text stringlengths 89 2.49k | category stringclasses 19
values |
|---|---|
Non-Hermitian Stark Many-Body Localization: Utilizing exact diagonalization (ED) techniques, we investigate a
one-dimensional, non-reciprocal, interacting hard-core boson model under a
Stark potential with tail curvature. By employing the non-zero imaginary
eigenenergies ratio, half-chain entanglement entropy, and eige... | cond-mat_quant-gas |
Thermodynamics of Trapped Photon Gases at Dimensional Crossover from 2D
to 1D: Photon Bose-Einstein condensates are characterised by a quite weak
interaction, so they behave nearly as an ideal Bose gas. Moreover, since the
current experiments are conducted in a microcavity, the longitudinal motion is
frozen out and t... | cond-mat_quant-gas |
Current-Phase Relation of a Bose-Einstein Condensate Flowing Through a
Weak Link: We study the current-phase relation of a Bose-Einstein condensate flowing
through a repulsive square barrier by solving analytically the one dimensional
Gross-Pitaevskii equation. The barrier height and width fix the current-phase
relat... | cond-mat_quant-gas |
Birth of a quasi-stationary black hole in an outcoupled Bose-Einstein
condensate: We study the evolution of an initially confined atom condensate which is
progressively outcoupled by gradually lowering the confining barrier on one
side. The goal is to identify protocols that best lead to a quasi-stationary
sonic blac... | cond-mat_quant-gas |
Energy spectrum of harmonically trapped two-component Fermi gases:
Three- and Four-Particle Problem: Trapped two-component Fermi gases allow for the investigation of the
so-called BCS-BEC crossover by tuning the interspecies atom-atom $s$-wave
scattering length scattering $a^{(aa)}$ from attractive to repulsive, incl... | cond-mat_quant-gas |
Strongly Interacting Atom Lasers in Three Dimensional Optical Lattices: We show that the dynamical melting of a Mott insulator in a three-dimensional
lattice leads to condensation at nonzero momenta, a phenomenon that can be used
to generate strongly interacting atom lasers in optical lattices. For infinite
onsite repu... | cond-mat_quant-gas |
Drag in Bose-Fermi Mixtures: We use kinetic theory to model the dynamics of a small Bose condensed cloud
of heavy particles moving through a larger degenerate Fermi gas of light
particles. Varying the Bose-Fermi interaction, we find a crossover between bulk
and surface dominated regimes -- where scattering occurs throu... | cond-mat_quant-gas |
Analysis and resolution of the ground-state degeneracy of the
two-component Bose-Hubbard model: We study the degeneracy of the ground-state energy $E$ of the two-component
Bose-Hubbard model and of the perturbative correction $E_1$. We show that the
degeneracy properties of $E$ and $E_1$ are closely related to the co... | cond-mat_quant-gas |
Conformal-invariance of 2D quantum turbulence in an exciton-polariton
fluid of light: The similarities of quantum turbulence with classical hydrodynamics allow
quantum fluids to provide essential models of their classical analogue, paving
the way for fundamental advances in physics and technology. Recently,
experimen... | cond-mat_quant-gas |
Quantum phases from competing short- and long-range interactions in an
optical lattice: Insights into complex phenomena in quantum matter can be gained from
simulation experiments with ultracold atoms, especially in cases where
theoretical characterization is challenging. However these experiments are
mostly limited ... | cond-mat_quant-gas |
The role of atomic interactions in cavity-induced continuous time
crystals: We consider continuous time-crystalline phases in dissipative many-body
systems of atoms in cavities, focusing on the role of short-range interatomic
interactions. First, we show that the latter can alter the nature of the time
crystal by cha... | cond-mat_quant-gas |
Correlation properties of a one-dimensional repulsive Bose gas at finite
temperature: We present a comprehensive study shedding light on how thermal fluctuations
affect correlations in a Bose gas with contact repulsive interactions in one
