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Quantum anomaly and 2D-3D crossover in strongly interacting Fermi gases: We present an experimental investigation of collective oscillations in
harmonically trapped Fermi gases through the crossover from two to three
dimensions. Specifically, we measure the frequency of the radial monopole or
breathing mode as a functi... | cond-mat_quant-gas |
Notes on the Cluster Gutzwiller Method: Inhomogeneous Lattices,
Excitations, and Cluster Time Evolution: Several perspectives of the cluster Gutzwiller method are briefly discussed.
I show that the cluster mean-field method can be used for large inhomogeneous
lattices, for computing local excitations, and for the tim... | 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 |
Chiral condensates in a polariton hexagonal ring: We model generation of vortex modes in exciton-polariton condensates in
semiconductor micropillars, arranged into a hexagonal ring molecule, in the
presence of TE-TM splitting. This splitting lifts the degeneracy of azimuthally
modulated vortex modes with opposite topol... | cond-mat_quant-gas |
Hidden vortices in a Bose-Einstein condensate in a rotating double-well
potential: We study vortex formation in a Bose-Einstein condensate in a rotating
double-well potential. Besides the ordinary quantized vortices and elusive
ghost vortices, "hidden" vortices are found distributing along the central
barrier. These ... | cond-mat_quant-gas |
Two types of dark solitons in a spin-orbit-coupled Fermi gas: Dark solitons in quantum fluids are well known nonlinear excitations that are
usually characterized by a single length scale associated with the underlying
background fluid. We show that in the presence of spin-orbit coupling and a
linear Zeeman field, super... | cond-mat_quant-gas |
Effects of thermal and quantum fluctuations on the phase diagram of a
spin-1 87Rb Bose-Einstein condensate: We investigate effects of thermal and quantum fluctuations on the phase
diagram of a spin-1 87Rb Bose-Einstein condensate (BEC) under a quadratic
Zeeman effect. Due to the large ratio of spinindependent to spin... | cond-mat_quant-gas |
Effective dipole-dipole interactions in multilayered dipolar
Bose-Einstein condensates: We propose a two-dimensional model for a multilayer stack of dipolar
Bose-Einstein condensates formed by a strong optical lattice. We derive
effective intra- and interlayer dipole-dipole interaction potentials and
provide simple a... | cond-mat_quant-gas |
Particle and spin transports of spin-orbit coupled Fermi gas through a
Quantum Point Contact: The particle and spin transport through a quantum point contact between two
Fermi gases with Raman-induced spin-orbit coupling are investigated. We show
that the particle and spin conductances both demonstrate the structure ... | cond-mat_quant-gas |
Two-mode Dicke model from non-degenerate polarization modes: We realize a non-degenerate two-mode Dicke model with competing interactions
in a Bose-Einstein condensate (BEC) coupled to two orthogonal polarization
modes of a single optical cavity. The BEC is coupled to the cavity modes via
the scalar and vectorial part ... | cond-mat_quant-gas |
Gauge Violation Spectroscopy in Synthetic Gauge Theories: Recently synthetic gauge fields have been implemented on quantum simulators.
Unlike the gauge fields in the real world, in synthetic gauge fields, the gauge
charge can fluctuate and gauge invariance can be violated, which leading rich
physics unexplored before. ... | cond-mat_quant-gas |
From Nodal Ring Topological Superfluids to Spiral Majorana Modes in Cold
Atomic Systems: In this work, we consider a 3D cubic optical lattice composed of coupled 1D
wires with 1D spin-orbit coupling. When the s-wave pairing is induced through
Feshbach resonance, the system becomes a topological superfluid with ring
n... | cond-mat_quant-gas |
Interacting quantum walk on a two-leg flux ladder: Emergence of
re-entrant dynamics: We study the quench dynamics of interacting bosons on a two-leg flux ladder
by implementing the continuous-time quantum walk and explore the combined
effect of the magnetic field and onsite interaction in the presence of uniform
flux... | cond-mat_quant-gas |
Induced interaction and crystallization of self-localized impurity
fields in a Bose-Einstein condensate: We model the behavior of N classical impurity fields immersed in a larger
Bose-Einstein condensate by N+1 coupled nonlinear Schrodinger equations in 1,
2, and 3 space dimensions. We discuss the stability of the un... | cond-mat_quant-gas |
Bose-Einstein condensation of light in a cavity: The paper considers Bose-Einstein condensation (BEC) of light in a cavity
with medium. In the framework of two-level model we show the effect of gaseous
medium on the critical temperature of light condensation in the system.
