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Anderson-Bogoliubov collective excitations in superfluid Fermi gases at
nonzero temperatures: The Anderson-Bogoliubov branch of collective excitations in a condensed Fermi
gas is treated using the effective bosonic action of Gaussian pair
fluctuations. The spectra of collective excitations are treated for finite
temp... | cond-mat_quant-gas |
Observation of Fermi surface deformation in a dipolar quantum gas: The deformation of a Fermi surface is a fundamental phenomenon leading to a
plethora of exotic quantum phases. Understanding these phases, which play
crucial roles in a wealth of systems, is a major challenge in atomic and
condensed-matter physics. Here... | cond-mat_quant-gas |
Mean-field study of itinerant ferromagnetism in trapped ultracold Fermi
gases: Beyond the local density approximation: We theoretically investigate the itinerant ferromagnetic transition of a
spherically trapped ultracold Fermi gas with spin imbalance under strongly
repulsive interatomic interactions. Our study is ba... | cond-mat_quant-gas |
Analytic models for density of a ground-state spinor condensate: We demonstrate that the ground state of a trapped spin-1 and spin-2 spinor
ferromagnetic Bose-Einstein condensate (BEC) can be well approximated by a
single decoupled Gross-Pitaevskii (GP) equation. Useful analytic models for the
ground-state densities of... | cond-mat_quant-gas |
Topological phase transitions in finite-size periodically driven
translationally invariant systems: It is known that, in the thermodynamic limit, the Chern number of a
translationally invariant system cannot change under unitary time evolutions
that are smooth in momentum space. Yet a real-space counterpart of the Ch... | cond-mat_quant-gas |
Application of the Feshbach-resonance management to a tightly confined
Bose-Einstein condensate: We study suppression of the collapse and stabilization of matter-wave
solitons by means of time-periodic modulation of the effective nonlinearity,
using the nonpolynomial Schroedinger equation (NPSE) for BEC trapped in a ... | cond-mat_quant-gas |
Formation, dynamics and stability of coreless vortex dipoles in
phase-separated binary condensates: We study the motion of the Gaussian obstacle potential created by blue
detuned laser beam through a phase-separated binary condensate in
pancake-shaped traps. For the velocity of the obstacle above a critical
velocity,... | cond-mat_quant-gas |
Particle correlations and evidence for dark state condensation in a cold
dipolar exciton fluid: In this paper we show experimental evidence of a few correlation regimes of a
cold dipolar exciton fluid, created optically in a semiconductor bilayer
heterostructure. In the higher temperature regime, the average interact... | cond-mat_quant-gas |
Quantum-geometric contribution to the Bogoliubov modes in a two-band
Bose-Einstein condensate: We consider a weakly-interacting Bose-Einstein condensate (BEC) that is
loaded into an optical lattice with a two-point basis, and described by a
two-band Bose-Hubbard model with generic one-body and two-body terms. By firs... | cond-mat_quant-gas |
All-optical pump-and-probe detection of dynamical correlations in a
two-dimensional Fermi gas: We propose an all-optical scheme to probe the dynamical correlations of a
strongly-interacting gas of ultracold atoms. The proposed technique is based on
a pump-and-probe scheme: a coherent light pulse is initially converte... | cond-mat_quant-gas |
Universality of the Three-Body Parameter for Efimov States in Ultracold
Cesium: We report on the observation of triatomic Efimov resonances in an ultracold
gas of cesium atoms. Exploiting the wide tunability of interactions resulting
from three broad Feshbach resonances in the same spin channel, we measure
magnetic-f... | cond-mat_quant-gas |
Monopole excitations of a harmonically trapped one-dimensional Bose gas
from the ideal gas to the Tonks-Girardeau regime: Using a time-dependent modified nonlinear Schr\"odinger equation (m-NLSE) --
