiferromagnet in the Hubbard
model with ultracold atoms: Many exotic phenomena in strongly correlated electron systems emerge from the
interplay between spin and motional degrees of freedom. For example, doping an
antiferromagnet gives rise to interesting phases including ps... | cond-mat_quant-gas |
Microscopic Approach to Shear Viscosities in Superfluid Gases: From BCS
to BEC: We compute the shear viscosity, $\eta$, at general temperatures $T$, in a
BCS-BEC crossover scheme which is demonstrably consistent with conservation
laws. The study of $\eta$ is important because it constrains microscopic
theories by rev... | cond-mat_quant-gas |
Quasi-particle Lifetime in a Mixture of Bose and Fermi Superfluids: In this letter, to reveal the effect of quasi-particle interactions in a
Bose-Fermi superfluid mixture, we consider the lifetime of quasi-particle of
Bose superfluid due to its interaction with quasi-particles in Fermi
superfluid. We find that this dam... | cond-mat_quant-gas |
Direct observation of chiral currents and magnetic reflection in atomic
flux lattices: The prospect of studying topological matter with the precision and control of
atomic physics has driven the development of many techniques for engineering
artificial magnetic fields and spin-orbit interactions. Recently, the idea o... | cond-mat_quant-gas |
Properties of dipolar bosonic quantum gases at finite temperatures: The properties of ultracold quantum gases of bosons with dipole-dipole
interaction is investigated at finite temperature in the frame of the
representative ensembles theory. Self-consistent coupled equations of motion
are derived for the condensate and... | cond-mat_quant-gas |
Diversified vortex phase diagram for a rotating trapped two-band Fermi
gas in the BCS-BEC crossover: We report the equilibrium vortex phase diagram of a rotating two-band Fermi
gas confined to a cylindrically symmetric parabolic trapping potential, using
the recently developed finite-temperature effective field theor... | cond-mat_quant-gas |
Rigorous mean-field dynamics of lattice bosons: Quenches from the Mott
insulator: We provide a rigorous derivation of Gutzwiller mean-field dynamics for
lattice bosons, showing that it is exact on fully connected lattices. We apply
this formalism to quenches in the interaction parameter from the Mott insulator
to the... | cond-mat_quant-gas |
Interorbital Interactions in an SU(2)xSU(6)-Symmetric Fermi-Fermi
Mixture: We characterize inter- and intraisotope interorbital interactions between
atoms in the 1S0 ground state and the 3P0 metastable state in interacting
Fermi-Fermi mixtures of 171Yb and 173Yb. We perform high-precision clock
spectroscopy to measur... | cond-mat_quant-gas |
Controllable high-speed polariton waves in a PT-symmetric lattice: Parity-time (PT) symmetry gives rise to unusual phenomena in many physical
systems, presently attracting a lot of attention. One essential and non-trivial
task is the fabrication and design of the PT-symmetric lattices in different
systems. Here we intr... | cond-mat_quant-gas |
Mean field study of 2D quasiparticle condensate formation in presence of
strong decay: Bose-condensation in a system of 2D quasiparticles is considered in the scope
of a microscopic model. Mean-field dynamical equations are derived with the
help of the Schwinger-Keldysh formalism and a simple model is proposed which
... | cond-mat_quant-gas |
Finite-Temperature Auxiliary-Field Quantum Monte Carlo for Bose-Fermi
Mixtures: We present a quantum Monte Carlo (QMC) technique for calculating the exact
finite-temperature properties of Bose-Fermi mixtures. The Bose-Fermi
Auxiliary-Field Quantum Monte Carlo (BF-AFQMC) algorithm combines two methods,
a finite-temper... | cond-mat_quant-gas |
Quantum simulation of the Hubbard model with ultracold fermions in
optical lattices: Ultracold atomic gases provide a fantastic platform to implement quantum
simulators and investigate a variety of models initially introduced in
condensed matter physics or other areas. One of the most promising applications
of quantu... | cond-mat_quant-gas |
Collectively pair-driven-dissipative bosonic arrays: exotic and
self-oscillatory condensates: Modern quantum platforms such as superconducting circuits provide exciting
opportunities for the experimental exploration of driven-dissipative many-body
systems in unconventional regimes. One of such regimes occurs in boson... | cond-mat_quant-gas |
Cavity-Controlled Collective Scattering at the Recoil Limit: We study collective scattering with Bose-Einstein condensates interacting
with a high-finesse ring cavity. The condensate scatters the light of a
transverse pump beam superradiantly into modes which, in contrast to previous
experiments, are not determined by ... | cond-mat_quant-gas |
Goos-Hänchen shifts in spin-orbit-coupled cold atoms: We consider a matter wave packet of cold atom gas impinging upon a step
potential created by the optical light field. In the presence of spin-orbit
(SO) coupling, the atomic eigenstates contain two types of evanescent states,