spatial dimension. The pair correlation function, the static structure factor,
... | cond-mat_quant-gas |
Light-induced gauge fields for ultracold atoms: Gauge fields are central in our modern understanding of physics at all
scales. At the highest energy scales known, the microscopic universe is
governed by particles interacting with each other through the exchange of gauge
bosons. At the largest length scales, our univers... | cond-mat_quant-gas |
BCS-BEC crossover in a quasi-two-dimensional Fermi gas: We consider a two-component gas of fermionic atoms confined to a
quasi-two-dimensional (quasi-2D) geometry by a harmonic trapping potential in
the transverse direction. We construct a mean field theory of the BCS-BEC
crossover at zero temperature that allows us to... | cond-mat_quant-gas |
On Berezinskii-Kosterlitz-Thouless Phase Transition in Quasi-One
Dimensional Bose-Einstein Condensate: We show that quasi-one dimensional Bose-Einstein condensate under suitable
conditions can exhibit a Berezinskii-Kosterlitz-Thouless phase transition. The
role played by quantized vortices in two dimensional case, is... | cond-mat_quant-gas |
Bose-Einstein condensates in an eightfold symmetric optical lattice: We investigate the properties of Bose-Einstein condensates (BECs) in a
two-dimensional quasi-periodic optical lattice (OL) with eightfold rotational
symmetry by numerically solving the Gross-Pitaevskii equation. In a stationary
external harmonic trapp... | cond-mat_quant-gas |
Floquet operator engineering for quantum state stroboscopic
stabilization: Optimal control is a valuable tool for quantum simulation, allowing for the
optimized preparation, manipulation, and measurement of quantum states. Through
the optimization of a time-dependent control parameter, target states can be
prepared t... | cond-mat_quant-gas |
Tailoring quantum gases by Floquet engineering: Floquet engineering is the concept of tailoring a system by a periodic drive.
It has been very successful in opening new classes of Hamiltonians to the study
with ultracold atoms in optical lattices, such as artificial gauge fields,
topological band structures and density... | cond-mat_quant-gas |
Interaction-Enhanced Group Velocity of Bosons in the Flat Band of an
Optical Kagome Lattice: Geometric frustration of particle motion in a kagome lattice causes the
single-particle band structure to have a flat s-orbital band. We probe this
band structure by exciting a Bose-Einstein condensate into excited Bloch stat... | cond-mat_quant-gas |
Charge Gaps at Fractional Fillings in Boson Hubbard Ladders: The Bose-Hubbard Hamiltonian describes the competition between superfluidity
and Mott insulating behavior at zero temperature and commensurate filling as
the strength of the on-site repulsion is varied. Gapped insulating phases also
occur at non-integer densi... | cond-mat_quant-gas |
Quantum annealing for the number partitioning problem using a tunable
spin glass of ions: Exploiting quantum properties to outperform classical ways of
information-processing is an outstanding goal of modern physics. A promising
route is quantum simulation, which aims at implementing relevant and
computationally hard... | cond-mat_quant-gas |
Mean-field phase diagram of the 1-D Bose gas in a disorder potential: We study the quantum phase transition of the 1D weakly interacting Bose gas
in the presence of disorder. We characterize the phase transition as a function
of disorder and interaction strengths, by inspecting the long-range behavior of
the one-body d... | cond-mat_quant-gas |
Phase diagrams and multistep condensations of spin-1 bosonic gases in
optical lattices: Motivated by recent experimental processes, we systemically investigate
strongly correlated spin-1 ultracold bosons trapped in a three-dimensional
optical lattice in the presence of an external magnetic field. Based on a
recently ... | cond-mat_quant-gas |
Time crystals: analysis of experimental conditions: Time crystals are quantum many-body systems which are able to self-organize
their motion in a periodic way in time. Discrete time crystals have been
experimentally demonstrated in spin systems. However, the first idea of