where the conventional chemical potential proportional to the density is
replaced by the one inferred from Lieb-Liniger... | cond-mat_quant-gas |
Finite-range effects in the unitary Fermi polaron: Quantum Monte Carlo techniques are employed to study the properties of
polarons in an ultracold Fermi gas, at $T= 0,$ and in the unitary regime using
both a zero-range model and a square-well potential. For a fixed density, the
potential range is varied and results are... | cond-mat_quant-gas |
Efficient multipole representation for matter-wave optics: Technical optics with matter waves requires a universal description of
three-dimensional traps, lenses, and complex matter-wave fields. In analogy to
the two-dimensional Zernike expansion in beam optics, we present a
three-dimensional multipole expansion for Bo... | cond-mat_quant-gas |
Distortion of Interference Fringes and the Resulting Vortex Production
of Merging Bose-Einstein Condensates: We investigate the effects of interatomic interactions and expansion on the
distortion of interference fringes of a pair of initially well-separated, but
coherent, condensate clouds trapped in a harmonic trap.... | cond-mat_quant-gas |
The virial expansion of attractively interacting Fermi gases in 1D, 2D,
and 3D, up to fifth order: The virial expansion characterizes the high-temperature approach to the
quantum-classical crossover in any quantum many-body system. Here, we calculate
the virial coefficients up to the fifth-order of Fermi gases in 1D,... | cond-mat_quant-gas |
Mesoscopic spin transport between strongly interacting Fermi gases: We investigate a mesoscopic spin current for strongly interacting Fermi gases
through a quantum point contact. Under the situation where spin polarizations
in left and right reservoirs are same in magnitude but opposite in sign, we
calculate the contri... | cond-mat_quant-gas |
Mott Insulator-Density Ordered Superfluid Transition and "Shamrock
Transition" in a Frustrated Triangle Lattice: Density order is usually a consequence of the competition between long-range
and short-range interactions. Here we report a density ordered superfluid
emergent from a homogeneous Mott insulator due to the ... | cond-mat_quant-gas |
Local observation of pair-condensation in a Fermi gas at unitarity: We present measurements of the local (homogeneous) density-density response
function of a Fermi gas at unitarity using spatially resolved Bragg
spectroscopy. By analyzing the Bragg response across one axis of the cloud we
extract the response function ... | cond-mat_quant-gas |
Robust Vortex Lines, Vortex Rings and Hopfions in 3D Bose-Einstein
Condensates: Performing a systematic Bogoliubov-de Gennes spectral analysis, we illustrate
that stationary vortex lines, vortex rings and more exotic states, such as
hopfions, are robust in three-dimensional atomic Bose-Einstein condensates, for
large... | cond-mat_quant-gas |
Ground states of atomic Fermi gases in a two-dimensional optical lattice
with and without population imbalance: We study the ground state phase diagram of population balanced and imbalanced
ultracold atomic Fermi gases with a short range attractive interaction
throughout the crossover from BCS to Bose-Einstein conden... | cond-mat_quant-gas |
Ground-state phases of a mixture of spin-1 and spin-2 Bose-Einstein
condensates: We investigate the ground-state phases of a mixture of spin-1 and spin-2
Bose-Einstein condensates at zero magnetic field. In addition to the intra-spin
interactions, two spin-dependent interaction coefficients are introduced to
describe... | cond-mat_quant-gas |
Heavy polarons in ultracold atomic Fermi superfluids at the BEC-BCS
crossover: formalism and applications: We investigate the system of a heavy impurity embedded in a paired
two-component Fermi gas at the crossover from a Bose-Einstein condensate (BEC)
to a Bardeen--Cooper--Schrieffer (BCS) superfluid via an extensio... | cond-mat_quant-gas |
Macroscopic amplification of electroweak effects in molecular
