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Optimizing Quantum Gas Production by an Evolutionary Algorithm: We report on the application of an evolutionary algorithm (EA) to enhance
performance of an ultra-cold quantum gas experiment. The production of a
$^{87}$Rubidium Bose-Einstein condensate (BEC) can be divided into fundamental
cooling steps, specifically ma... | cond-mat_quant-gas |
Signatures of non-trivial pairing in the quantum walk of two-component
bosons: Nearest neighbour bosons possessing only onsite interactions do not form
onsite bound pairs in their quantum walk due to fermionization. We obtain
signatures of non-trivial onsite pairing in the quantum walk of strongly
interacting two com... | cond-mat_quant-gas |
Gas-to-soliton transition of attractive bosons on a spherical surface: We investigate the ground state properties of $N$ bosons with attractive
zero-range interactions characterized by the scattering length $a>0$ and
confined to the surface of a sphere of radius $R$. We present the analytic
solution of the problem for ... | cond-mat_quant-gas |
Two-dimensional imbalanced Fermi gas in antiparallel magnetic fields: We study a two-dimensional Fermi gas with an attractive interaction subjected
to synthetic magnetic fields, which are assumed to be mutually antiparallel for
two different spin components with population imbalance. By employing the
mean-field approxi... | cond-mat_quant-gas |
Quantum many-body effects on Rydberg excitons in cuprous oxide: We investigate quantum many-body effects on Rydberg excitons in cuprous oxide
induced by the surrounding electron-hole plasma. Line shifts and widths are
calculated by full diagonalisation of the plasma Hamiltonian and compared to
results in first order pe... | cond-mat_quant-gas |
Condensate fraction and critical temperature of interacting Bose gas in
anharmonic trap: By using a correlated many body method and using the realistic van der Waals
potential we study several statistical measures like the specific heat,
transition temperature and the condensate fraction of the interacting Bose gas
t... | cond-mat_quant-gas |
Vortex stream generation and enhanced propagation in a polariton
superfluid: In this work, we implement a new experimental configuration which exploits
the specific properties of the optical bistability exhibited by the polariton
system and we demonstrate the generation of a superfluid turbulent flow in the
wake of a... | cond-mat_quant-gas |
Interaction effects on dynamic correlations in non-condensed Bose gases: We consider dynamic, i.e., frequency-dependent, correlations in non-condensed
ultracold atomic Bose gases. In particular, we consider the single-particle
correlation function and its power spectrum. We compute this power spectrum for
a one-compone... | cond-mat_quant-gas |
Ground state phase diagram of the repulsive SU(3) Hubbard model in
Gutzwiller approximation: We perform a variational Gutzwiller calculation to study the ground state of
the repulsive SU(3) Hubbard model on the Bethe lattice with infinite
coordination number. We construct a ground-state phase diagram focusing on
phas... | cond-mat_quant-gas |
Observation of Floquet band topology change in driven ultracold Fermi
gases: Periodic driving of a quantum system can significantly alter its energy bands
and even change the band topology, opening a completely new avenue for
engineering novel quantum matter. Although important progress has been made
recently in meas... | cond-mat_quant-gas |
Apparent low-energy scale invariance in two-dimensional Fermi gases: Recent experiments on a $\2d$ Fermi gas find an undamped breathing mode at
twice the trap frequency over a wide range of parameters. To understand this
seemingly scale-invariant behavior in a system with a scale, we derive two
exact results valid acro... | cond-mat_quant-gas |
Quantum quenches in the anisotropic spin-1/2 Heisenberg chain: different
approaches to many-body dynamics far from equilibrium: Recent experimental achievements in controlling ultracold gases in optical
lattices open a new perspective on quantum many-body physics. In these
experimental setups it is possible to study ... | cond-mat_quant-gas |
Bosonic Josephson effect in the Fano-Anderson model: We investigate the coherent dynamics of a non-interacting Bose-Einstein
condensate in a system consisting of two bosonic reservoirs coupled via a
spatially localized mode. We describe this system by a two-terminal
Fano-Anderson model and investigate analytically the ... | cond-mat_quant-gas |
Number squeezed and fragmented states of strongly interacting bosons in
a double well: We present a systematic study of the phenomena of number squeezing and
fragmentation for a repulsive Bose-Einstein condensate (BEC) in a three
dimensional double well potential over a range of interaction strengths and
barrier heig... | cond-mat_quant-gas |
Losses in interacting quantum gases: ultra-violet divergence and its
regularization: We investigate the effect of losses on an interacting quantum gas. We show
that, for gases in dimension higher than one, assuming together a vanishing
correlation time of the reservoir where dissipation occurs, and contact
interactio... | cond-mat_quant-gas |
Low-lying energy levels of a one-dimensional weakly interacting Bose gas
under zero boundary conditions: We diagonalize the second-quantized Hamiltonian of a one-dimensional Bose gas
with a nonpoint repulsive interatomic potential and zero boundary conditions.