one of which is the ordinary evanescent ... | cond-mat_quant-gas |
Roton excitations in a trapped dipolar Bose-Einstein condensate: We consider the quasi-particle excitations of a trapped dipolar Bose-Einstein
condensate. By mapping these excitations onto radial and angular momentum we
show that the roton modes are clearly revealed as discrete fingers in parameter
space, whereas the o... | cond-mat_quant-gas |
Antiferromagnetic behavior in self-bound one-dimensional composite
bosons: The structure of self-bound one-dimensional droplets containing a mixture of
Ytterbium fermionic isotopes ($^{173}$Yb, $^{171}$Yb) is calculated by means of
a diffusion Monte Carlo technique. We considered only balanced setups in which
all the... | cond-mat_quant-gas |
Fast phase-modulated optical lattice for wave packet engineering: We investigate experimentally a Bose Einstein condensate placed in a 1D
optical lattice whose phase is modulated at a frequency large compared to all
characteristic frequencies. As a result, the depth of the periodic potential is
renormalized by a Bessel... | cond-mat_quant-gas |
Stoner-Wohlfarth switching of the condensate magnetization in a dipolar
spinor gas and the metrology of excitation damping: We consider quasi-one-dimensional dipolar spinor Bose-Einstein condensates in
the homogeneous-local-spin-orientation approximation, that is with
unidirectional local magnetization. By analytical... | cond-mat_quant-gas |
A cavity-induced artificial gauge field in a Bose-Hubbard ladder: We consider theoretically ultracold interacting bosonic atoms confined to
quasi-one-dimensional ladder structures formed by optical lattices and coupled
to the field of an optical cavity. The atoms can collect a spatial phase
imprint during a cavity-assi... | cond-mat_quant-gas |
Quantum magnetism and topological ordering via enhanced Rydberg-dressing
near Förster-resonances: We devise a cold-atom approach to realizing a broad range of bi-linear
quantum magnets. Our scheme is based on off-resonant single-photon excitation
of Rydberg $P$-states (Rydberg-dressing), whose strong interactions ar... | cond-mat_quant-gas |
Universal nonanalytic behavior of the Hall conductance in a Chern
insulator at the topologically driven nonequilibrium phase transition: We study the Hall conductance of a Chern insulator after a global quench of
the Hamiltonian. The Hall conductance in the long time limit is obtained by
applying the linear response ... | cond-mat_quant-gas |
Quantum fluctuations in atomic Josephson junctions: the role of
dimensionality: We investigate the role of quantum fluctuations in the dynamics of a bosonic
Josephson junction in $D$ spatial dimensions, by using beyond mean-field
Gaussian corrections. We derive some key dynamical properties in a systematic
way for $D... | cond-mat_quant-gas |
Shear viscosity of a universal Fermi gas near the superfluid phase
transition: We precisely measure the shear viscosity for a resonantly interacting Fermi
gas as a function of temperature, from nearly the ground state through the
superfluid phase transition at a critical temperature $T_c$. Using an iterative
method t... | cond-mat_quant-gas |
Numerical and variational solutions of the dipolar Gross-Pitaevskii
equation in reduced dimensions: We suggest a simple Gaussian Lagrangian variational scheme for the reduced
time-dependent quasi-one- and quasi-two-dimensional Gross-Pitaevskii (GP)
equations of a dipolar Bose-Einstein condensate (BEC) in cigar and di... | cond-mat_quant-gas |
Matching universal behavior with potential models: Two-, three-, and four-boson systems are studied close to the unitary limit
using potential models constructed to reproduce the minimal information given
by the two-body scattering length $a$ and the two-body binding energy or
virtual state energy $E_2$. The particular... | cond-mat_quant-gas |
Equatorial Waves in Rotating Bubble-Trapped Superfluids: As the Earth rotates, the Coriolis force causes several oceanic and
atmospheric waves to be trapped along the equator, including Kelvin, Yanai,
Rossby, and Poincar\'e modes. It has been demonstrated that the mathematical
origin of these waves is related to the no... | cond-mat_quant-gas |
Three-body correlations in a two-dimensional SU(3) Fermi gas: We consider a three-component Fermi gas that has SU(3) symmetry and is
confined to two dimensions (2D). For realistic cold atomic gas experiments, we
show that the phase diagram of the quasi-2D system can be characterized using
two 2D scattering parameters: ... | cond-mat_quant-gas |
Engineering infinite-range SU($n$) interactions with spin-orbit-coupled
fermions in an optical lattice: We study multilevel fermions in an optical lattice described by the Hubbard
model with on site SU($n$)-symmetric interactions. We show that in an
appropriate parameter regime this system can be mapped onto a spin m... | cond-mat_quant-gas |
Phase fluctuations in anisotropic Bose condensates: from cigars to rings: We study the phase-fluctuating condensate regime of ultra-cold atoms trapped
in a ring-shaped trap geometry, which has been realized in recent experiments.