Bose-Einstein condensates: We investigate the possible use of Bose-Einstein condensates of diatomic
molecules to measure nuclear spin-dependent parity violation effects, outlining
a detection method based on the internal Josephson effect between molecular
... | cond-mat_quant-gas |
Loschmidt echo in one-dimensional interacting Bose gases: We explore Loschmidt echo in two regimes of one-dimensional (1D) interacting
Bose gases: the strongly interacting Tonks-Girardeau (TG) regime, and the
weakly-interacting mean-field regime. We find that the Loschmidt echo of a TG
gas decays as a Gaussian when sma... | cond-mat_quant-gas |
Multipolar condensates and multipolar Josephson effects: When single-particle dynamics are suppressed in certain strongly correlated
systems, dipoles arise as elementary carriers of quantum kinetics. These
dipoles can further condense, providing physicists with a rich realm to study
fracton phases of matter. Whereas re... | cond-mat_quant-gas |
Bose-Hubbard realization of fracton defects: Bose-Hubbard models are simple paradigmatic lattice models used to study
dynamics and phases of quantum bosonic matter. We combine the extended
Bose-Hubbard model in the hard-core regime with ring-exchange hoppings. By
investigating the symmetries and low-energy properties o... | cond-mat_quant-gas |
Strongly Interacting Bose Gases near a $d$-wave Shape Resonance: Many unconventional quantum matters, such as fractional quantum Hall effect
and $d$-wave high-Tc superconductor, are discovered in strongly interacting
systems. Understanding quantum many-body systems with strong interaction and
the unconventional phases ... | cond-mat_quant-gas |
Introduction to quantum turbulence: The term quantum turbulence denotes the turbulent motion of quantum fluids,
systems such as superfluid helium and atomic Bose-Einstein condensates which
are characterized by quantized vorticity, uperfluidity and, at finite
temperatures, two-fluid behavior. This article introduces the... | cond-mat_quant-gas |
Impurity transport through a strongly interacting bosonic quantum gas: Using near-exact numerical simulations we study the propagation of an
impurity through a one-dimensional Bose lattice gas for varying bosonic
interaction strengths and filling factors at zero temperature. The impurity is
coupled to the Bose gas and ... | cond-mat_quant-gas |
Emergent Fermi sea in a system of interacting bosons: An understanding of the possible ways in which interactions can produce
fundamentally new emergent many-body states is a central problem of condensed
matter physics. We ask if a Fermi sea can arise in a system of bosons subject
to contact interaction. Based on exact... | cond-mat_quant-gas |
A Hubbard model for ultracold bosonic atoms interacting via
zero-point-energy induced three-body interactions: We show that for ultra-cold neutral bosonic atoms held in a three-dimensional
periodic potential or optical lattice, a Hubbard model with dominant,
attractive three-body interactions can be generated. In fac... | cond-mat_quant-gas |
Observation of the Hanbury Brown and Twiss Effect with Ultracold
Molecules: Measuring the statistical correlations of individual quantum objects provides
an excellent way to study complex quantum systems. Ultracold molecules
represent a powerful platform for quantum science due to their rich and
controllable internal... | cond-mat_quant-gas |
Quantum Degenerate Majorana Surface Zero Modes in Two-Dimensional Space: We investigate the topological properties of spin polarized fermionic polar
molecules loaded in a multi-layer structure with the electric dipole moment
polarized to the normal direction. When polar molecules are paired by
attractive inter-layer in... | cond-mat_quant-gas |
Virial expansion for a strongly correlated Fermi system and its
application to ultracold atomic Fermi gases: Strongly correlated Fermi system plays a fundamental role in very different
areas of physics, from neutron stars, quark-gluon plasmas, to high temperature
superconductors. Despite the broad applicability, it i... | cond-mat_quant-gas |
