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6,700 | Impurity Scattering in a Bose-Einstein Condensate at finite temperature | cond-mat.quant-gas | We consider the effects of finite temperature on the scattering of impurity
atoms in a BoseEinstein condensate, showing that the scattering rate is
enhanced by the thermal atoms. Collisions can increase or decrease the impurity
energy. Below the Landau velocity only the first process occurs, i.e., the
collisions cool t... | physics |
6,701 | Macroscopic Quantum Coherence in a repulsive Bose-Einstein condensate | cond-mat.quant-gas | We consider a Bose-Einstein bicondensate (BEC) of $^{87}Rb$, trapped in two
different internal levels, in a situation where the density undergoes a
symmetry breaking in momentum space. This occurs for a suitable number of
condensed atoms within a double well dispersion curve, obtained by Raman
coupling two internal sta... | physics |
6,702 | Bose-Einstein condensation into non-equilibrium states studied by condensate focusing | cond-mat.quant-gas | We report the formation of Bose-Einstein condensates into non-equilibrium
states. Our condensates are much longer than equilibrium condensates with the
same number of atoms, show strong phase fluctuations, and have a dynamical
evolution similar to that of quadrupole shape oscillations of regular
condensates. The conden... | physics |
6,703 | Bose-Einstein condensation in a magnetic double-well potential | cond-mat.quant-gas | We present the first experimental realisation of Bose-Einstein condensation
in a purely magnetic double-well potential. This has been realised by combining
a static Ioffe-Pritchard trap with a time orbiting potential (TOP). The double
trap can be rapidly switched to a single harmonic trap of identical oscillation
frequ... | physics |
6,704 | Shape oscillations in non-degenerate Bose gases - transition from the collisionless to the hydrodynamic regime | cond-mat.quant-gas | We investigate collective oscillations of non-degenerate clouds of Rb-87
atoms as a function of density in an elongated magnetic trap. For the low-lying
M=0 monopole-quadrupole shape oscillation we measure the oscillation
frequencies and damping rates. At the highest densities the mean-free-path is
smaller than the axi... | physics |
6,705 | Time-Averaged Adiabatic Potentials: Versatile traps and waveguides for ultracold quantum gases | cond-mat.quant-gas | We demonstrate a novel class of trapping potentials, time-averaged adiabatic
potentials (TAAP) which allows the generation of a large variety of traps and
waveguides for ultracold atoms. Multiple traps can be coupled through
controllable tunneling barriers or merged altogether. We present analytical
expressions for pan... | physics |
6,706 | Many-body approach to low-lying collective excitations in a BEC approaching collapse | cond-mat.quant-gas | 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
interaction parameter $\lambda=\frac{Aa_{s}}{a_{ho}}$. Significant difference
from the variationa... | physics |
6,707 | Antiferromagnetic Order of Repulsively Interacting Fermions on Optical lattices | cond-mat.quant-gas | The N\'eel state in fermionic mixtures of two pseudospin species in an
optical lattice is analyzed at low temperatures. Experimentally it remains a
challenge to demonstrate antiferromagnetic correlations in ultracold fermionic
quantum gases. We find that, while in balanced systems the N\'eel order
parameter can point i... | physics |
6,708 | Evaporative depolarization and spin transport in a unitary trapped Fermi gas | cond-mat.quant-gas | We consider a partially spin-polarized atomic Fermi gas in a
high-aspect-ratio trap, with a flux of predominantly spin-up atoms exiting the
center of the trap. We argue that such a scenario can be produced by
evaporative cooling, and we find that it can result in a substantially
non-equilibrium polarization pattern for... | physics |
6,709 | Repulsive Fermi gas in a harmonic trap: Ferromagnetism and spin textures | cond-mat.quant-gas | We study ferromagnetism in a repulsively interacting two-component Fermi gas
in a harmonic trap. Within a local density approximation, the two components
phase-separate beyond a critical interaction strength, with one species having
a higher density at the trap center. We discuss several easily observable
experimental ... | physics |
6,710 | Probing interaction-induced ferromagnetism in optical superlattices | cond-mat.quant-gas | We propose a controllable method for observing interaction induced
ferromagnetism in ultracold fermionic atoms loaded in optical superlattices. We
first discuss how to probe and control Nagaoka ferromagnetism in an array of
isolated plaquettes (four lattice sites arranged in a square). Next, we show
that introducing a ... | physics |
6,711 | Drag force on an impurity below the superfluid critical velocity in a quasi-one-dimensional Bose-Einstein condensate | cond-mat.quant-gas | The existence of frictionless flow below a critical velocity for obstacles
moving in a superfluid is well established in the context of the mean-field
Gross-Pitaevskii theory. We calculate the next order correction due to quantum
and thermal fluctuations and find a non-zero force acting on a delta-function
impurity mov... | physics |
6,712 | Theory of domain formation in inhomogeneous ferromagnetic dipolar condensates | cond-mat.quant-gas | Recent experimental studies of $^{87}$Rb spinor Bose Einstein condensates
have shown the existence of a magnetic field driven quantum phase transition
accompanied by structure formation on the ferromagnetic side of the transition.