spontaneous breaking of discrete time translati... | cond-mat_quant-gas |
Resonant light enhances phase coherence in a cavity QED simulator of
fermionic superfluidity: Cavity QED experiments are natural hosts for non-equilibrium phases of matter
supported by photon-mediated interactions. In this work, we consider a cavity
QED simulation of the BCS model of superfluidity, by studying regime... | cond-mat_quant-gas |
Bogoliubov-Cherenkov Radiation in an Atom Laser: We develop a simple yet powerful technique to study Bogoliubov-Cherenkov
radiation by producing a pulsed atom laser from a strongly confined
Bose-Einstein condensate. Such radiation results when the atom laser pulse
falls past a Bose-Einstein condensate at high-hypersoni... | cond-mat_quant-gas |
Spinor Condensates on a Cylindrical Surface in Synthetic Gauge Fields: We point out that by modifying the setup of a recent experiment that
generates a Dirac string, one can create a quasi 2D spinor Bose condensate on a
cylindrical surface with a synthetic magnetic field pointing radially outward
from the cylindrical s... | cond-mat_quant-gas |
Effect of an Impurity on Grey Soliton Dynamics in Cigar-Shaped
Bose-Einstein Condensate: In a cigar shaped Bose-Einstein condensate, explicit solutions of the coupled
mean-field equations, describing defect-grey soliton dynamics are obtained,
demonstrating the coexistence of grey soliton and a localized defect. Unlik... | cond-mat_quant-gas |
Realizing the entanglement Hamiltonian of a topological quantum Hall
system: Topological quantum many-body systems, such as Hall insulators, are
characterized by a hidden order encoded in the entanglement between their
constituents. Entanglement entropy, an experimentally accessible single number
that globally quanti... | cond-mat_quant-gas |
Interacting Fermionic Atoms in Optical Lattices Diffuse Symmetrically
Upwards and Downwards in a Gravitational Potential: We consider a cloud of fermionic atoms in an optical lattice described by a
Hubbard model with an additional linear potential. While homogeneous
interacting systems mainly show damped Bloch oscill... | cond-mat_quant-gas |
Stable dilute supersolid of two-dimensional dipolar bosons: We consider two-dimensional bosonic dipoles oriented perpendicularly to the
plane. On top of the usual two-body contact and long-range dipolar interactions
we add a contact three-body repulsion as expected, in particular, for dipoles
in the bilayer geometry wi... | cond-mat_quant-gas |
Quantized conductance through a spin-selective atomic point contact: We implement a microscopic spin filter for cold fermionic atoms in a quantum
point contact (QPC) and create fully spin-polarized currents while retaining
conductance quantization. Key to our scheme is a near-resonant optical tweezer
inducing a large e... | cond-mat_quant-gas |
Self-Assembled Chains and Solids of Dipolar Atoms in a Multilayer: We predict that ultracold bosonic dipolar gases, confined within a multilayer
geometry, may undergo self-assembling processes, leading to the formation of
chain gases and solids. These dipolar chains, with dipoles aligned across
different layers, emerge... | cond-mat_quant-gas |
Matter wave switching in Bose-Einstein condensates via intensity
redistribution soliton interactions: Using time dependent nonlinear (s-wave scattering length) coupling between
the components of a weakly interacting two component Bose-Einstein condensate
(BEC), we show the possibility of matter wave switching (fracti... | cond-mat_quant-gas |
Preparing and probing Chern bands with cold atoms: The present Chapter discusses methods by which topological Bloch bands can be
prepared in cold-atom setups. Focusing on the case of Chern bands for
two-dimensional systems, we describe how topological properties can be
triggered by driving atomic gases, either by dress... | cond-mat_quant-gas |
Level statistics of the one-dimensional ionic Hubbard model: In this work we analyze the spectral level statistics of the one-dimensional
ionic Hubbard model, the Hubbard model with an alternating on-site potential.