We first consider a simplified box geometry, in which we identify the
conditions to create... | cond-mat_quant-gas |
Geometrical quench and dynamical quantum phase transition in the
$α-T_3$ lattice: We investigate quantum quenches and the Loschmidt echo in the two
dimensional, three band $\alpha-T_3$ model, a close descendant of the dice
lattice. By adding a chemical potential to the central site, the integral of
the Berry curvatur... | cond-mat_quant-gas |
Fermi-Fermi crossover in the ground state of 1D few-body systems with
anomalous three-body interactions: In one spatial dimension, quantum systems with an attractive three-body
contact interaction exhibit a scale anomaly. In this work, we examine the
few-body sector for up to six particles. We study those systems wit... | cond-mat_quant-gas |
Vortex reconnections between coreless vortices in binary condensates: Vortex reconnections plays an important role in the turbulent flows
associated with the superfluids. To understand the dynamics, we examine the
reconnections of vortex rings in the superfluids of dilute atomic gases
confined in trapping potentials us... | cond-mat_quant-gas |
Superfluid drag in the two-component Bose-Hubbard model: In multicomponent superfluids and superconductors, co- and counter-flows of
components have in general different properties. It was discussed in 1975 by
Andreev and Bashkin, in the context of He$^3$/He$^4$ superfluid mixtures, that
inter-particle interactions pro... | cond-mat_quant-gas |
Exact results on the two-particle Green's function of a Bose-Einstein
condensate: Starting from the Dyson-Beliaev and generalized Gross-Pitaevskii equations
with an extra nonlocal potential, we derive an exact expression of the
two-particle Green's function K for an interacting Bose-Einstein condensate in
terms of un... | cond-mat_quant-gas |
Parametric Instabilities in Resonantly-Driven Bose-Einstein Condensates: Shaking optical lattices in a resonant manner offers an efficient and
versatile method to devise artificial gauge fields and topological band
structures for ultracold atomic gases. This was recently demonstrated through
the experimental realizatio... | cond-mat_quant-gas |
Dynamical formation of the unitary Bose gas: We study the structure of a Bose-condensed gas after quenching interactions
to unitarity. Using the method of cumulants, we decompose the evolving gas in
terms of clusters. Within the quantum depletion we observe the emergence of
two-body clusters bound purely by many-body e... | cond-mat_quant-gas |
Interaction-driven dynamical quantum phase transitions in a strongly
correlated bosonic system: We study dynamical quantum phase transitions (DQPTs) in the extended
Bose-Hubbard model after a sudden quench of the nearest-neighbor interaction
strength. Using the time-dependent density matrix renormalization group, we
... | cond-mat_quant-gas |
Effective interaction in an unbalanced Fermion mixture: A one dimensional Fermi mixture with delta--interaction is investigated in
the limit of extreme imbalance. In particular we consider the cases of only one
or two minority Fermions which interact with the Fermi-sea of the majority
Fermions. We calculate dispersion ... | cond-mat_quant-gas |
Observation of Nonlinear Response and Onsager Regression in a Photon
Bose-Einstein Condensate: The quantum regression theorem states that the correlations of a system at
two different times are governed by the same equations of motion as the
temporal response of the average values. Such a relation provides a powerful... | cond-mat_quant-gas |
Mixtures of dipolar gases in two dimensions: a quantum Monte Carlo study: We studied the miscibility of two dipolar quantum gases in the limit of zero
temperature. The system under study is composed by a mixture of two Bose gases
with dominant dipolar interaction in a two-dimensional harmonic confinement.
The dipolar m... | cond-mat_quant-gas |
Flavour-selective localization in interacting lattice fermions via SU(N)
symmetry breaking: A large repulsion between particles in a quantum system can lead to their
localization, as it happens for the electrons in Mott insulating materials.