In this theoretical study we examine the dynamics of the unstable modes
following the tra... | physics |
6,713 | Spectral Functions and rf Response of Ultracold Fermionic Atoms | cond-mat.quant-gas | We present a calculation of the spectral functions and the associated rf
response of ultracold fermionic atoms near a Feshbach resonance. The single
particle spectra are peaked at energies that can be modeled by a modified BCS
dispersion. However, even at very low temperatures their width is comparable to
their energy,... | physics |
6,714 | Quantum Phase Transitions in a Dimerized Bose-Hubbard Model: A DMRG Study | cond-mat.quant-gas | We investigate the phase diagram of a dimerized Bose-Hubbard model, using
density matrix renormalization group technique. We find a new phase, which is
the coexistence of superfluid and bond-wave phases, due to the effect of
dimerization. Experimentally dimerization in optical lattice can be realized by
using two count... | physics |
6,715 | In-situ Observation of Incompressible Mott-Insulating Domains of Ultracold Atomic Gases | cond-mat.quant-gas | We present a direct measurement of the density profile of a two-dimensional
Mott Insulator formed by ultracold atoms in an optical lattice. High resolution
absorption imaging is used to probe the "wedding-cake" structure of a trapped
gas as it crosses the boundary from a unit-filled Mott insulating phase to the
superfl... | physics |
6,716 | Induced interaction and crystallization of self-localized impurity fields in a Bose-Einstein condensate | cond-mat.quant-gas | 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 uniform miscible
system and show the importance of surface tension for self localization of the
impurity fiel... | physics |
6,717 | Density ripples in expanding low-dimensional gases as a probe of correlations | cond-mat.quant-gas | We investigate theoretically the evolution of the two-point density
correlation function of a low-dimensional ultracold Bose gas after release from
a tight transverse confinement. In the course of expansion thermal and quantum
fluctuations present in the trapped systems transform into density
fluctuations. For the case... | physics |
6,718 | Rapid phase-diffusion between atomic and molecular Bose-Einstein condensates | cond-mat.quant-gas | We study the collisional loss of atom-molecule coherence after coherently
dissociating a small fraction of a molecular Bose-Einstein condensate into
atoms. The obtained $n$-atoms states are two-atom (SU(1,1)) coherent states
with number variance $\Delta n\propto n$ compared to $\Delta n\propto \sqrt{n}$
for the spin (S... | physics |
6,719 | An ultra-cold, molecular Rydberg plasma with exceptionally long lifetime and strongly-coupled properties formed by threshold laser excitation in the expansion region of a supersonic jet | cond-mat.quant-gas | An ultra-cold molecular plasma with extraordinarily long lifetime (~0.5 ms)
is generated under strong collisional cooling conditions in the expansion
region of a seeded supersonic jet expansion close to the nozzle. A resonant
two-photon one-color laser process excites para-difluorobenzene molecules into
the high-n Rydb... | physics |
6,720 | Some properties of a long lifetime strongly-coupled molecular plasma produced by high Rydberg excitation of nitric oxide in a supersonic free jet | cond-mat.quant-gas | A long life-time (>0.3 ms) strongly-coupled molecular Rydberg plasma is
generated by the excitation of nitric oxide into the high-n Rydberg threshold
region in the high-density region of a supersonic jet expansion. After 310 \mus
the plasma has expanded to a size of ca. 3 cm. When subjected to very small DC
fields from... | physics |
6,721 | Spontaneous pattern formation in an anti-ferromagnetic quantum gas | cond-mat.quant-gas | Spontaneous pattern formation is a phenomenon ubiquitous in nature, examples
ranging from Rayleigh-Benard convection to the emergence of complex organisms
from a single cell. In physical systems, pattern formation is generally
associated with the spontaneous breaking of translation symmetry and is closely
related to ot... | physics |