In particular, we focus on the statistics of the gap ratios between consecutive
energy levels. This quan... | cond-mat_quant-gas |
Bound Bogoliubov quasiparticles in photon superfluids: Bogoliubov's description of Bose gases relies on the linear dynamics of
noninteracting quasiparticles on top of a homogeneous condensate. Here, we
theoretically explore the weakly-nonlinear regime of a one-dimensional photon
superfluid in which phonon-like elementa... | cond-mat_quant-gas |
Spin Orbit Coupling in Periodically Driven Optical Lattices: We propose a method for the emulation of artificial spin orbit coupling in a
system of ultracold, neutral atoms trapped in a tight-binding lattice. This
scheme does not involve near-resonant laser fields, avoiding the heating
processes connected to the sponta... | cond-mat_quant-gas |
Persistent Currents in Ferromagnetic Condensates: Persistent currents in Bose condensates with a scalar order parameter are
stabilized by the topology of the order parameter manifold. In condensates with
multicomponent order parameters it is topologically possible for supercurrents
to `unwind' without leaving the manif... | cond-mat_quant-gas |
Higgs-like Excitations of Cold Atom System with Spin-orbit Coupling: The Higgs-like excitations, which distinguish from the Higgs amplitude mode
in many-body system, are single-particle excitations in system with non-Abelian
gauge potential. We investigate the Higgs-like excitations of cold atom system
in artificial no... | cond-mat_quant-gas |
Collective many-body bounce in the breathing-mode oscillations of a
Tonks-Girardeau gas: We analyse the breathing-mode oscillations of a harmonically quenched
Tonks-Giradeau (TG) gas using an exact finite-temperature dynamical theory. We
predict a striking collective manifestation of impenetrability---a collective
ma... | cond-mat_quant-gas |
Self-consistent Keldysh approach to quenches in weakly interacting
Bose-Hubbard model: We present a non-equilibrium Green's functional approach to study the
dynamics following a quench in weakly interacting Bose Hubbard model (BHM). The
technique is based on the self-consistent solution of a set of equations which
re... | cond-mat_quant-gas |
Generation of spin currents by a temperature gradient in a two-terminal
device: Theoretical and experimental studies of the interaction between spins and
temperature are vital for the development of spin caloritronics, as they
dictate the design of future devices. In this work, we propose a two-terminal
cold-atom sim... | cond-mat_quant-gas |
Quantum phases of atomic Fermi gases with anisotropic spin-orbit
coupling: We consider a general anisotropic spin-orbit coupling (SOC) and analyze the
phase diagrams of both balanced and imbalanced Fermi gases for the entire
BCS--Bose-Einstein condensate (BEC) evolution. In the first part, we use the
self-consistent ... | cond-mat_quant-gas |
Structure of Spin Correlations in High Temperature SU($N$) Quantum
Magnets: Quantum magnets with a large SU($N$) symmetry are a promising playground for
the discovery of new forms of exotic quantum matter. Motivated by recent
experimental efforts to study SU($N$) quantum magnetism in samples of ultracold
fermionic al... | cond-mat_quant-gas |
Large-$N$ expansion for condensation and stability of Bose-Bose mixtures
at finite temperatures: The two-component mixture of Bose particles with short-range pairwise
interaction at finite temperatures in three dimensions is considered.
Particularly we examine, by means of the large-$N$ expansion technique, the
stabi... | cond-mat_quant-gas |
Forming doublons by a quantum quench: Repulsive interactions between particles on a lattice may lead to bound
states, so called doublons. Such states may be created by dynamically tuning
the interaction strength, e.g. using a Feshbach resonance, from attraction to
repulsion. We study the doublon production efficiency a... | cond-mat_quant-gas |
Simulation of the many-body dynamical quantum Hall effect in an optical
lattice: We propose an experimental scheme to simulate the many-body dynamical quantum
Hall effect with ultra-cold bosonic atoms in a one-dimensional optical lattice.