Enhanced many-body quantum scars from the non-Hermitian Fock skin effect: In contrast with extended Bloch waves, a single particle can become spatially
localized due to the so-called skin effect originating from non-Hermitian
pumping. Here we show that in a wide class of kinetically constrained many-body
systems, the s... | cond-mat_quant-gas |
Spatially distributed multipartite entanglement enables
Einstein-Podolsky-Rosen steering of atomic clouds: A key resource for distributed quantum-enhanced protocols is entanglement
between spatially separated modes. Yet, the robust generation and detection of
nonlocal entanglement between spatially separated regions ... | cond-mat_quant-gas |
Opto-mechanical effects in superradiant light scattering by
Bose-Einstein condensate in a cavity: We investigate the effects of a movable mirror (cantilever) of an optical
cavity on the superradiant light scattering from a Bose-Einstein condensate
(BEC) in an optical lattice. We show that the mirror motion has a dyna... | cond-mat_quant-gas |
Dynamical many-body phases of the parametrically driven, dissipative
Dicke model: The dissipative Dicke model exhibits a fascinating out-of-equilibrium
many-body phase transition as a function of a coupling between a driven
photonic cavity and numerous two-level atoms. We study the effect of a
time-dependent parametr... | cond-mat_quant-gas |
Continuum of classical-field ensembles from canonical to grand canonical
and the onset of their equivalence: The canonical and grand-canonical ensembles are two usual marginal cases for
ultracold Bose gases, but real collections of experimental runs commonly have
intermediate properties. Here we study the continuum o... | cond-mat_quant-gas |
Quantum Simulators at Negative Absolute Temperatures: We propose that negative absolute temperatures in ultracold atomic clouds in
optical lattices can be used to simulate quantum systems in new regions of
phase diagrams. First we discuss how the attractive SU(3) Hubbard model in
three dimensions can be realized using ... | cond-mat_quant-gas |
Long-range transverse Ising model built with dipolar condensates in
two-well arrays: Dipolar Bose-Einstein condensates in an array of double-well potentials
realize an effective transverse Ising model with peculiar inter-layer
interactions, that may result under proper conditions in an anomalous
first-order ferromagn... | cond-mat_quant-gas |
Time-Resolved Observation of Spin-Charge Deconfinement in Fermionic
Hubbard Chains: Elementary particles such as the electron carry several quantum numbers, for
example, charge and spin. However, in an ensemble of strongly interacting
particles, the emerging degrees of freedom can fundamentally differ from those
of t... | cond-mat_quant-gas |
Multistable circular currents of polariton condensates trapped in ring
potentials: We demonstrate the formation and trapping of different stationary solutions,
oscillatory solutions, and rotating solutions of a polariton condensate in a
planar semiconductor microcavity with a built-in ring-shaped potential well.
Mult... | cond-mat_quant-gas |
Generation and Detection of Atomic Spin Entanglement in Optical Lattices: Ultracold atoms in optical lattices offer a great promise to generate
entangled states for scalable quantum information processing owing to the
inherited long coherence time and controllability over a large number of
particles. We report on the g... | cond-mat_quant-gas |
Phase diagram of one-dimensional earth-alkaline cold fermionic atoms: The phase diagram of one-dimensional earth-alkaline fermionic atoms and
ytterbium 171 atoms is investigated by means of a low-energy approach and
density-matrix renormalization group calculations. For incommensurate filling,
four gapless phases with ... | cond-mat_quant-gas |
Pairing patterns in one-dimensional spin- and mass-imbalanced Fermi
gases: We study spin- and mass-imbalanced mixtures of spin-$\tfrac{1}{2}$ fermions
interacting via an attractive contact potential in one spatial dimension.