6,722 | A supercritical superfluid and vortex unbinding following a quantum quench | cond-mat.quant-gas | We study the dynamics of the relative phase of a bilayer of two-dimensional
superfluids after the two superfluids have been decoupled, using truncated
Wigner approximation. On short time scales the relative phase shows "light
cone" like thermalization and creates a metastable superfluid state, which can
be supercritica... | physics |
6,723 | Creation and detection of vortices in polariton condensates | cond-mat.quant-gas | We investigate theoretically the creation, persistence and detection of
quantized vortices in nonequilibrium polariton condensates within a stochastic
classical field model. The life time of the quantized vortices is shown to
increase with the spatial coherence and to depend on the geometry of the
condensate. The relat... | physics |
6,724 | Vortex nucleation as a case study of symmetry breaking in quantum systems | cond-mat.quant-gas | Mean-field methods are a very powerful tool for investigating weakly
interacting many-body systems in many branches of physics. In particular, they
describe with excellent accuracy trapped Bose-Einstein condensates. A generic,
but difficult question concerns the relation between the symmetry properties of
the true many... | physics |
6,725 | Rapid production of $^{87}$Rb BECs in a combined magnetic and optical potential | cond-mat.quant-gas | We describe an apparatus for quickly and simply producing $\Rb87$
Bose-Einstein condensates. It is based on a magnetic quadrupole trap and a red
detuned optical dipole trap. We collect atoms in a magneto-optical trap (MOT)
and then capture the atom in a magnetic quadrupole trap and force rf
evaporation. We then transfe... | physics |
6,726 | Stability and chaotic behavior of Bose-Einstein condensates in optical lattices with two- and three-body interactions | cond-mat.quant-gas | The stability and chaotic behaviors of Bose-Einstein condensates with two-
and three-atom interactions in optical lattices are discussed with analytical
and numerical methods. It is found that the steady-state relative population
appears tuning-fork bifurcation when the system parameters are changed to
certain critical... | physics |
6,727 | Feshbach resonant scattering of three fermions in one-dimensional wells | cond-mat.quant-gas | We study the weak-tunnelling limit for a system of cold 40K atoms trapped in
a one-dimensional optical lattice close to an s-wave Feshbach resonance. We
calculate the local spectrum for three atoms at one site of the lattice within
a two-channel model. Our results indicate that, for this one-dimensional
system, one- an... | physics |
6,728 | Phase Diagrams for Spin-1 Bosons in an Optical Lattice | cond-mat.quant-gas | In this paper, the phase diagrams of a polar spin-1 Bose gas in a
three-dimensional optical lattice with linear and quadratic Zeeman effects both
at zero and finite temperatures are obtained within mean-field theory. The
phase diagrams can be regrouped to two different parameter regimes depending on
the magnitude of th... | physics |
6,729 | Disorder effects during the evolution from BCS to BEC superfluidity | cond-mat.quant-gas | We describe the effects of disorder on the critical temperature of s-wave
superfluids from the BCS to the BEC regime, with direct application to
ultracold Fermi atoms. In the BCS regime the pair breaking and phase coherence
temperature scales are essentially the same allowing strong correlations
between the amplitude a... | physics |
6,730 | Spin-1/2 fermions with attractive interaction in an optical lattice | cond-mat.quant-gas | We study attractive fermions in an optical lattice superimposed by a trapping
potential, such that fermions may form bosonic molecules. We map the model onto
nonlinear field equations depending on the Nambu-Gor'kov propagator. The
resulting field equations where solved numerically by a relaxation technique
that allowed... | physics |
6,731 | Comment on "Spectral Signatures of the Fulde-Ferrell-Larkin-Ovchinnikov Order Parameter in One-Dimensional Optical lattices" | cond-mat.quant-gas | Comment on "Spectral Signatures of the Fulde-Ferrell-Larkin-Ovchinnikov Order
Parameter in One-Dimensional Optical lattices" M. Reza Bakhtiari, M. J.