Transition of the system to the state with rel... | 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 |
Critical velocity of a mobile impurity in one-dimensional quantum
liquids: We study the notion of superfluid critical velocity in one spatial dimension.
It is shown that for heavy impurities with mass $M$ exceeding a critical mass
$M_\mathrm{c}$, the dispersion develops periodic metastable branches resulting
in drama... | cond-mat_quant-gas |
Polaronic atom-trimer continuity in three-component Fermi gases: Recently it has been proposed that three-component Fermi gases may exhibit a
new type of crossover physics in which an unpaired Fermi sea of atoms smoothly
evolves into that of trimers in addition to the ordinary BCS-BEC crossover of
condensed pairs. Here... | cond-mat_quant-gas |
Spin-Orbit Coupling and Spin Textures in Optical Superlattices: We proposed and demonstrated a new approach for realizing spin orbit coupling
with ultracold atoms. We use orbital levels in a double well potential as
pseudospin states. Two-photon Raman transitions between left and right wells
induce spin-orbit coupling.... | cond-mat_quant-gas |
Dynamics of a quantum phase transition in the Bose-Hubbard model:
Kibble-Zurek mechanism and beyond: In this paper, we study the dynamics of the Bose-Hubbard model by using
time-dependent Gutzwiller methods. In particular, we vary the parameters in the
Hamiltonian as a function of time, and investigate the temporal b... | cond-mat_quant-gas |
Stability of supercurrents in a superfluid phase of spin-1 bosons in an
optical lattice: We study collective modes and superfluidity of spin-1 bosons with
antiferromagnetic interactions in an optical lattice based on the
time-dependent Ginzburg-Landau (TDGL) equation derived from the spin-1
Bose-Hubbard model. Specif... | cond-mat_quant-gas |
Fermionic Superradiance in a Transversely Pumped Optical Cavity: Following the experimental realization of Dicke superradiance in Bose gases
coupled to cavity light fields, we investigate the behavior of ultra cold
fermions in a transversely pumped cavity. We focus on the equilibrium phase
diagram of spinless fermions ... | cond-mat_quant-gas |
Self-consistent theory of Bose-Einstein condensate with impurity at
finite temperature: We study the properties of Bose-Einstein condensate (BEC)-impurity mixtures
at finite temperature employing the Balian-V\'en\'eroni (BV) variational
principle. The method leads to a set of coupled nonlinear equations of motion
for... | cond-mat_quant-gas |
$N$-coherence vs. $t$-coherence: An alternative route to the
Gross-Pitaevskii equation: We show how a candidate mean-field amplitude can be constructed from the
exact wave function of an externally forced $N$-Boson system. The construction
makes use of subsidiary $(N-1)$-particle states which are propagated in time i... | cond-mat_quant-gas |
Relaxation and hysteresis near Shapiro resonances in a driven spinor
condensate: We study the coherent and dissipative aspects of a driven spin-1
Bose-Einstein condensate (BEC) when the Zeeman energy is modulated around a
static bias value. Resonances appear when the bias energy matches an integer
number of modulatio... | cond-mat_quant-gas |
Density correlations from analogue Hawking radiation in the presence of
atom losses: The sonic analogue of Hawking radiation can now be experimentally recreated
in Bose-Einstein Condensates that contain an acoustic black hole. In these
experiments the signal strength and analogue Hawking temperature increase for
dens... | cond-mat_quant-gas |
Thermalization and localization of an oscillating Bose-Einstein
condensate in a disordered trap: We numerically simulate an oscillating Bose-Einstein condensate in a
disordered trap [Phys. Rev. A 82, 033603 (2010)] and the results are in good
agreement with the experiment. It allows us to verify that total energy and... | cond-mat_quant-gas |
Momentum distribution of a dilute unitary Bose gas with three-body
losses: Using Boltzmann's equation, we study the effect of three-body losses on the
momentum distribution of a homogeneous unitary Bose gas in the dilute limit
where quantum correlations are negligible. We calculate the momentum
distribution of the ga... | cond-mat_quant-gas |
Phases of driven two-level systems with nonlocal dissipation: We study an array of two-level systems arranged on a lattice and illuminated