At weak coupling the solutions for the ground-state energ... | cond-mat_quant-gas |
Spatiotemporal scaling of two-dimensional nonequilibrium
exciton-polariton systems with weak interactions: We perform a numerical study on the two-dimensional nonequilibrium
exciton-polariton systems driven by incoherent pumping based on the stochastic
generalized Gross-Pitaevskii equation. We calculate the density f... | cond-mat_quant-gas |
Formation of nonlinear X-waves in condensed matter systems: X-waves are an example of a localized wave packet solution of the homogeneous
wave equation, and can potentially arise in any area of physics relating to
wave phenomena, such as acoustics, electromagnetism, or quantum mechanics. They
have been predicted in con... | cond-mat_quant-gas |
Early Stage of Superradiance from Bose-Einstein Condensates: We investigate the dynamics of matter and optical waves at the early stage of
superradiant Rayleigh scattering from Bose-Einstein Condensates. Our analysis
is within a spatially dependent quantum model which is capable of providing
analytic solutions for the ... | cond-mat_quant-gas |
Numerical analysis of spin-orbit coupled one dimensional Fermi gas in
the magnetic field: We use the density matrix renormalization group method(DMRG) and the infinite
time evolved block decimation method(iTEBD) to investigate the ground states of
the spin-orbit coupled Fermi gas in a one dimensional optical lattice ... | cond-mat_quant-gas |
Spin dynamics and domain formation of a spinor Bose-Einstein condensate
in an optical cavity: We consider a ferromagnetic spin-1 Bose-Einstein condensate (BEC)
dispersively coupled to a unidirectional ring cavity. We show that the ability
of a cavity to modify, in a highly nonlinear fashion, matter-wave phase shifts
... | cond-mat_quant-gas |
Dynamical response of ultracold interacting fermion-boson mixtures: We analyze the dynamical response of a ultracold binary gas mixture in
presence of strong boson-fermion couplings. Mapping the problem onto that of
the optical response of a metal/semiconductor electronic degrees of freedom to
electromagnetic perturbat... | cond-mat_quant-gas |
Spontaneous symmetry breaking in rotating condensates of ultracold atoms: We describe an equilibrium state of a rotating trapped atomic condensate,
which is characterized by a non-zero internal circulation and spontaneous
breaking of the rotational O(2) symmetry with all three major semiaxes of the
condensate having di... | cond-mat_quant-gas |
Expansion of the strongly interacting superfluid Fermi gas: symmetries
and self-similar regimes: We consider an expansion of the strongly interacting superfluid Fermi gas in
a vacuum, assuming absence of the trapping potential, in the so-called unitary
regime (see, for instance, \cite{pitaevskii2008superfluid}) when ... | cond-mat_quant-gas |
Superglass formation in an atomic BEC with competing long-range
interactions: The complex dynamical phases of quantum systems are dictated by atomic
interactions that usually evoke an emergent periodic order. Here, we study a
quantum many-body system with two competing and substantially different
long-range interacti... | cond-mat_quant-gas |
Universality in rotating strongly interacting gases: We analytically determine the properties of two interacting particles in a
harmonic trap subject to a rotation or a uniform synthetic magnetic field,
where the spherical symmetry of the relative Hamiltonian is preserved.