Leskinen, and P. T\"orm\"a, Phys. Rev. lett. {\bf 101}, 120404 (2008). | physics |
6,732 | Bakhtiari, Leskinen and Torma Reply | cond-mat.quant-gas | This is a Reply to: Comment on "Spectral Signatures of the
Fulde-Ferrell-Larkin-Ovchinnikov Order Parameter in One-Dimensional Optical
Lattices" R. A. Molina J. Dukelksy, and P. Schmitteckert, Phys. Rev. Lett. 102,
168901 (2009) | physics |
6,733 | Phase Diagram of Bosons in Two-Color Superlattices from Experimental Parameters | cond-mat.quant-gas | We study the zero-temperature phase diagram of a gas of bosonic 87-Rb atoms
in two-color superlattice potentials starting directly from the experimental
parameters, such as wavelengths and intensities of the two lasers generating
the superlattice. In a first step, we map the experimental setup to a
Bose-Hubbard Hamilto... | physics |
6,734 | Anomalous suppression of the Bose glass at commensurate fillings in the disordered Bose-Hubbard model | cond-mat.quant-gas | We study the weakly disordered Bose-Hubbard model on a cubic lattice through
a one-loop renormalization group analysis of the corresponding effective field
theory which is explicitly derived by combining a strong-coupling expansion
with a replica average over the disorder. The method is applied not only to
generic unco... | physics |
6,735 | Inter-species Tunneling in One-dimensional Bose Mixtures | cond-mat.quant-gas | We study the ground-state properties and quantum dynamics of few-boson
mixtures with strong inter-species repulsion in one-dimensional traps. If one
species localizes at the center, e.g., due to a very large mass compared to the
other component, it represents an effective barrier for the latter and the
system can be ma... | physics |
6,736 | Hopping modulation in a one-dimensional Fermi-Hubbard Hamiltonian | cond-mat.quant-gas | We consider a strongly repulsive two-component Fermi gas in a one-dimensional
(1D) optical lattice described in terms of a Hubbard Hamiltonian. We analyze
the response of the system to a periodic modulation of the hopping amplitude in
presence of large two body interaction. By (essentially) exact simulations of
the tim... | physics |
6,737 | Generalized harmonic-fluid approach for the off-diagonal correlations of a one-dimensional interacting Bose gas | cond-mat.quant-gas | We develop a generalized harmonic-fluid approach, based on a regularization
of the effective low-energy Luttinger-liquid Hamiltonian, for a one-dimensional
Bose gas with repulsive contact interactions. The method enables us to compute
the complete series corresponding to the large-distance, off-diagonal behavior
of the... | physics |
6,738 | Zero-temperature phase transitions in dilute bosonic superfluids on a lattice | cond-mat.quant-gas | Kinetic energy driven phase transitions in Bose superfluids occur at low
values of the repulsion when the values of the next-to-nearest and
next-to-next-to-nearest hopping term attain certain critical values, resulting
in alterations in the wave vector of the condensate. We map out the space of
possible phases allowed ... | physics |
6,739 | First and second sound in a strongly interacting Fermi gas | cond-mat.quant-gas | Using a variational approach, we solve the equations of two-fluid
hydrodynamics for a uniform and trapped Fermi gas at unitarity. In the uniform
case, we find that the first and second sound modes are remarkably similar to
those in superfluid Helium, a consequence of strong interactions. In the
presence of harmonic tra... | physics |
6,740 | The physics of dipolar bosonic quantum gases | cond-mat.quant-gas | This article reviews the recent theoretical and experimental advances in the
study of ultracold gases made of bosonic particles interacting via the
long-range, anisotropic dipole-dipole interaction, in addition to the
short-range and isotropic contact interaction usually at work in ultracold
gases. The specific propert... | physics |
6,741 | Quantum dynamics of cavity assisted photoassociation of Bose-Einstein condensed atoms | cond-mat.quant-gas | We explore the quantum dynamics of photoassociation of Bose-Einstein
condensed atoms into molecules using an optical cavity field. Inside of an
optical resonator, photoassociation of quantum degenerate atoms involves the