Specifically, we address the influence of unequal particle masses on the pair
formation by me... | cond-mat_quant-gas |
Topological Bose-Mott Insulators in a One-Dimensional Optical
Superlattice: We study topological properties of the Bose-Hubbard model with repulsive
interactions in a one-dimensional optical superlattice. We find that the Mott
insulator states of the single-component (two-component) Bose-Hubbard model
under fractiona... | cond-mat_quant-gas |
Dynamical solitons and boson fractionalization in cold-atom topological
insulators: We study the $\mathbb{Z}_2$ Bose-Hubbard model at incommensurate densities,
which describes a one-dimensional system of interacting bosons whose tunneling
is dressed by a dynamical $\mathbb{Z}_2$ field. At commensurate densities, the
... | cond-mat_quant-gas |
Synthetic Landau levels for photons: Synthetic photonic materials are an emerging platform for exploring the
interface between microscopic quantum dynamics and macroscopic material
properties[1-5]. Photons experiencing a Lorentz force develop handedness,
providing opportunities to study quantum Hall physics and topolog... | cond-mat_quant-gas |
Mean field analysis of quantum phase transitions in a periodic optical
superlattice: In this paper we analyze the various phases exhibited by a system of
ultracold bosons in a periodic optical superlattice using the mean field
decoupling approximation. We investigate for a wide range of commensurate and
incommensurat... | cond-mat_quant-gas |
Two component quantum walk in one-dimensional lattice with hopping
imbalance: We investigate the two-component quantum walk in one-dimensional lattice. We
show that the inter-component interaction strength together with the hopping
imbalance between the components exhibit distinct features in the quantum walk
for dif... | cond-mat_quant-gas |
Universal van der Waals Force Between Heavy Polarons in Superfluids: We investigate the long-range behavior of the induced Casimir interaction
between two spinless heavy impurities, or polarons, in superfluid cold atomic
gases. With the help of effective field theory (EFT) of a Galilean invariant
superfluid, we show th... | cond-mat_quant-gas |
Semiclassical Hartree-Fock theory of a rotating Bose-Einstein
condensation: In this paper, we investigate the thermodynamic behavior of a rotating
Bose-Einstein condensation with non-zero interatomic interactions
theoretically. The analysis relies on a semiclassical Hartree-Fock
approximation where an integral is per... | cond-mat_quant-gas |
Thermalisation of Local Observables in Small Hubbard Lattices: We present a study of thermalisation of a small isolated Hubbard lattice
cluster prepared in a pure state with a well-defined energy. We examine how a
two-site subsystem of the lattice thermalises with the rest of the system as
its environment. We explore n... | cond-mat_quant-gas |
Synthetic Gauge Fields for Ultra Cold Atoms: A Primer: We start by reviewing the concept of gauge invariance in quantum mechanics,
for Abelian and Non-Ableian cases. Then we idescribe how the various gauge
potential and field can be associated with the geometrical phase acquired by a
quantum mechanical wave function wh... | cond-mat_quant-gas |
Experimental realization of a high precision tunable hexagonal optical
lattice: Hexagonal optical lattices offer a tunable platform to study exotic orbital
physics in solid state materials. Here, we present a versatile high-precision
scheme to implement a hexagonal optical lattice potential, which is engineered
by ov... | cond-mat_quant-gas |
A Non-Equilibrium Kinetic Theory for Trapped Binary Condensates: We derive a non-equilibrium finite-temperature kinetic theory for a binary
mixture of two interacting atomic Bose-Einstein condensates and use it to
explore the degree of hydrodynamicity attainable in realistic experimental
geometries. Based on the standa... | cond-mat_quant-gas |
Dynamics of matter-wave solutions of Bose-Einstein condensates in a
homogeneous gravitational field: We find a matter-wave solution of Bose-Einstein condensates trapped in a
harmonic-oscillator potential and subjected to a homogeneous gravitational
field, by means of the extended tanhfunction method. This solution ha... | cond-mat_quant-gas |
Collective dynamical Fermi suppression of optically-induced inelastic
scattering: We observe strong dynamical suppression of optically-induced loss in a weakly
interacting Fermi gas as the $s$-wave scattering length is increased. The
single, cigar-shaped cloud behaves as a large spin lattice in energy space with
a tu... | cond-mat_quant-gas |
Attractive Solution of Binary Bose Mixtures: Liquid-Vapor Coexistence
and Critical Point: We study the thermodynamic behavior of attractive binary Bose mixtures using
exact path-integral Monte-Carlo methods. Our focus is on the regime of