Thermodynamic quantities such as the entropy a... | cond-mat_quant-gas |
Transport, atom blockade and output coupling in a Tonks-Girardeau gas: Recent experiments have demonstrated how quantum-mechanical impurities can be
created within strongly correlated quantum gases and used to probe the
coherence properties of these systems [S. Palzer, C. Zipkes, C. Sias, and M.
K\"ohl, Phys. Rev. Lett... | cond-mat_quant-gas |
Magnetic lattices for ultracold atoms and degenerate quantum gases: We review recent developments in the use of magnetic lattices as a
complementary tool to optical lattices for trapping periodic arrays of
ultracold atoms and degenerate quantum gases. Recent advances include the
realisation of Bose-Einstein condensatio... | cond-mat_quant-gas |
Deformation of a quantum many-particle system by a rotating impurity: During the last 70 years, the quantum theory of angular momentum has been
successfully applied to describing the properties of nuclei, atoms, and
molecules, their interactions with each other as well as with external fields.
Due to the properties of ... | cond-mat_quant-gas |
Multidimensional hybrid Bose-Einstein condensates stabilized by
lower-dimensional spin-orbit coupling: We show that attractive spinor Bose-Einstein condensates under the action of
spin-orbit coupling (SOC) and Zeeman splitting form self-sustained stable two-
and three-dimensional (2D and 3D) states in free space, eve... | cond-mat_quant-gas |
Few-boson tunneling in a double well with spatially modulated
interaction: We study few-boson tunneling in a one-dimensional double well with a
spatially modulated interaction. The dynamics changes from Rabi oscillations in
the non-interacting case to a highly suppressed tunneling for intermediate
coupling strengths ... | cond-mat_quant-gas |
Patterned Supersolids in Dipolar Bose Systems: We study by means of first principle Quantum Monte Carlo simulations the
ground state phase diagram of a system of dipolar bosons with aligned dipole
moments, and with the inclusion of a two-body repulsive potential of varying
range. The system is shown to display a supers... | cond-mat_quant-gas |
A pathway to ultracold bosonic $^{23}\textrm{Na}^{39}\textrm{K}$ ground
state molecules: We spectroscopically investigate a pathway for the conversion of
$^{23}\textrm{Na}^{39}\textrm{K}$ Feshbach molecules into rovibronic ground
state molecules via STImulated Raman Adiabatic Passage (STIRAP). Using
photoassociation ... | cond-mat_quant-gas |
Superfluidity breakdown of periodic matter waves in quasi
one-dimensional annular traps via resonant scattering with moving defects: We investigate, both analytically and numerically, the quasi-superfluidity
properties of periodic Bose-Einstein condensates (BECs) in a
quasi-one-dimensional (1D) ring with optical latt... | cond-mat_quant-gas |
Sub-micron period lattice structures of magnetic microtraps for
ultracold atoms on an atom chip: We report on the design, fabrication and characterization of magnetic
nanostructures to create a lattice of magnetic traps with sub--micron period
for trapping ultracold atoms. These magnetic nanostructures were fabricate... | cond-mat_quant-gas |
Critical velocity in resonantly driven polariton superfluids: We study the necessary condition under which a resonantly driven exciton
polariton superfluid flowing against an obstacle can generate turbulence. The
value of the critical velocity is well estimated by the transition from
elliptic to hyperbolic of an operat... | cond-mat_quant-gas |
Efficiently Extracting Multi-Point Correlations of a Floquet Thermalized
System: Nonequilibrium dynamics of many-body systems is challenging for classical
computing, providing opportunities for demonstrating practical quantum
computational advantage with analogue quantum simulators. It is proposed to be
classically i... | cond-mat_quant-gas |
Snake instability of dark solitons across the BEC-BCS crossover: an
effective field theory perspective: In the present article the snake instability mechanism for dark solitons in
superfluid Fermi gases is studied in the context of a recently developed
effective field theory [Eur. Phys. J. B 88, 122 (2015)]. This the... | cond-mat_quant-gas |
Inhomogeneities and impurities in a dense one-dimensional Rydberg
lattice gas: We consider a dense one-dimensional laser-driven Rydberg lattice gas with
perfect nearest-neighbor blockade. The ground state of this system can be found
analytically in certain parameter regimes even when the applied fields are
inhomogene... | cond-mat_quant-gas |