interaction of three coupled quantum fields for the atoms, molecules, and the
photons. The feedback... | physics |
6,742 | Decoherence and entanglement in a bosonic Josephson junction: Bose-enhanced quantum-Zeno control of phase-diffusion | cond-mat.quant-gas | We study the effect of decoherence on dynamical phase diffusion in the
two-site Bose-Hubbard model. Starting with an odd parity excited coherent
state, the initial loss of single particle coherence varies from small bound
oscillations in the Rabi regime, through hyperbolic depletion in the Josephson
regime, to a Gaussi... | physics |
6,743 | A high-flux 2D MOT source for cold lithium atoms | cond-mat.quant-gas | We demonstrate a novel 2D MOT beam source for cold 6Li atoms. The source is
side-loaded from an oven operated at temperatures in the range 600<T<700 K. The
performance is analyzed by loading the atoms into a 3D MOT located 220 mm
downstream from the source. The maximum recapture rate of ~10^9 /s is obtained
for T=700 K... | physics |
6,744 | Supersolidity of cold-atom Bose-Fermi mixtures in optical lattices | cond-mat.quant-gas | We investigate a cold atomic mixture of spinless bosons and fermions in
two-dimensional optical lattices. In the presence of a nested Fermi surface,
the bosons may develop a fascinating supersolid behavior characterized by a
finite superfluid density as well as a spatial density wave order. Focusing on
the triangular l... | physics |
6,745 | Mesoscopic quantum switching of a Bose-Einstein condensate in an optical lattice governed by the parity of the number of atoms | cond-mat.quant-gas | It is shown that for a $N$-boson system the parity of $N$ can be responsible
for a qualitative difference in the system response to variation of a
parameter. The nonlinear boson model is considered, which describes tunneling
of boson pairs between two distinct modes $X_{1,2}$ of the same energy and
applies to a Bose-Ei... | physics |
6,746 | Atomic Josephson junction with two bosonic species | cond-mat.quant-gas | We study an atomic Josephson junction (AJJ) in presence of two interacting
Bose-Einstein condensates (BECs) confined in a double well trap. We assume that
bosons of different species interact with each other. The macroscopic wave
functions of the two components obey to a system of two 3D coupled
Gross-Pitaevskii equati... | physics |
6,747 | Localization by bichromatic potentials versus Anderson localization | cond-mat.quant-gas | The one-dimensional propagation of waves in a bichromatic potential may be
modeled by the Aubry-Andr\'e Hamiltonian. The latter presents a
delocalization-localization transition, which has been observed in recent
experiments using ultracold atoms or light. It is shown here that, in contrast
to Anderson localization, th... | physics |
6,748 | Mixtures of Bose Gases Confined in a Ring Potential | cond-mat.quant-gas | The rotational properties of a mixture of two distinguishable Bose gases that
are confined in a ring potential provide novel physical effects that we
demonstrate in this study. Persistent currents are shown to be stable for a
range of the population imbalance between the two components at low angular
momentum. At highe... | physics |
6,749 | Collapse instability of solitons in the nonpolynomial Schrödinger equation with dipole-dipole interactions | cond-mat.quant-gas | A model of the Bose-Einstein condensate (BEC) of dipolar atoms, confined in a
combination of a cigar-shaped trap and optical lattice acting in the axial
direction, is studied in the framework of the one-dimensional (1D)
nonpolynomial Schr\"{o}dinger equation (NPSE) with additional terms describing
long-range dipole-dip... | physics |
6,750 | Transport of ultracold Bose gases beyond the Gross-Pitaevskii description | cond-mat.quant-gas | We explore atom-laser-like transport processes of ultracold Bose-condensed
atomic vapors in mesoscopic waveguide structures beyond the Gross-Pitaevskii
mean-field theory. Based on a microscopic description of the transport process
in the presence of a coherent source which models the outcoupling from a
reservoir of per... | physics |
6,751 | Critical temperature of a Bose gas in an optical lattice | cond-mat.quant-gas | We present theory for the critical temperature of a Bose gas in a combined