We first show that the required model Hamiltonian of a spin-1/2 Heisenberg
chai... | cond-mat_quant-gas |
BCS-BEC crossover and quantum phase transition in an ultracold Fermi gas
under spin-orbit coupling: In this work, we study the BCS-BEC crossover and quantum phase transition in
a Fermi gas under Rashba spin-orbit coupling close to a Feshbach resonance. By
adopting a two-channel model, we take into account of the clos... | cond-mat_quant-gas |
Current production in ring condensates with a weak link: We consider attractive and repulsive condensates in a ring trap stirred by a
weak link, and analyze the spectrum of solitonic trains dragged by the link, by
means of analytical expressions for the wave functions, energies and currents.
The precise evolution of cu... | cond-mat_quant-gas |
Hydrodynamic description of Hard-core Bosons on a Galileo ramp: We study the quantum evolution of a cloud of hard-core bosons loaded on a
one-dimensional optical lattice after its sudden release from a harmonic trap.
Just after the trap has been removed, a linear ramp potential is applied,
mimicking the so called Galil... | cond-mat_quant-gas |
Partial Fermionization---Spectral Universality in 1D Repulsive Bose
Gases: Due to the vast growth of the many-body level density with excitation energy,
its smoothed form is of central relevance for spectral and thermodynamic
properties of interacting quantum systems. We compute the cumulative of this
level density f... | cond-mat_quant-gas |
Self-similar non-equilibrium dynamics of a many-body system with
power-law interactions: The influence of power-law interactions on the dynamics of many-body systems
far from equilibrium is much less explored than their effect on static and
thermodynamic properties. To gain insight into this problem we introduce and
... | cond-mat_quant-gas |
Proposal to directly observe the Kondo effect through enhanced
photo-induced scattering of cold fermionic and bosonic atoms: We propose an experimental protocol to directly observe the Kondo effect by
scattering ultracold atoms with spin-dependent interactions. We propose using
an optical Feshbach resonance to engine... | cond-mat_quant-gas |
Thermodynamics of Attractive and Repulsive Fermi Gases in Two Dimensions: We study the attractive and repulsive two-component Fermi gas with spin
imbalance in two dimensions. Using a generalized $T$-matrix approximation, we
examine the thermodynamic properties of both attractive and repulsive contact
interacting Fermi ... | cond-mat_quant-gas |
Numerical Studies of Quantum Turbulence: We review numerical studies of quantum turbulence. Quantum turbulence is
currently one of the most important problems in low temperature physics and is
actively studied for superfluid helium and atomic Bose--Einstein condensates. A
key aspect of quantum turbulence is the dynamic... | cond-mat_quant-gas |
Deformation Dependence of Breathing Oscillations in Bose - Fermi
Mixtures at Zero Temperature: We study the breathing oscillations in bose-fermi mixtures in the
axially-symmetric deformed trap of prolate, spherical and oblate shapes, and
clarify the deformation dependence of the frequencies and the characteristics
of... | cond-mat_quant-gas |
Emergent spacetimes from Hermitian and non-Hermitian quantum dynamics: We show that quantum dynamics of any systems with $SU(1,1)$ symmetry give
rise to emergent Anti-de Sitter spacetimes in 2+1 dimensions (AdS$_{2+1}$).
Using the continuous circuit depth, a quantum evolution is mapped to a
trajectory in AdS$_{2+1}$. W... | cond-mat_quant-gas |
Hard-core bosons in flat band systems above the critical density: We investigate the behaviour of hard-core bosons in one- and two-dimensional
flat band systems, the chequerboard and the kagom\'e lattice and
one-dimensional analogues thereof. The one dimensional systems have an exact
local reflection symmetry which all... | cond-mat_quant-gas |
Observation of $1/k^4$-tails after expansion of Bose-Einstein
Condensates with impurities: We measure the momentum density in a Bose-Einstein condensate (BEC) with
dilute spin impurities after an expansion in the presence of interactions. We
observe tails decaying as $1/k^4$ at large momentum $k$ in the condensate an... | cond-mat_quant-gas |
Interactions and scattering of quantum vortices in a polariton fluid: Quantum vortices, the quantized version of classical vortices, play a
prominent role in superfluid and superconductor phase transitions. However,
their exploration at a particle level in open quantum systems has gained
considerable attention only rec... | cond-mat_quant-gas |
Strong Boundary and Trap Potential Effects on Emergent Physics in
Ultra-Cold Fermionic Gases: The field of quantum simulations in ultra-cold atomic gases has been
remarkably successful. In principle it allows for an exact treatment of a
variety of highly relevant lattice models and their emergent phases of matter.