Topologically protected edge gap solitons of interacting Bosons in
one-dimensional superlattices: We comprehensively investigate the nontrivial states of interacting Bose
system in one-dimensional optical superlattices under the open boundary
condition. Our results show that there exists a kind of stable localized
st... | cond-mat_quant-gas |
Fulde-Ferrell Superfluids without Spin Imbalance in Driven Optical
Lattices: Spin-imbalanced ultracold Fermi gases have been widely studied recently as a
platform for exploring the long-sought Fulde-Ferrell-Larkin-Ovchinnikov
superfluid phases, but so far conclusive evidence has not been found. Here we
propose to rea... | cond-mat_quant-gas |
Composite structure of vortices in two-component Bose-Einstein
condensate: In contrast to one-component Bose-Einstein condensate case, the vortices in
two-component condensate can have various complicated structures. The vortices
in a space-homogeneous Bose-Einstein condensate have been studied in this
paper. It is s... | cond-mat_quant-gas |
Spatial pattern formation and polarization dynamics of a nonequilibrium
spinor polariton condensate: Quasiparticles in semiconductors -- such as microcavity polaritons -- can
form condensates in which the steady-state density profile is set by the
balance of pumping and decay. By taking account of the polarization de... | cond-mat_quant-gas |
Controlling spontaneous-emission noise in measurement-based feedback
cooling of a Bose-Einstein Condensate: Off-resonant optical imaging is the most popular method for continuous
monitoring of a Bose-Einstein condensate (BEC). However, the disturbance caused
by scattered photons places a serious limitation on the lif... | cond-mat_quant-gas |
Association of Efimov trimers from a three-atom continuum: We develop an experimental technique for rf-association of Efimov trimers
from three-atoms continuum. We apply it to probe the lowest accessible Efimov
energy level in bosonic lithium in the region where strong deviations from the
universal behavior are expecte... | cond-mat_quant-gas |
Universal many-body response of heavy impurities coupled to a Fermi sea: In this work we discuss the dynamical response of heavy quantum impurities
immersed in a Fermi gas at zero and at finite temperature. Studying both the
frequency and the time domain allows one to identify interaction regimes that
are characterized... | cond-mat_quant-gas |
Self-induced entanglement resonance in a disordered Bose-Fermi mixture: Different regimes of entanglement growth under measurement have been
demonstrated for quantum many-body systems, with an entangling phase for low
measurement rates and a disentangling phase for high rates (quantum Zeno
effect). Here we study entang... | cond-mat_quant-gas |
Dissipative topological superconductors in number-conserving systems: We discuss the dissipative preparation of p-wave superconductors in
number-conserving one-dimensional fermionic systems. We focus on two setups:
the first one entails a single wire coupled to a bath, whereas in the second
one the environment is conne... | cond-mat_quant-gas |
Optical-plug-assisted spin vortex in a $^{87}$Rb dipolar spinor
Bose-Einstein condensate: Generating a spin vortex in a $^{87}$Rb dipolar spinor Bose-Einstein
condensate in a controllable way is still experimentally challenging. We
propose an experimentally easy and tunable way to produce spin vortex by
varying the p... | cond-mat_quant-gas |
Connecting Topological Anderson and Mott Insulators in Disordered
Interacting Fermionic Systems: The topological Anderson and Mott insulators are two phases that have so far
been separately and widely explored beyond topological band insulators. Here we
combine the two seemingly different topological phases into a sy... | cond-mat_quant-gas |
Position- and momentum-space two-body correlations in a weakly
interacting trapped condensate: We investigate the position- and momentum-space two--body correlations in a
weakly interacting, harmonically trapped atomic Bose-Einstein condensed gas at
low temperatures. The two-body correlations are computed within the ... | cond-mat_quant-gas |
Phase Winding a Two-Component BEC in an Elongated Trap: Experimental
Observation of Moving Magnetic Orders and Dark-bright Solitons: We experimentally investigate the phase winding dynamics of a harmonically
trapped two-component BEC subject to microwave induced Rabi oscillations
between two pseudospin components. Wh... | cond-mat_quant-gas |
Experimental Methods for Generating Two-Dimensional Quantum Turbulence
in Bose-Einstein Condensates: Bose-Einstein condensates of dilute gases are well-suited for investigations