harmonic lattice potential based on a mean-field description of the system. We
develop practical expressions for the ideal-gas critical temperature, and
corrections due to interactions, the finite-size effect, and the occupation of
excited bands... | physics |
6,752 | Suppression of the critical temperature for superfluidity near the Mott transition: validating a quantum simulator | cond-mat.quant-gas | Ultracold atomic gases in optical lattices have proven to be a controllable,
tunable and clean implementation of strongly interacting quantum many-body
systems. An essential prospect for such quantum simulators is their ability to
map out the phase diagram of fundamental many-body model Hamiltonians. However,
the resul... | physics |
6,753 | Condensate density of interacting bosons: a functional renormalization group approach | cond-mat.quant-gas | We calculate the temperature dependent condensate density $\rho^0 (T)$ of
interacting bosons in three dimensions using the functional renormalization
group (FRG). From the numerical solution of suitably truncated FRG flow
equations for the irreducible vertices we obtain $\rho^0 (T)$ for arbitrary
temperatures. We caref... | physics |
6,754 | Polarization Suppression and Nonmonotonic Local Two-Body Correlations in the Two-Component Bose Gas in One Dimension | cond-mat.quant-gas | We study the interplay of quantum statistics, strong interactions and finite
temperatures in the two-component (spinor) Bose gas with repulsive
delta-function interactions in one dimension. Using the Thermodynamic Bethe
Ansatz, we obtain the equation of state, population densities and local density
correlation numerica... | physics |
6,755 | On the kinetic energy of unitary Fermi gas in a harmonic trap | cond-mat.quant-gas | We have considered the orbital-free approximation of the kinetic energy
functional to investigate the zero temperature properties of dilute
harmonically trapped two component Fermi gas at unitarity. It is shown that our
approach provides a realible and inexpensive method to study superfluid
strongly interacting dilute ... | physics |
6,756 | Frustrated Bose condensates in optical lattices | cond-mat.quant-gas | We study the Bose-condensed ground states of bosons in a two-dimensional
optical lattice in the presence of frustration due to an effective vector
potential, for example, due to lattice rotation. We use a mapping to a large-S
frustrated magnet to study quantum fluctuations in the condensed state. Quantum
effects are in... | physics |
6,757 | Non-destructive cavity QED probe of Bloch oscillations in a gas of ultracold atoms | cond-mat.quant-gas | We describe a scheme for probing a gas of ultracold atoms trapped in an
optical lattice and moving in the presence of an external potential. The probe
is non-destructive and uses the existing lattice fields as the measurement
device. Two counter-propagating cavity fields simultaneously set up a
conservative lattice pot... | physics |
6,758 | Signature of the FFLO phase in the collective modes of a trapped ultracold Fermi gas | cond-mat.quant-gas | We study theoretically the collective modes of a two-component Fermi gas with
attractive interactions in a quasi-one-dimensional harmonic trap. We focus on
an imbalanced gas in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase. Using a
mean-field theory, we study the response of the ground state to time-dependent
poten... | physics |
6,759 | Two-photon nonlinear spectroscopy of periodically trapped ultracold atoms in a cavity | cond-mat.quant-gas | We study the transmission spectra of a Bose Einstein condensate confined in
an optical lattice interacting with two modes of a cavity via nonlinear
two-photon transition. In particular we show that a nonlinear two-photon
interaction between the superfluid (SF) phase and the Mott insulating (MI)
phase of a Bose-Einstein... | physics |
6,760 | Counterflow and paired superfluidity in one-dimensional Bose mixtures in optical lattices | cond-mat.quant-gas | We study the quantum phases of mixtures of ultra-cold bosonic atoms held in
an optical lattice that confines motion or hopping to one spatial dimension.