by an external plane wave which drives a dipolar transition between the two
energy levels. In this set up, the two-level systems are coupled by dipolar
interactions and subject to n... | cond-mat_quant-gas |
Physical Realization of von Neumann Lattices in Rotating
Dipole-blockaded Bose Gases: A mathematical lattice, called the von Neumann lattice, is a subset of
coherent states and exists periodically in the phase space. It is unlike solids
or Abrikosov lattices that are observable in physical systems. Abrikosov
lattices... | cond-mat_quant-gas |
Realization of a distributed Bragg reflector for propagating guided
matter waves: We report on the experimental realization of a Bragg reflector for guided
matter waves. A Bose-Einstein condensate with controlled velocity distribution
impinges onto an attractive optical lattice of finite length and directly
probes it... | cond-mat_quant-gas |
On quantum time crystals and interacting gauge theories in atomic
Bose-Einstein condensates: We study the dynamics of a Bose-Einstein condensate trapped circumferentially
on a ring, and which is governed by an interacting gauge theory. We show that
the associated density-dependent gauge potential and concomitant curr... | cond-mat_quant-gas |
Quantum Many-Body Scars in Optical Lattices: The concept of quantum many-body scars has recently been put forward as a
route to describe weak ergodicity breaking and violation of the Eigenstate
Thermalization Hypothesis. We propose a simple setup to generate quantum
many-body scars in a doubly modulated Bose-Hubbard sy... | cond-mat_quant-gas |
Fractional angular momentum in cold atom systems: The quantum statistics of bosons or fermions are manifest through even or odd
relative angular momentum of a pair. We show theoretically that, under certain
conditions, a pair of certain test particles immersed in a fractional quantum
Hall state possesses, effectively, ... | cond-mat_quant-gas |
Propagating wave-packets and quantised currents in coherently driven
polariton superfluids: We study the properties of propagating polariton wave-packets and their
connection to the stability of doubly charged vortices. Wave-packet propagation
and related photoluminescence spectra exhibit a rich behaviour dependent o... | cond-mat_quant-gas |
Thermodynamic signatures of the polaron-molecule transition in a Fermi
gas: We consider the highly spin-imbalanced limit of a two-component Fermi gas,
where there is a small density of $\downarrow$ impurities attractively
interacting with a sea of $\uparrow$ fermions. In the single-impurity limit at
zero temperature,... | cond-mat_quant-gas |
Direct observation of coherent inter-orbital spin-exchange dynamics: We report on the first direct observation of fast spin-exchange coherent
oscillations between different long-lived electronic orbitals of ultracold
$^{173}$Yb fermions. We measure, in a model-independent way, the strength of
the exchange interaction d... | cond-mat_quant-gas |
Modulational Instabity of Spin-Orbit Coupled Bose-Einstein Condensates
in Discrete Media: We address the impact of intra-site spin-orbit (SO) coupling and associated
inter-component Rabi coupling on the modulational instability (MI) of
plane-wave states in two-component discrete Bose-Einstein condensates (BECs).
Cond... | cond-mat_quant-gas |
In Situ Momentum Distribution Measurement of a Quantum Degenerate Fermi
Gas using Raman Spectroscopy: The ability to directly measure the momentum distribution of quantum gases is
both unique to these systems and pivotal in extracting many other important
observables. Here we use Raman transitions to measure the mome... | cond-mat_quant-gas |
The Peierls substitution in an engineered lattice potential: Artificial gauge fields open new possibilities to realize quantum many-body
systems with ultracold atoms, by engineering Hamiltonians usually associated
with electronic systems. In the presence of a periodic potential, artificial
gauge fields may bring ultrac... | cond-mat_quant-gas |
Anomalous Behavior of Spin Systems with Dipolar Interactions: We study the properties of spin systems realized by cold polar molecules
interacting via dipole-dipole interactions in two dimensions. Using a spin wave
theory, that allows for the full treatment of the characteristic long-distance