of vortex dynamics and turbulence in quantum fluids, yet there has been little
experimental research into the approaches that may be most pr... | cond-mat_quant-gas |
Mesoscopic quantum superpositions in bimodal Bose-Einstein condensates:
decoherence and strategies to counteract it: We study theoretically the interaction-induced generation of mesoscopic
coherent spin state superpositions (small cat states) from an initial coherent
spin state in bimodal Bose-Einstein condensates an... | cond-mat_quant-gas |
Universal contact and collective excitations of a strongly interacting
Fermi gas: We study the relationship between Tan's contact parameter and the macroscopic
dynamic properties of an ultracold trapped gas, such as the frequencies of the
collective oscillations and the propagation of sound in one-dimensional (1D)
co... | cond-mat_quant-gas |
Detecting quadrupole interactions in ultracold Fermi gases: We propose to detect quadrupole interactions of neutral ultra-cold atoms via
their induced mean-field shift. We consider a Mott insulator state of
spin-polarized atoms in a two-dimensional optical square lattice. The
quadrupole moments of the atoms are aligned... | cond-mat_quant-gas |
Superfluidity of a Raman spin-orbit-coupled Bose gas at finite
temperature: We investigate the superfluidity of a three-dimensional weakly interacting
Bose gas with a one-dimensional Raman-type spin-orbit coupling at both zero and
finite temperatures. Using the imaginary-time Green's function within the
Bogoliubov ap... | cond-mat_quant-gas |
Sudden and slow quenches into the antiferromagnetic phase of ultracold
fermions: We propose a method to reach the antiferromagnetic state of two-dimensional
Fermi gases trapped in optical lattices: Independent subsystems are prepared in
suitable initial states and then connected by a sudden or slow quench of the
tunn... | cond-mat_quant-gas |
Itinerant ferromagnetism of two-dimensional repulsive fermions with Rabi
coupling: We study a two-dimensional fermionic cloud of repulsive alkali-metal atoms
characterized by two hyperfine states which are Rabi coupled. Within a
variational Hartree-Fock scheme, we calculate analytically the ground-state
energy of the... | cond-mat_quant-gas |
Three-body repulsive forces among identical bosons in one dimension: I consider non-relativistic bosons interacting via pairwise potentials with
infinite scattering length and supporting no two-body bound states. To lowest
order in effective field theory, these conditions lead to non-interacting
bosons, since the coupl... | cond-mat_quant-gas |
Measuring entropy and mutual information in the two-dimensional Hubbard
model: We measure pressure and entropy of ultracold fermionic atoms in an optical
lattice for a range of interaction strengths, temperatures and fillings. Our
measurements demonstrate that, for low enough temperatures, entropy-rich
regions form l... | cond-mat_quant-gas |
Synthetic Dimensions for Cold Atoms from Shaking a Harmonic Trap: We introduce a simple scheme to implement synthetic dimensions in ultracold
atomic gases, which only requires two basic and ubiquitous ingredients: the
harmonic trap, which confines the atoms, combined with a periodic shaking. In
our approach, standard h... | cond-mat_quant-gas |
Compressibility and entropy of cold fermions in one dimensional optical
lattices: We calculate several thermodynamic quantities for repulsively interacting
one-dimensional fermions.We solve the Hubbard model at both zero and finite
temperatures using the Bethe-ansatz method. For arbitrary values of the
chemical poten... | cond-mat_quant-gas |
Interacting bosonic flux ladders with a synthetic dimension:
Ground-state phases and quantum quench dynamics: Flux ladders constitute the minimal setup enabling a systematic understanding
of the rich physics of interacting particles subjected simultaneously to strong
magnetic fields and a lattice potential. In this p... | cond-mat_quant-gas |
Reliable equation of state for composite bosons in the 2D BCS-BEC
crossover: We briefly discuss recent experiments on the BCS-BEC crossover with ultracold
alkali-metal atoms both in three-dimensional configurations and two-dimensional
ones. Then we analyze the quantum-field-theory formalism used to describe an
attrac... | cond-mat_quant-gas |
Loss-induced phase separation and pairing for 3-species atomic lattice
fermions: We study the physics of a three-component Fermi gas in an optical lattice, in
the presence of a strong three-body constraint arising due to three-body loss.