The phases are found by using Tomonaga-Luttinger liquid theory as well as the
numerical method of time evolving block decimation (TEBD). We consider a binary
mixture w... | physics |
6,761 | Entropy exchange in a mixture of ultracold atoms | cond-mat.quant-gas | We investigate experimentally the entropy transfer between two
distinguishable atomic quantum gases at ultralow temperatures. Exploiting a
species-selective trapping potential, we are able to control the entropy of one
target gas in presence of a second auxiliary gas. With this method, we drive
the target gas into the ... | physics |
6,762 | Induced supersolidity in a normal and hardcore boson mixture | cond-mat.quant-gas | It is well known that the supersolid form of matter can arise in a single
species of cold bosonic atoms in an optical lattice due to long range
interactions. We present a scenario where a supersolid is induced in one of the
components of a mixture of two species bosonic atoms where there is no long
range interactions. ... | physics |
6,763 | Exotic superfluidity in cold atoms | cond-mat.quant-gas | We derived the low energy effective action for the collective modes in
asymmetric fermionic systems with attractive interaction. We obtained the phase
diagram in terms of the chemical potentials. It features a stable gapless
superfluidity with one Fermi surface on the BEC side of the resonance. Also we
predict a sharp ... | physics |
6,764 | Transition region properties of a trapped quasi-two-dimensional degenerate Bose gas | cond-mat.quant-gas | The c-field simulation technique is used to study a trapped quasi-two
dimensional Bose gas. We calculate the central curvature of the system density
and fluctuations of the condensate mode in the degenerate regime. These results
provide new understanding of the system behavior in the region of the
superfluid transition... | physics |
6,765 | Cavity Quantum Optomechanics of Ultracold Atoms in an Optical Lattice: Normal-Mode Splitting | cond-mat.quant-gas | We consider the dynamics of a movable mirror (cantilever) of a cavity coupled
through radiation pressure to the light scattered from ultracold atoms in an
optical lattice. Scattering from different atomic quantum states creates
different quantum states of the scattered light, which can be distinguished by
measurements ... | physics |
6,766 | Berry Phase in Atom-Molecule Conversion Systems and Fractional Monopole | cond-mat.quant-gas | We investigate the geometric phase or Berry phase of adiabatic quantum
evolution in an atom-molecule conversion system, and find that the Berry phase
in such system consists of two parts: the usual Berry connection term and a
novel term from the nonlinearity brought forth by the atom-molecule conversion.
The geometric ... | physics |
6,767 | Phase Separation and Dynamics of Two-component Bose-Einstein Condensates | cond-mat.quant-gas | We study the interactions between two atomic species in a binary
Bose-Einstein condensate to revisit the conditions for miscibility, oscillatory
dynamics between the species, steady state solutions and their stability. By
employing a variational approach for a quasi one-dimensional, two-atomic
species, condensate we ob... | physics |
6,768 | Controlled localization of interacting bosons in a disordered optical lattice | cond-mat.quant-gas | We show that tunneling and localization properties of interacting ultracold
atoms in an optical lattice can be controlled by adiabatically turning on a
fast oscillatory force even in the presence of disorder. Our calculations are
based on the exact solution of the time-dependent Schroedinger equation, using
the Floquet... | physics |
6,769 | Zero Sound in Dipolar Fermi Gases | cond-mat.quant-gas | We study the propagation of sound in a homogeneous dipolar gas at zero
temperature, known as zero sound. We find that undamped sound propagation is
possible only in a range of solid angles around the direction of polarization
of the dipoles. Above a critical dipole moment, we find an unstable mode, by
which the gas col... | physics |
6,770 | Pseudogap in fermionic density of states in the BCS-BEC crossover of atomic Fermi gases | cond-mat.quant-gas | We study pseudogap behaviors of ultracold Fermi gases in the BCS-BEC
crossover region. We calculate the density of states (DOS), as well as the
single-particle spectral weight, above the superfluid transition temperature
$T_{\rm c}$ including pairing fluctuations within a $T$-matrix approximation.