tail of the dipolar intera... | cond-mat_quant-gas |
Liquid crystal phases of two-dimensional dipolar gases and
Berezinskii-Kosterlitz-Thouless melting: Liquid crystals are phases of matter intermediate between crystals and
liquids. Whereas classical liquid crystals have been known for a long time and
are used in electro-optical displays, much less is known about their... | cond-mat_quant-gas |
Manipulating multimer propagation using lattice modulation: We propose a scheme for controlling the movement of dimers, trimers, and
other multimers in optical lattices by modulating the lattice potential. In
deep optical lattices the propagation of deeply bound atomic clusters is slowed
down by the high energy cost of... | cond-mat_quant-gas |
Light scattering in inhomogeneous Tomonaga-Luttinger liquids: We derive the dynamical structure factor for an inhomogeneous
Tomonaga-Luttinger liquid as can be formed in a confined strongly interacting
one-dimensional gas. In view of current experimental progress in the field, we
provide a simple analytic expression fo... | cond-mat_quant-gas |
Short note on the Rabi model: The spectral density of the Rabi model is calculated exactly within a
continued fraction approach. It is shown that the method yields a convergent
solution. | cond-mat_quant-gas |
Prethermal Floquet Steady States and Instabilities in the Periodically
Driven, Weakly Interacting Bose-Hubbard Model: We explore prethermal Floquet steady states and instabilities of the weakly
interacting two-dimensional Bose-Hubbard model subject to periodic driving. We
develop a description of the nonequilibrium d... | cond-mat_quant-gas |
Experimental realization of a non-magnetic one-way spin switch: Controlling magnetism through non-magnetic means is highly desirable for
future electronic devices, as such means typically have ultra-low power
requirements and can provide coherent control. In recent years, great
experimental progress has been made in th... | cond-mat_quant-gas |
Asymptotic Bound-state Model for Feshbach Resonances: We present an Asymptotic Bound-state Model which can be used to accurately
describe all Feshbach resonance positions and widths in a two-body system. With
this model we determine the coupled bound states of a particular two-body
system. The model is based on analyti... | cond-mat_quant-gas |
Feedback-enhanced algorithm for aberration correction of holographic
atom traps: We show that a phase-only spatial light modulator can be used to generate
non-trivial light distributions suitable for trapping ultracold atoms, when the
hologram calculation is included within a simple and robust feedback loop that
corr... | cond-mat_quant-gas |
Exotic photonic molecules via Lennard-Jones-like potentials: Ultracold systems offer an unprecedented level of control of interactions
between atoms. An important challenge is to achieve a similar level of control
of the interactions between photons. Towards this goal, we propose a
realization of a novel Lennard-Jones-... | cond-mat_quant-gas |
Time scale for adiabaticity breakdown in driven many-body systems and
orthogonality catastrophe: The adiabatic theorem is a fundamental result established in the early days
of quantum mechanics, which states that a system can be kept arbitrarily close
to the instantaneous ground state of its Hamiltonian if the latter... | cond-mat_quant-gas |
All-optical transport and compression of ytterbium atoms into the
surface of a solid immersion lens: We present an all-optical method to load 174Yb atoms into a single layer of
an optical trap near the surface of a solid immersion lens which improves the
numerical aperture of a microscope system. Atoms are transporte... | cond-mat_quant-gas |
Large-scale characterization of Cu2O monocrystals via Rydberg excitons: Rydberg states of excitons can reach microns in size and require extremely
pure crystals. We introduce an experimental method for the rapid and
spatially-resolved characterization of Rydberg excitons in copper oxide (Cu2O)
with sub-micron resolutio... | cond-mat_quant-gas |
Leggett collective excitations in a two-band Fermi superfluid at finite
temperatures: The Leggett collective excitations for a two-band Fermi gas with s-wave
pairing and Josephson interband coupling in the BCS-BEC crossover at finite
temperatures are investigated within the Gaussian pair fluctuation approach.