Using analytical and numerical techniques, we show that an atomic color
superflu... | cond-mat_quant-gas |
A mobile ion in a Fermi sea: The remarkable single particle control of individual ions combined with the
versatility of ultracold atomic gases makes hybrid ion-atom system an exciting
new platform for quantum simulation of few- and many-body quantum physics.
Here, we study theoretically the properties of a mobile ion i... | cond-mat_quant-gas |
Quantum Chaos in Ultracold Collisions of Erbium: Atomic and molecular samples reduced to temperatures below 1 microkelvin, yet
still in the gas phase, afford unprecedented energy resolution in probing and
manipulating how their constituent particles interact with one another. For
simple atoms, such as alkalis, scatteri... | cond-mat_quant-gas |
Different models of gravitating Dirac fermions in optical lattices: In this paper I construct the naive lattice Dirac Hamiltonian describing the
propagation of fermions in a generic 2D optical metric for different lattice
and flux-lattice geometries. First, I apply a top-down constructive approach
that we first propose... | cond-mat_quant-gas |
Realizing Hopf Insulators in Dipolar Spin Systems: The Hopf insulator is a weak topological insulator characterized by an
insulating bulk with conducting edge states protected by an integer-valued
linking number invariant. The state exists in three-dimensional two-band
models. We demonstrate that the Hopf insulator can... | cond-mat_quant-gas |
State selective cooling of $\mathrm{SU}(N)$ Fermi-gases: We investigate a species selective cooling process of a trapped
$\mathrm{SU}(N)$ Fermi gas using entropy redistribution during adiabatic
loading of an optical lattice. Using high-temperature expansion of the Hubbard
model, we show that when a subset $N_A < N$ of ... | cond-mat_quant-gas |
Anomalous supersolidity in a weakly interacting dipolar Bose mixture on
a square lattice: We calculate the mean-field phase diagram of a zero-temperature, binary Bose
mixture on a square optical lattice, where one species possesses a
non-negligible dipole moment. Remarkably, this system exhibits supersolidity
for ano... | cond-mat_quant-gas |
Supersolid phases of lattice dipoles tilted in three-dimensions: By means of quantum Monte Carlo simulations we study phase diagrams of
dipolar bosons in a square optical lattice. The dipoles in the system are
parallel to each other and their orientation can be fixed in any direction of
the three-dimensional space. Sta... | cond-mat_quant-gas |
Realizing quantum Ising models in tunable two-dimensional arrays of
single Rydberg atoms: Spin models are the prime example of simplified manybody Hamiltonians used to
model complex, real-world strongly correlated materials. However, despite their
simplified character, their dynamics often cannot be simulated exactly... | cond-mat_quant-gas |
Fate of the Mollow triplet in strongly-coupled atomic arrays: Subwavelength arrays of quantum emitters have emerged as an interesting
platform displaying prominent collective effects. Here we study such arrays
under coherent driving, realizing an open quantum many-body problem in a
strongly non-linear regime. We show t... | cond-mat_quant-gas |
Spatially Modulated Interaction Induced Bound States and Scattering
Resonances: We study the two-body problem with a spatially modulated interaction
potential using a two-channel model, in which the inter-channel coupling is
provided by an optical standing wave and its strength modulates periodically in
space. As the... | cond-mat_quant-gas |
Quantum-geometric perspective on spin-orbit-coupled Bose superfluids: We employ the Bogoliubov approximation to study how the quantum geometry of
the helicity states affects the superfluid properties of a spin-orbit-coupled
Bose gas in continuum. In particular we derive the low-energy Bogoliubov