Bu... | cond-mat_quant-gas |
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 |
Energy spectra and fluxes of turbulent rotating Bose-Einstein
condensates in two dimensions: We investigate the scaling of the energy cascade in a harmonically trapped,
turbulent, rotating Bose-Einstein condensate (BEC) in two dimensions. We
achieve turbulence by injecting a localized perturbation into the condensate... | cond-mat_quant-gas |
Tools for designing atom interferometers in a microgravity environment: We present a variational model suitable for rapid preliminary design of atom
interferometers in a microgravity environment. The model approximates the
solution of the 3D rotating--frame Gross--Pitaevskii equation (GPE) as the sum
of Nc Gaussian clo... | cond-mat_quant-gas |
Motion of a Solitonic Vortex in the BEC-BCS Crossover: We observe a long-lived solitary wave in a superfluid Fermi gas of $^6$Li
atoms after phase-imprinting. Tomographic imaging reveals the excitation to be
a solitonic vortex, oriented transverse to the long axis of the cigar-shaped
atom cloud. The precessional motion... | cond-mat_quant-gas |
Phase space theory of Bose-Einstein condensates and time-dependent modes: A phase space theory approach for treating dynamical behaviour of
Bose-Einstein condensates applicable to situations such as interferometry with
BEC in time-dependent double well potentials is presented. Time-dependent mode
functions are used, ch... | cond-mat_quant-gas |
Quantum Fluctuations of Vortex Lattices in Ultracold Gases: We discuss the effects of quantum fluctuations on the properties of vortex
lattices in rapidly rotating ultracold atomic gases. We develop a variational
method that goes beyond the Bogoliubov theory by including the effects of
interactions between the quasipar... | cond-mat_quant-gas |
Observation of Stückelberg oscillations in accelerated optical
lattices: We report the experimental observation of St\"{u}ckelberg oscillations of
matter waves in optical lattices. Extending previous work on Landau-Zener
tunneling of Bose-Einstein condensates in optical lattices, we study the
effects of the accumulat... | cond-mat_quant-gas |
Observing Properties of an Interacting Homogeneous Bose--Einstein
Condensate: Heisenberg-Limited Momentum Spread, Interaction Energy and
Free-Expansion Dynamics: We study the properties of an atomic Bose--Einstein condensate produced in an
optical-box potential, using high-resolution Bragg spectroscopy. For a range... | cond-mat_quant-gas |
Intersubband Polaritons in the Electrical Dipole Gauge: We provide a theoretical description for the coupling between the
intersubband excitations of a bi-dimensional electron gas with the
electromagnetic field. This description, based on the electrical dipole gauge,
applies to an arbitrary quantum heterostructure embe... | cond-mat_quant-gas |
The Anyon Hubbard Model in One-Dimensional Optical Lattices: Raman-assisted hopping may be used to realize the anyon Hubbard model in
one-dimensional optical lattices. We propose a feasible scenario that
significantly improves the proposal of [T. Keilmann et al., Nature Commun. 2,
361 (2011)], allowing as well for an e... | cond-mat_quant-gas |
Instabilities of vortex-ring-bright soliton in trapped binary 3D
Bose-Einstein condensates: Instabilities of vortex-ring-bright coherent structures in harmonically
trapped two-component three-dimensional Bose-Einstein condensates are studied
numerically within the coupled Gross-Pitaevskii equations and interpreted
an... | cond-mat_quant-gas |
Coherent molecule formation in anharmonic potentials near
confinement-induced resonances: We perform a theoretical and experimental study of a system of two ultracold
atoms with tunable interaction in an elongated trapping potential. We show that
the coupling of center-of-mass and relative motion due to an anharmonic... | cond-mat_quant-gas |
Periodic waves in two-component Bose-Einstein condensates with repulsive
interactions between atoms: We consider periodic waves in miscible two-component Bose-Einstein
condensates with repulsive nonlinear interactions constants. Exact one-phase