interspecies interactions where the ground state is in a self-bound liquid
phase... | cond-mat_quant-gas |
Fermionization of two-component few-fermion systems in a one-dimensional
harmonic trap: The nature of strongly interacting Fermi gases and magnetism is one of the
most important and studied topics in condensed-matter physics. Still, there are
many open questions. A central issue is under what circumstances strong
sho... | cond-mat_quant-gas |
Quantum Monte Carlo Study of a Resonant Bose-Fermi Mixture: We study a resonant Bose-Fermi mixture at zero temperature by using the
fixed-node diffusion Monte Carlo method. We explore the system from weak to
strong boson-fermion interaction, for different concentrations of the bosons
relative to the fermion component. ... | cond-mat_quant-gas |
Frustrated quantum antiferromagnetism with ultracold bosons in a
triangular lattice: We propose to realize the anisotropic triangular-lattice Bose-Hubbard model
with positive tunneling matrix elements by using ultracold atoms in an optical
lattice dressed by a fast lattice oscillation. This model exhibits frustrated
... | cond-mat_quant-gas |
Floquet-heating-induced Bose condensation in a scar-like mode of an open
driven optical-lattice system: Periodically driven quantum systems suffer from heating via resonant
excitation. While such Floquet heating guides a generic isolated system towards
the infinite-temperature state, a driven open system, coupled to ... | cond-mat_quant-gas |
Self-bound Bose mixtures: Recent experiments confirmed that fluctuations beyond the mean-field
approximation can lead to self-bound liquid droplets of ultra-dilute binary
Bose mixtures. We proceed beyond the beyond-mean-field approximation, and study
liquid Bose mixtures using the variational hypernetted-chain Euler La... | cond-mat_quant-gas |
Trimer quantum spin liquid in a honeycomb array of Rydberg atoms: Quantum spin liquids are elusive but paradigmatic examples of strongly
correlated quantum states that are characterized by long-range quantum
entanglement. Recently, the direct signatures of a gapped topological
$\mathbb{Z}_2$ spin liquid have been obser... | cond-mat_quant-gas |
Reply to the Comment on "Berezinskii-Kosterlitz-Thouless Transition in
Two-Dimensional Dipolar Stripes": This is a Reply to the Comment from F. Cinti and M. Boninsegni on our recent
work on the Berezinskii-Kosterlitz-Thouless (BKT) phase transition in a
two-dimensional dipolar system [R.Bomb\'in, F. Mazzanti and J. B... | cond-mat_quant-gas |
Macroscopic boundary effects in the one-dimensional extended
Bose-Hubbard model: We study the effect of different open boundary conditions on the insulating
ground states of the one-dimensional extended Bose-Hubbard model at and near
unit filling. To this end, we employ the density matrix renormalization group
method... | cond-mat_quant-gas |
Quantum fluctuation induced time of flight correlations of an
interacting trapped Bose gas: We investigate numerically the momentum correlations in a two dimensional,
harmonically trapped interacting Bose system at $T=0$ temperature, by using a
particle number preserving Bogoliubov approximation. Interaction induced
... | cond-mat_quant-gas |
Faraday waves on a bubble Bose-Einstein condensed binary mixture: By studying the dynamic stability of Bose-Einstein condensed binary mixtures
trapped on the surface of an ideal two-dimensional spherical bubble, we show
how the Rabi coupling between the species can modulate the interactions leading
to parametric resona... | cond-mat_quant-gas |
Superfluidity of Bose-Einstein condensates in toroidal traps with
nonlinear lattices: Superfluid properties of Bose-Einstein condensates (BEC) in toroidal
quasi-one-dimensional traps are investigated in the presence of periodic
scattering length modulations along the ring. The existence of several types of
stable per... | cond-mat_quant-gas |
Thermodynamic engine with a quantum degenerate working fluid: Can quantum mechanical thermodynamic engines outperform their classical
counterparts? To address one aspect of this question, we experimentally realize
and characterize an isentropic thermodynamic engine that uses a Bose-condensed
working fluid. In this engi... | cond-mat_quant-gas |
One Dimensional 1H, 2H and 3H: The ground-state properties of one-dimensional electron-spin-polarized
hydrogen $^1$H, deuterium $^2$H, and tritium $^3$H are obtained by means of
quantum Monte Carlo methods. The equations of state of the three isotopes are
calculated for a wide range of linear densities. The pair correl... | cond-mat_quant-gas |
Measuring topology in a laser-coupled honeycomb lattice: From Chern
insulators to topological semi-metals: Ultracold fermions trapped in a honeycomb optical lattice constitute a
versatile setup to experimentally realize the Haldane model [Phys. Rev. Lett.