spectrum for a plane-wa... | cond-mat_quant-gas |
Properties of the Superfluid in the Disordered Bose-Hubbard Model: We investigate the properties of the superfluid phase in the
three-dimensional disordered Bose-Hubbard model using Quantum Monte-Carlo
simulations. The phase diagram is generated using Gaussian disorder on the
on-site potential. Comparisons with box and... | cond-mat_quant-gas |
Diffusion Monte Carlo methods for Spin-Orbit-Coupled ultracold Bose
gases: We present two Diffusion Monte Carlo (DMC) algorithms for systems of
ultracold quantum gases featuring synthetic spin-orbit interactions. The first
one is a discrete spin generalization of the T- moves spin-orbit DMC, which
provides an upper b... | cond-mat_quant-gas |
Many-body approach to low-lying collective excitations in a BEC
approaching collapse: An approximate many-body theory incorporating two-body correlations has been
employed to calculate low-lying collective multipole frequencies in a
Bose-Einstein condensate containing $A$ bosons, for different values of the
interacti... | cond-mat_quant-gas |
Multicriticality, Metastability, and Roton Feature in Bose-Einstein
Condensates with Three-Dimensional Spin-Orbit Coupling: We theoretically study homogeneously trapped atomic Bose-Einstein condensates
where all three momentum components couple to a pseudo-spin-$1/2$ degree of
freedom. Tuning the anisotropies of spin... | cond-mat_quant-gas |
Instability of superfluid Fermi gases induced by a roton-like density
mode in optical lattices: We study the stability of superfluid Fermi gases in deep optical lattices in
the BCS--Bose-Einstein condensation (BEC) crossover at zero temperature. Within
the tight-binding attractive Hubbard model, we calculate the spec... | cond-mat_quant-gas |
Local correlations in the attractive 1D Bose gas: from Bethe ansatz to
the Gross-Pitaevskii equation: We consider the ground-state properties of an extended one-dimensional Bose
gas with pointwise attractive interactions. We take the limit where the
interaction strength goes to zero as the system size increases at fi... | cond-mat_quant-gas |
Degenerate approach to the mean field Bose- Hubbard Hamiltonian: A degenerate variant of mean field perturbation theory for the on-site
Bose-Hubbard Hamiltonian is presented. We split the perturbation into two terms
and perform exact diagonalization in the two-dimensional subspace corresponding
to the degenerate states... | cond-mat_quant-gas |
A long-lived Higgs mode in a two-dimensional confined Fermi gas: The Higgs mode corresponds to the collective motion of particles due to the
vibrations of an invisible field. It plays a fundamental role for our
understanding of both low and high energy physics, giving elementary particles
their mass and leading to coll... | cond-mat_quant-gas |
Modulational instability and soliton generation in chiral Bose-Einstein
condensates with zero-energy nonlinearity: By means of analytical and numerical methods, we address the modulational
instability (MI) in chiral condensates governed by the Gross-Pitaevskiiequation
including the current nonlinearity. The analysis ... | cond-mat_quant-gas |
Thermodynamics of a Bose gas near the superfluid--Mott-insulator
transition: We study the thermodynamics near the generic (density-driven)
superfluid--Mott-insulator transition in the three-dimensional Bose-Hubbard
model using the nonperturbative renormalization-group approach. At low energy
the physics is controlled... | cond-mat_quant-gas |
Criticality-enhanced quantum sensing in ferromagnetic Bose-Einstein
condensates: role of readout measurement and detection noise: We theoretically investigate estimation of the control parameter in a
ferromagnetic Bose-Einstein condensate near second order quantum phase
transitions. We quantify sensitivity by quantum... | cond-mat_quant-gas |