Eigenfr... | cond-mat_quant-gas |
Quantum Charge Pumps with Topological Phases in Creutz Ladder: Quantum charge pumping phenomenon connects band topology through the dynamics
of a one-dimensional quantum system. In terms of a microscopic model, the
Su-Schrieffer-Heeger/Rice-Mele quantum pump continues to serve as a fruitful
starting point for many cons... | cond-mat_quant-gas |
Abnormal Superfluid Fraction of Harmonically Trapped Few-Fermion Systems: Superfluidity is a fascinating phenomenon that, at the macroscopic scale,
leads to dissipationless flow and the emergence of vortices. While these
macroscopic manifestations of superfluidity are well described by theories that
have their origin i... | cond-mat_quant-gas |
Twin matter waves for interferometry beyond the classical limit: Interferometers with atomic ensembles constitute an integral part of modern
precision metrology. However, these interferometers are fundamentally
restricted by the shot noise limit, which can only be overcome by creating
quantum entanglement among the ato... | cond-mat_quant-gas |
Non-thermal fixed points of universal sine-Gordon coarsening dynamics: We examine coarsening of field-excitation patterns of the sine-Gordon (SG)
model, in two and three spatial dimensions, identifying it as universal
dynamics near non-thermal fixed points. The SG model is relevant in many
different contexts, from soli... | cond-mat_quant-gas |
Lifetime of Single-Particle Excitations in a Dilute Bose-Einstein
Condensate at Zero Temperature: We study the lifetime of single-particle excitations in a dilute homogeneous
Bose-Einstein condensate at zero temperature based on a self-consistent
perturbation expansion of satisfying Goldstone's theorem and conservati... | cond-mat_quant-gas |
Symmetric and asymmetric solitons trapped in H-shaped potentials: We report results of numerical and analytical studies of the spontaneous
symmetry breaking in solitons, both two- and one-dimensional, which are trapped
in H-shaped potential profiles, built of two parallel potential troughs linked
by a narrow rung in th... | cond-mat_quant-gas |
Mobile Impurity in a Two-Leg Bosonic Ladder: We study the dynamics of a mobile impurity in a two-leg bosonic ladder. The
impurity moves both along and across the legs and interacts with a bath of
interacting bosonic particles present in the ladder. We use both analytical
(Tomonaga-Luttinger liquid - TLL) and numerical ... | cond-mat_quant-gas |
Spin modulation instabilities and phase separation dynamics in trapped
two-component Bose condensates: In the study of trapped two-component Bose gases, a widely used dynamical
protocol is to start from the ground state of a one-component condensate and
then switch half the atoms into another hyperfine state. The sli... | cond-mat_quant-gas |
Universal subdiffusion in strongly tilted many-body systems: The quantum dynamics away from equilibrium is of fundamental interest for
interacting many-body systems. In this letter, we study tilted many-body
systems using the effective Hamiltonian derived from the microscopic
description. We first give general argument... | cond-mat_quant-gas |
Classical fields and quantum measurement for Bose-Einstein condensate: We analyze a process of splitting of the Bose-Einstein condensate and the
mutual coherence of two separated atomic clouds. Within the classical fields
approximation we show that coherence between clouds is degraded if atoms
interact and if we accoun... | cond-mat_quant-gas |
Acoustic Superradiance from a Bose-Einstein Condensate Vortex with a
Self-Consistent Background Density Profile: The axisymmetric acoustic perturbations in the velocity potential of a
Bose-Einstein condensate in the presence of a single vortex behave like
minimally coupled massless scalar fields propagating in a curv... | cond-mat_quant-gas |
Photon Bose-Condensate as a Tunable Terahertz Laser Source without
Inversion: We develop a theoretical model for a tunable coherent terahertz radiation
source based on the long-lived Bose condensate of photons. In the device we
propose, the original photon pumping is performed incoherently by a blackbody
radiation em... | cond-mat_quant-gas |
The improved Gaussian approximation Calculation of Bogoliubov Mode in
One Dimensional Bosonic Gas: In this paper, we study the homogeneous one-dimensional bosonic gas
interacting via a repulsive contact potential by using the improved Gaussian
approximation. We obtain the gapless excitation spectrum of Bogoliubov mod... | cond-mat_quant-gas |
Full and fractional defects across the Berezinskii-Kosterlitz-Thouless
transition in a driven-dissipative spinor quantum fluid: We investigate the properties of a two-dimensional \emph{spinor} microcavity
polariton system driven by a linearly polarised continuous pump. In particular,
we establish the role of the elem... | cond-mat_quant-gas |
Parametric instability of oscillations of a vortex ring in a
$z$-periodic Bose-Einstein condensate and the recurrence to starting state: The dynamics of deformations of a quantum vortex ring in a Bose-Einstein
condensate with periodic equilibrium density $\rho(z)= 1-\epsilon\cos z$ has
been considered within the loca... | cond-mat_quant-gas |
Propagation of phase-imprinted solitons from superfluid core to
Mott-insulator shell and superfluid shell: We study phase-imprinted solitons of ultracold bosons in an optical lattice
with a harmonic trap, which shows the superfluid (SF) and Mott-insulator (MI)
shell structures. The earlier study [Konstantin V. Krutit... | 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 |
Statics and dynamics of atomic dark-bright solitons in the presence of
delta-like impurities: Adopting a mean-field description for a two-component atomic Bose-Einstein
condensate, we study the stat- ics and dynamics of dark-bright solitons in the
presence of localized impurities. We use adiabatic perturbation theory... | cond-mat_quant-gas |
Parametric Excitation of a 1D Gas in Integrable and Nonintegrable Cases: We study the response of a highly excited 1D gas with pointlike interactions
to a periodic modulation of the coupling constant. We calculate the
corresponding dynamic structure factors and show that their low-frequency
behavior differs dramaticall... | cond-mat_quant-gas |
Dimensional crossover in non-relativistic effective field theory: Isotropic scattering in various spatial dimensions is considered for
arbitrary finite-range potentials using non-relativistic effective field
theory. With periodic boundary conditions, compactifications from a box to a
plane and to a wire, and from a pla... | cond-mat_quant-gas |
On the hydrodynamic canonical formalism of the Gross-Pitaevskii field: We derive a canonical formalism for the hydrodynamic representation of the
Gross-Pitaevskii field (nonlinear Schr\"odinger field), where the density and
the phase of the condensate form a canonical pair of conjugate field variables.