61, 2015 (1988)]. In this system, a non-uniform synthetic magn... | cond-mat_quant-gas |
Measure synchronization in quantum many-body systems: The concept of measure synchronization between two coupled quantum many-body
systems is presented. In general terms we consider two quantum many-body
systems whose dynamics gets coupled through the contact particle-particle
interaction. This coupling is shown to pro... | cond-mat_quant-gas |
Impact of photo-assisted collisions on superradiant light scattering
with Bose condensates: We present experimental evidence supporting the postulation that the
secondary effects of light-assisted collisions are the main reason that the
superradiant light scattering efficiency in condensates is asymmetric with
respec... | cond-mat_quant-gas |
Quantum Monte Carlo study of ultracold gases (PhD thesis): This Dissertation presents results of a thorough study of ultracold bosonic
and fermionic gases in three-dimensional and quasi-one-dimensional systems.
Although the analyses are carried out within various theoretical frameworks
(Gross-Pitaevskii, Bethe ansatz, ... | cond-mat_quant-gas |
Many-body Aharonov-Bohm caging in a lattice of rings: We study a system of a few ultracold bosons loaded into the states with
orbital angular momentum $l=1$ of a one-dimensional staggered lattice of rings.
Local eigenstates with winding numbers $+l$ and $-l$ form a Creutz ladder with
a real dimension and a synthetic on... | cond-mat_quant-gas |
Prethermalization in the cooling dynamics of an impurity in a BEC: We discuss the cooling dynamics of heavy impurity atoms in a Bose-Einstein
condensate (BEC) by emission of Cherenkov phonons from scattering with the
condensate. In a weakly interacting, low-temperature condensate the
superfluidity of the condensate res... | cond-mat_quant-gas |
Pair condensation of polarized fermions in the BCS-BEC crossover: We investigate a two-component Fermi gas with unequal spin populations along
the BCS-BEC crossover. By using the extended BCS equations and the concept of
off-diagonal-long-range-order we derive a formula for the condensate number of
Cooper pairs as a fu... | cond-mat_quant-gas |
One-dimensional Bose-Einstein condensation of photons in a microtube: This paper introduces a quasiequilibrium one-dimensional Bose-Einstein
condensation of photons trapped in a microtube. Light modes with a cut-off
frequency (a photon's "mass") interact through different processes of
absorption, emission, and scatteri... | cond-mat_quant-gas |
Detection of coherent superpositions of phase states by full counting
statistics in a Bose Josephson junction: For a Bose Josephson junction realized with a double-well potential we
propose a strategy to observe the coherent superpositions of phase states
occurring during the time evolution after a sudden rise of the... | cond-mat_quant-gas |
Probing the Hall Voltage in Synthetic Quantum Systems: In the context of experimental advances in the realization of artificial
magnetic fields in quantum gases, we discuss feasible schemes to extend
measurements of the Hall polarization to a study of the Hall voltage, allowing
for direct comparison with solid state sy... | cond-mat_quant-gas |
FACt: FORTRAN toolbox for calculating fluctuations in atomic condensates: We develop a FORTRAN code to compute fluctuations in atomic condensates
(FACt) by solving the Bogoliubov-de Gennes (BdG) equations for two component
Bose-Einstein condensate (TBEC) in quasi two dimensions. The BdG equations are
recast as matrix e... | cond-mat_quant-gas |
Dissipative Distillation of Supercritical Quantum Gases: We experimentally realize a method to produce non-equilibrium Bose Einstein
condensates with condensed fraction exceeding those of equilibrium samples with
the same parameters. To do this, we immerse an ultracold Bose gas of 87Rb in a
cloud of 39K with substantia... | cond-mat_quant-gas |
Emergent Quasicrystalline Symmetry in Light-Induced Quantum Phase
Transitions: The discovery of quasicrystals with crystallographically forbidden rotational
symmetries has changed the notion of the ordering in materials, yet little is
known about the dynamical emergence of such exotic forms of order. Here we
theoreti... | cond-mat_quant-gas |
Floquet Dynamical Decoupling at Zero Bias: Dynamical decoupling (DD) is an efficient method to decouple systems from