This paradigm has recently branched out into a new quantum state, the
orbita... | cond-mat_quant-gas |
Exotic superfluidity in cold atoms: We derived the low energy effective action for the collective modes in
asymmetric fermionic systems with attractive interaction. We obtained the phase
diagram in terms of the chemical potentials. It features a stable gapless
superfluidity with one Fermi surface on the BEC side of the... | cond-mat_quant-gas |
Revealing the Condensate and Non-Condensate Distributions in the
Inhomogeneous Bose-Hubbard Model: We calculate the condensate fraction and the condensate and non-condensate
spatial and momentum distribution of the Bose-Hubbard model in a trap. From our
results, it is evident that using approximate distributions can ... | cond-mat_quant-gas |
Fractional quantization of charge and spin in topological quantum pumps: Topological quantum pumps are topologically equivalent to the quantum Hall
state: In these systems, the charge pumped during each pumping cycle is
quantized and coincides with the Chern invariant. However, differently from
quantum Hall insulators,... | 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 |
Truncated many-body dynamics of interacting bosons: A variational
principle with error monitoring: We develop a method to describe the temporal evolution of an interacting
system of bosons, for which the field operator expansion is truncated after a
finite number $M$ of modes, in a rigorously controlled manner. Using... | cond-mat_quant-gas |
Multichannel Molecular State and Rectified Short-range Boundary
Condition for Spin-orbit Coupled Ultracold Fermions Near p-wave Resonances: We study the interplay of spin-orbit coupling (SOC) and strong p-wave
interaction to the scattering property of spin-1/2 ultracold Fermi gases. Based
on a two-channel square-well... | cond-mat_quant-gas |
Condensation of Cooper Triples: The condensation of Cooper pairs, originating from the Fermi-surface
instability due to a weakly attractive interaction between two fermions, opened
a new frontier for exploring many-body physics in interdisciplinary contexts.
In this work, we discuss the possible condensation of Cooper ... | cond-mat_quant-gas |
Casimir force of a dilute Bose gas confined by a parallel plate geometry
in improved Hatree-Fock approximation: Within framework of quantum field theory, in improved Hatree-Fock (IHF)
approximation, we have considered a dilute single Bose-Einstein condensate
(BEC) confined between two parallel plates. We found that t... | cond-mat_quant-gas |
Large-N ground state of the Lieb-Liniger model and Yang-Mills theory on
a two-sphere: We derive the large particle number limit of the Bethe equations for the
ground state of the attractive one-dimensional Bose gas (Lieb-Liniger model) on
a ring and solve it for arbitrary coupling. We show that the ground state of
th... | cond-mat_quant-gas |
Vortex Lattices in Strongly Confined Quantum Droplets: Bose mixture quantum droplets display a fascinating stability that relies on
quantum fluctuations to prevent collapse driven by mean-field effects. Most
droplet research focuses on untrapped or weakly trapped scenarios, where the
droplets exhibit a liquid-like flat... | cond-mat_quant-gas |
Improved Silbey-Harris polaron ansatz for the spin-boson model: In this paper, the well-known Silbey-Harris (SH) polaron ansatz for the
spin-boson model is improved by adding orthogonal displaced Fock states. The
obtained results for the ground state in all baths converge very quickly within
finite displaced Fock state... | cond-mat_quant-gas |
Generalized Effective Potential Landau Theory for Bosonic Quadratic
Superlattices: We study the properties of the Bose-Hubbard model for a quadratic optical
superlattice. To this end we generalize a recently established effective
potential Landau theory for a single component to the case of multi components
and find ... | cond-mat_quant-gas |
Fractional domain walls from on-site softening in dipolar bosons: We study dipolar bosons in a 1D optical lattice and identify a region in
parameter space---strong coupling but relatively weak on-site
repulsion---hosting a series of stable charge-density-wave (CDW) states whose
low-energy excitations, built from "fract... | cond-mat_quant-gas |
Localization driven superradiant instability: The prominent Dicke superradiant phase arises from coupling an ensemble of
atoms to cavity optical field when external optical pumping exceeds a threshold
strength. Here we report a prediction of the superrandiant instability driven
by Anderson localization, realized with a... | cond-mat_quant-gas |
Universal nonanalytic behavior of the Hall conductance in a Chern
insulator at the topologically driven nonequilibrium phase transition: We study the Hall conductance of a Chern insulator after a global quench of
the Hamiltonian. The Hall conductance in the long time limit is obtained by
applying the linear response ... | cond-mat_quant-gas |
A nonlinear dynamics approach to Bogoliubov excitations of Bose-Einstein
condensates: We assume the macroscopic wave function of a Bose-Einstein condensate as a
superposition of Gaussian wave packets, with time-dependent complex width
parameters, insert it into the mean-field energy functional corresponding to
the Gr... | cond-mat_quant-gas |
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