To do so, we tre... | cond-mat_quant-gas |
Skyrmion crystals in the pseudo-spin-1/2 Bose-Einstein condensates: Exact two-dimensional solutions are constructed for the pseudo-spin-1/2
Bose-Einstein condensates which are described by the coupled nonlinear
Gross-Pitaevskii equations where the intraspecies and interspecies coupling
constants are assumed to be equal... | cond-mat_quant-gas |
Phonon-mediated Casimir interaction between finite mass impurities: The Casimir effect, a two-body interaction via vacuum fluctuations, is a
fundamental property of quantum systems. In solid state physics it emerges as a
long-range interaction between two impurity atoms via virtual phonons. In the
classical limit for t... | cond-mat_quant-gas |
Theory of a resonantly interacting impurity in a Bose-Einstein
condensate: We investigate a Bose-Einstein condensate in strong interaction with a single
impurity particle. While this situation has received considerable interest in
recent years, the regime of strong coupling remained inaccessible to most
approaches du... | cond-mat_quant-gas |
Active Learning Algorithm for Computational Physics: In large-scale computation of physics problems, one often encounters the
problem of determining a multi-dimensional function, which can be
time-consuming when computing each point in this multi-dimensional space is
already time-demanding. In the work, we propose that... | cond-mat_quant-gas |
Complex scaling flows in the quench dynamics of interacting particles: Many-body systems driven out of equilibrium can exhibit scaling flows of the
quantum state. For a sudden quench to resonant interactions between particles
we construct a new class of analytical scaling solutions for the time evolved
wave function wi... | cond-mat_quant-gas |
Mott Insulators of Ultracold Fermionic Alkaline Earth Atoms:
Underconstrained Magnetism and Chiral Spin Liquid: We study Mott insulators of fermionic alkaline earth atoms, described by
Heisenberg spin models with enhanced SU(N) symmetry. In dramatic contrast to
SU(2) magnetism, more than two spins are required to for... | cond-mat_quant-gas |
Simultaneous Readout of Noncommuting Collective Spin Observables beyond
the Standard Quantum Limit: We augment the information extractable from a single absorption image of a
spinor Bose-Einstein condensate by coupling to initially empty auxiliary
hyperfine states. Performing unitary transformations in both, the orig... | cond-mat_quant-gas |
On quantum melting of superfluid vortex crystals: from Lifshitz scalar
to dual gravity: Despite a long history of studies of vortex crystals in rotating superfluids,
their melting due to quantum fluctuations is poorly understood. Here we develop
a fracton-elasticity duality to investigate a two-dimensional vortex lat... | cond-mat_quant-gas |
Spatial Patterns of Rydberg Excitations from Logarithmic Pair
Interactions: The collective excitations in ensembles of dissipative, laser driven
ultracold atoms exhibit crystal-like patterns, a many-body effect of the
Rydberg blockade mechanism. These crystalline structure are revealed in
experiment from a post-selec... | cond-mat_quant-gas |
Bose Einstein condensation and superfluidity in an open system: theory: We propose a new theoretical formalism which describes the Bose Einstein
condensation of weakly interacting bosons with finite life time interacting
with a thermal bath. We show that if a quasi-thermal distribution function of
particles is achieved... | cond-mat_quant-gas |
The multiconfigurational time-dependent Hartree method for bosons with
internal degrees of freedom: Theory and composite fragmentation of
multi-component Bose-Einstein condensates: In this paper the multiconfigurational time-dependent Hartree for bosons
method (MCTDHB) is derived for the case of $N$ identical boson... | cond-mat_quant-gas |
Density wave instability in a 2D dipolar Fermi gas: We consider a uniform dipolar Fermi gas in two-dimensions (2D) where the
dipole moments of fermions are aligned by an orientable external field. We
obtain the ground state of the gas in Hartree-Fock approximation and
investigate RPA stability against density fluctuati... | cond-mat_quant-gas |