Intermediate super-exponential localization with Aubry-André chains: We demonstrate the existence of an intermediate super-exponential
localization regime for eigenstates of the Aubry-Andr\'e chain. In this regime,
the eigenstates localize factorially similarly to the eigenstates of the
Wannier-Stark ladder. The super-... | cond-mat_quant-gas |
Theoretical Prediction of Non-Hermitian Skin Effect in Ultracold Atom
Systems: Non-Hermitian skin effect, which refers to the phenomenon that an extensive
number of eigenstates are localized at the boundary, has been widely studied in
lattice models and experimentally observed in several classical systems. In
this wo... | cond-mat_quant-gas |
Signatures of non-trivial pairing in the quantum walk of two-component
bosons: Nearest neighbour bosons possessing only onsite interactions do not form
onsite bound pairs in their quantum walk due to fermionization. We obtain
signatures of non-trivial onsite pairing in the quantum walk of strongly
interacting two com... | cond-mat_quant-gas |
Virial coefficients for Bose and Fermi trapped gases beyond the unitary
limit: an S-Matrix approach: We study the virial expansion for three-dimensional Bose and Fermi gases at
finite temperature using an approximation that only considers two-body
processes and is valid for high temperatures and low densities. The fi... | cond-mat_quant-gas |
The Higgs mode in a superfluid of Dirac fermions: We study the Higgs amplitude mode in the s-wave superfluid state on the
honeycomb lattice inspired by recent cold atom experiments. We consider the
attractive Hubbard model and focus on the vicinity of a quantum phase
transition between semi-metal and superfluid phases.... | cond-mat_quant-gas |
Revealing Hidden Antiferromagnetic Correlations in Doped Hubbard Chains
via String Correlators: Topological phases, like the celebrated Haldane phase in spin-1 chains, defy
characterization through local order parameters. Instead, non-local string
order parameters can be employed to reveal their hidden order. Similar... | cond-mat_quant-gas |
Thermodynamic signatures for topological phase transitions to Majorana
and Weyl superfluids in ultracold Fermi gases: We discuss the thermodynamic signatures for the topological phase transitions
into Majorana and Weyl superfluid phases in ultracold Fermi gases in two and
three dimensions in the presence of Rashba sp... | cond-mat_quant-gas |
Majorana edge-modes in a spinful particle conserving model: We show the presence of Majorana edge modes in an interacting fermionic
ladder with spin in a number conserved setting. The interchain single particle
hopping is suppressed and only a pair hopping is present between the different
chains of the ladder. Addition... | 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 |
Interactions and dynamics of one-dimensional droplets, bubbles and kinks: We explore the dynamics and interactions of multiple bright droplets and
bubbles, as well as the interactions of kinks with droplets and with antikinks,
in the extended one-dimensional Gross-Pitaevskii model including the
Lee-Huang-Yang correctio... | cond-mat_quant-gas |
Above-Barrier Reflection of Cold Atoms by Resonant Laser Light within
the Gross-Pitaevskii Approximation: Above-barrier reflection of cold alkali atoms by resonant laser light was
considered analytically within the Gross-Pitaevskii approximation. Correction
for the reflection coefficient because of a weak nonlinearit... | cond-mat_quant-gas |
A proof to Biswas-Mitra-Bhattacharyya conjecture for ideal quantum gas
trapped under generic power law potential $U=\sum_{i=1} ^d c_i |\frac
{x_i}{a_i}|^{n_i}$ in $d$ dimension: The well known relation for ideal classical gas $\Delta \epsilon^2=kT^2 C_V$
which does not remain valid for quantum system is revisited. ... | cond-mat_quant-gas |
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