environmental noises and to prolong the coherence time of systems. In contrast
to discrete and continuous DD protocols in the presence of bias field, we
propose a Floquet DD at zero bias to perfectly sup... | cond-mat_quant-gas |
Field-induced topological pair-density wave states in a multilayer
optical lattice: We study the superfluid phases of a Fermi gas in a multilayer optical lattice
system in the presence of out-of-plane Zeeman field, as well as spin-orbit (SO)
coupling. We show that the Zeeman field combined with the SO coupling leads ... | cond-mat_quant-gas |
Phase Transitions in Three-Dimensional Bosonic Systems in Optical
Lattices: We formulate the Collective Quantum Field Theory for three-dimensional
bosonic optical lattices and evaluate its consequences in a mean-field
approximation to two collective fields, proposed by Fred Cooper et al. and in a
lowest-order Variati... | cond-mat_quant-gas |
Quench between a Mott insulator and a Lieb-Liniger liquid: In this work we study a quench between a Mott insulator and a repulsive
Lieb-Liniger liquid. We find explicitly the stationary state when a long time
has passed after the quench. It is given by a GGE density matrix which we
completely characterize, calculating ... | cond-mat_quant-gas |
The optimal frequency window for Floquet engineering in optical lattices: The concept of Floquet engineering is to subject a quantum system to
time-periodic driving in such a way that it acquires interesting novel
properties. It has been employed, for instance, for the realization of
artificial magnetic fluxes in optic... | cond-mat_quant-gas |
Miscibility in coupled dipolar and non-dipolar Bose-Einstein condensates: We perform a full three-dimensional study on miscible-immiscible conditions
for coupled dipolar and non-dipolar Bose-Einstein condensates (BEC), confined
within anisotropic traps. Without loosing general miscibility aspects that can
occur for two... | cond-mat_quant-gas |
Quantum Melting of a Wigner crystal of Rotating Dipolar Fermions in the
Lowest Landau Level: We have investigated the behavior and stability of a Wigner crystal of
rotating dipolar fermions in two dimensions. Using an ansatz wave function for
the ground state of rotating two-dimensional dipolar fermions, which occupy... | cond-mat_quant-gas |
Dissipative nonlinear waves in a gravitating quantum fluid: Nonlinear wave propagation is studied analytically in a dissipative,
self-gravitating Bose Einstein condensate, in the framework of Gross-Pitaevskii
model. The linear dispersion relation shows that the effect of dissipation is
to suppress dynamical instabiliti... | cond-mat_quant-gas |
Viscosity of strongly interacting quantum fluids: spectral functions and
sum rules: The viscosity of strongly interacting systems is a topic of great interest in
diverse fields.
We focus here on the bulk and shear viscosities of \emph{non-relativistic}
quantum fluids, with particular emphasis on strongly interactin... | cond-mat_quant-gas |
Ramsey interferometry of non-Hermitian quantum impurities: We introduce a Ramsey pulse scheme which extracts the non-Hermitian
Hamiltonian associated to an arbitrary Lindblad dynamics. We propose a realted
protocol to measure via interferometry a generalised Loschmidt echo of a
generic state evolving in time with the n... | cond-mat_quant-gas |
Chirp Control of Sinusoidal Lattice Modes in Bose-Einstein Condensate: A parametrically forced Bose-Einstein condensate (BEC) is studied in the mean
field approach for the case of a general moving optical lattice. The
interaction between the atoms in the condensate and the time dependent lattice
potential leads to a no... | cond-mat_quant-gas |
Quantum Fluctuation Driven First-order Phase Transitions in Optical
Lattices: We study quantum fluctuation driven first-order phase transitions of a
two-species bosonic system in a three-dimensional optical lattice. Using
effective potential method we find that the superfluid-Mott insulator phase
transition of one ty... | cond-mat_quant-gas |
From few to many bosons inside the unitary window: a transition between
universal to non-universal behavior: Universal behaviour in few-bosons systems close to the unitary limit, where
two bosons become unbound, has been intensively investigated in recent years
both experimentally and theoretically. In this particula... | cond-mat_quant-gas |
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