Mobile impurity probing a two-dimensional superfluid phase transition: The use of atomically sized quantum systems as highly sensitive measuring
devices represents an exciting and quickly growing research field. Here, we
explore the properties of a quasiparticle formed by a mobile impurity
interacting with a two-dimens... | cond-mat_quant-gas |
Effect of Rare Fluctuations on the Thermalization of Isolated Quantum
Systems: We consider the question of thermalization for isolated quantum systems after
a sudden parameter change, a so-called quantum quench. In part icular we
investigate the pre-requisites for thermalization focusing on the statistical
properties... | cond-mat_quant-gas |
Fractional topological states of dipolar fermions in one-dimensional
optical superlattices: We study the properties of dipolar fermions trapped in one-dimensional
bichromatic optical lattices and show the existence of fractional topological
states in the presence of strong dipole-dipole interactions. We find some
int... | cond-mat_quant-gas |
Precise measurements on a quantum phase transition in antiferromagnetic
spinor Bose-Einstein condensates: We investigate, both experimentally and theoretically, the quench dynamics of
antiferromagnetic spinor Bose-Einstein condensates in the vicinity of a zero
temperature quantum phase transition at zero quadratic Ze... | cond-mat_quant-gas |
Unstable Avoided Crossing in Coupled Spinor Condensates: We consider the dynamics of a Bose-Einstein condensate with two internal
states, coupled through a coherent drive. We focus on a specific quench
protocol, in which the sign of the coupling field is suddenly changed. At a
mean-field level, the system is transferre... | cond-mat_quant-gas |
Comment on: `Single-shot simulations of dynamic quantum many-body
systems' [arXiv:1501.03224]: In their recent paper [Nature Physics 15, 451 (2006)], Sakmann and Kasevich
study the formation of fringe patterns in ultra-cold Bose gases and claim:
`Here, we show how single shots can be simulated from numerical solution... | cond-mat_quant-gas |
Tuning an effective spin chain of three strongly interacting
one-dimensional fermions with the transversal confinement: Strongly interacting one-dimensional fermions form an effective spin chain in
the absence of an external lattice potential. We show that the exchange
coefficients of such a chain may be locally tune... | cond-mat_quant-gas |
Dynamics of a Polariton Condensate in an Organic Semiconducting
Microcavity: Recent experiments on thin-film microcavities give evidence of Bose
condensation of exciton-polariton states. Inspired by these observations, we
consider the possibility that such exotic "half-light/half matter" states could
be observed in t... | cond-mat_quant-gas |
Real-Time Dynamics of an Impurity in an Ideal Bose Gas in a Trap: We investigate the behavior of a harmonically trapped system consisting of an
impurity in a dilute ideal Bose gas after the boson-impurity interaction is
suddenly switched on. As theoretical framework, we use a field theory approach
in the space-time dom... | cond-mat_quant-gas |
Unitary dynamics of strongly-interacting Bose gases with time-dependent
variational Monte Carlo in continuous space: We introduce time-dependent variational Monte Carlo for continuous-space Bose
gases. Our approach is based on the systematic expansion of the many-body
wave-function in terms of multi-body correlations... | cond-mat_quant-gas |
Controlling Correlated Tunneling and Superexchange Interactions with
AC-Driven Optical Lattices: The dynamical control of tunneling processes of single particles plays a
major role in science ranging from Shapiro steps in Josephson junctions to the
control of chemical reactions via light in molecules. Here we show ho... | 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 |
Dissipative Transport of Trapped Bose-Einstein Condensates through
Disorder: After almost half a century since the work of Anderson [Phys. Rev. {\bf 109},
1492 (1958)], at present there is no well established theoretical framework for
understanding the dynamics of interacting particles in the presence of
disorder. He... | cond-mat_quant-gas |
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