solution is found for the case when all these constants are equal to each... | cond-mat_quant-gas |
The Efimov effect for heteronuclear three-body systems at positive
scattering length and finite temperature: We study the recombination process of three atoms scattering into an atom and
diatomic molecule in heteronuclear mixtures of ultracold atomic gases with
large and positive interspecies scattering length at fin... | cond-mat_quant-gas |
Momentum-space Harper-Hofstadter model: We show how the weakly trapped Harper-Hofstadter model can be mapped onto a
Harper-Hofstadter model in momentum space. In this momentum-space model, the
band dispersion plays the role of the periodic potential, the Berry curvature
plays the role of an effective magnetic field, th... | cond-mat_quant-gas |
Collective excitation frequencies and stationary states of trapped
dipolar Bose-Einstein condensates in the Thomas-Fermi regime: We present a general method for obtaining the exact static solutions and
collective excitation frequencies of a trapped Bose-Einstein condensate (BEC)
with dipolar atomic interactions in th... | cond-mat_quant-gas |
Two-dimensional dipolar Bose-Einstein condensate bright and vortex
solitons on one-dimensional optical lattice: By solving the three-dimensional Gross-Pitaevskii equation we generate
two-dimensional axially-symmetric and anisotropic dipolar Bose-Einstein
condensate bright solitons, for repulsive atomic interaction, s... | cond-mat_quant-gas |
Properties of the signal mode in the polariton OPO regime: Theoretical analyses of the polariton optical parametric oscillator (OPO)
regime often rely on a mean field approach based on the complex
Gross-Pitaevskii equations in a three-mode approximation, where only three
momentum states, the signal, pump and idler, are... | cond-mat_quant-gas |
Four fermions in a one-dimensional harmonic trap: Accuracy of a
variational-ansatz approach: Detailed analysis of the system of four interacting ultra-cold fermions
confined in a one-dimensional harmonic trap is performed. The analysis is done
in the framework of a simple variational ansatz for the many-body ground s... | cond-mat_quant-gas |
Quantum phases of a spin-1 ultracold Bose gas with three body
interactions: We study the effects of both a repulsive and an attractive three body
interaction potential on a spin-1 ultracold Bose gas using mean field approach
(MFA). For an antiferromagnetic (AF) inter- action, we have found the existence
of the odd-ev... | cond-mat_quant-gas |
Negative differential conductivity and quantum statistical effects in a
three-site Bose-Hubbard model: The use of an electron beam to remove ultracold atoms from selected sites in
an optical lattice has opened up new opportunities to study transport in
quantum systems [R. Labouvie {\it et al.\ }, Phys.\ Rev.\ Lett.\ ... | cond-mat_quant-gas |
Mesoscopics of half-quantum vortex pair deconfinement in a trapped
spin-one condensate: Motivated by a recent experiment in an antiferromagnetic spin-1 Bose-Einstein
condensate of ${}^{23} \textrm{Na}$ atoms, we study the energetical stability
of a singly quantum vortex injected into the center of a quasi-two-dimensi... | 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 |
Quantum Kinetic Theory of Collisionless Superfluid Internal Convection: Superfluids can transport heat via simultaneous opposite flows of their
spatially interpenetrating condensate and thermal components. While this
internal convection is usually described within Landau's phenomenological two
fluid hydrodynamics, we a... | cond-mat_quant-gas |
Hanbury-Brown and Twiss bunching of phonons and of the quantum depletion
in a strongly-interacting Bose gas: We report the realisation of a Hanbury-Brown and Twiss (HBT)-like experiment
with a gas of strongly interacting bosons at low temperatures. The regime of
large interactions and low temperatures is reached in a... | cond-mat_quant-gas |
Theory of the Rotating Polaron: Spectrum and Self-Localization: We study a quantum impurity possessing both translational and internal
rotational degrees of freedom interacting with a bosonic bath. Such a system
corresponds to a `rotating polaron', which can be used to model, e.g., a
rotating molecule immersed in an ul... | cond-mat_quant-gas |
Signatures of the single particle mobility edge in the ground state
properties of Tonks-Girardeau and non-interacting Fermi gases in a
bichromatic potential: We explore the ground state properties of cold atomic gases, loaded into a
bichromatic lattice, focusing on the cases of non-interacting fermions and
hard-cor... | cond-mat_quant-gas |
Imaging of quantum Hall states in ultracold atomic gases: We examine off-resonant light scattering from ultracold atoms in the quantum
Hall regime. When the light scattering is spin dependent, we show that images
formed in the far field can be used to distinguish states of the system. The
spatial dependence of the far-... | cond-mat_quant-gas |
Persistent currents with non-quantized angular momentum: We analyze the generation of persistent currents in Bose-Einstein condensates
of ultracold gases confined in a ring. This phenomenon has been recently
investigated in an experiment [Nature \textbf{506}, 200 (2014)], where
hysteresis loops have been observed in th... | cond-mat_quant-gas |
Mechanism of Tunneling in Interacting Open Ultracold Few-Boson Systems: We investigate the mechanism in the tunneling dynamics of open ultracold
few-boson systems by numerically solving the time-dependent few-boson
Schr\"{o}dinger equation exactly. By starting from a weakly repulsive,
initially coherent two-boson syste... | cond-mat_quant-gas |
Interaction-induced instability and chaos in the photoassociative
stimulated Raman adiabatic passage from atomic to molecular Bose-Einstein
condensates: We study the effect of interactions on the conversion of atomic -to molecular
Bose-Einstein condensates via stimulated Raman adiabatic passage. Both
energetic inst... | cond-mat_quant-gas |
Multi-Stability in Cavity QED with Spin-Orbit Coupled Bose-Einstein
Condensate: We investigate the occurrence of steady-state multi-stability in a cavity
system containing spin-orbit coupled Bose-Einstein condensate and driven by a
strong pump laser. The applied magnetic field splits the Bose-Einstein
condensate into... | cond-mat_quant-gas |
Superfluid properties of bright solitons in a ring: We theoretically investigate superfluid properties of a one-dimensional
annular superfluid with a boost. We derive the formula of the superfluid
fraction in the one-dimensional superfluid, which was originally derived by
Leggett in the context of supersolid. We see th... | cond-mat_quant-gas |
Phase-separated vortex-lattice in a rotating binary Bose-Einstein
condensate: We study circularly-symmetric phase separation of vortex lattices in a
rapidly rotating harmonically-trapped quasi--two-dimensional binary
Bose-Einstein condensate (BEC) by introducing a weak quartic trap in one of the
components. The incre... | cond-mat_quant-gas |
Spin squeezing in dipolar spinor condensates: We study the effect of dipolar interactions on the level of squeezing in
spin-1 Bose-Einstein condensates by using the single mode approximation. We
limit our consideration to the $\mathfrak{su}(2)$ Lie subalgebra spanned by
spin operators. The biaxial nature of dipolar int... | cond-mat_quant-gas |
Universal quantum dynamics of Bose polarons: Predicting the emergent properties of impurities immersed in a quantum bath
is a fundamental challenge that can defy quasiparticle treatments. Here, we
measure the spectral properties and real-time dynamics of mobile impurities
injected into a homogeneous Bose--Einstein cond... | cond-mat_quant-gas |
Quantum phase transitions in the dimerized extended Bose-Hubbard model: We present an unbiased numerical density-matrix renormalization group study
of the one-dimensional Bose-Hubbard model supplemented by nearest-neighbor
Coulomb interaction and bond dimerization. It places the emphasis on the
determination of the gro... | 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 |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.