We find that DOS exhi... | physics |
6,771 | Vortices in dipolar condensates with dominant dipolar interactions | cond-mat.quant-gas | We present full three-dimensional numerical calculations of single vortex
states in rotating dipolar condensates. We consider a Bose-Einstein condensate
of 52Cr atoms with dipole-dipole and s-wave contact interactions confined in an
axially symmetric harmonic trap. We obtain the vortex states by numerically
solving the... | physics |
6,772 | BCS-BEC crossover with unequal mass fermions | cond-mat.quant-gas | We investigate the crossover from BCS pairing to molecular BEC in an atomic
gas with two fermion species with masses $m_\up \ne m_\dn$ tuned through a
Feshbach resonance. We present results for the T=0 equation of state as a
function of the scattering length including the effects of Gaussian
fluctuations about the mean... | physics |
6,773 | A Universal Trimer in a Three-Component Fermi Gas | cond-mat.quant-gas | We show that the recently measured magnetic field dependence of three-body
loss in a three-component mixture of ultracold $^6$Li atoms [1,2] can be
explained by the presence of a universal trimer state. Previous work suggested
a universal trimer state as a probable explanation, yet failed to get good
agreement between ... | physics |
6,774 | Feynman path-integral treatment of the BEC-impurity polaron | cond-mat.quant-gas | The description of an impurity atom in a Bose-Einstein condensate can be cast
in the form of Frohlich's polaron Hamiltonian, where the Bogoliubov excitations
play the role of the phonons. An expression for the corresponding polaronic
coupling strength is derived, relating the coupling strength to the scattering
lengths... | physics |
6,775 | Finite temperature theory of superfluid bosons in optical lattices | cond-mat.quant-gas | A practical finite temperature theory is developed for the superfluid regime
of a weakly interacting Bose gas in an optical lattice with additional harmonic
confinement. We derive an extended Bose-Hubbard model that is valid for shallow
lattices and when excited bands are occupied. Using the
Hartree-Fock-Bogoliubov-Pop... | physics |
6,776 | Dark soliton decay due to trap anharmonicity in atomic Bose-Einstein condensates | cond-mat.quant-gas | A number of recent experiments with nearly pure atomic Bose-Einstein
condensates have confirmed the predicted dark soliton oscillations when under
harmonic trapping. However, a dark soliton propagating in an inhomogeneous
condensate has also been predicted to be unstable to the emission of sound
waves. Although harmoni... | physics |
6,777 | Excitation spectrum of Mott shells in optical lattices | cond-mat.quant-gas | We theoretically study the excitation spectrum of confined macroscopic
optical lattices in the Mott-insulating limit. For large systems, a fast
numerical method is proposed to calculate the ground state filling and
excitation energies. We introduce many-particle on-site energies capturing
multi-band effects and discuss... | physics |
6,778 | Effect of realistic interatomic interactions and two-body correlation on the heat capacity of a trapped BEC | cond-mat.quant-gas | An approximate many-body theory has been used to calculate the heat capacity
and the condensate fraction of a BEC with effective repulsive interaction. The
effect of interactions has been analyzed and compared with the non-interacting
case. It has been found that the repulsive interaction lowers the critical
temperatur... | physics |
6,779 | Radio-frequency dressing of multiple Feshbach resonances | cond-mat.quant-gas | We demonstrate and theoretically analyze the dressing of several proximate
Feshbach resonances in Rb-87 using radio-frequency (rf) radiation. We present
accurate measurements and characterizations of the resonances, and the dramatic
changes in scattering properties that can arise through the rf dressing. Our
scattering... | physics |
6,780 | Is an Ultra-Cold Strongly Interacting Fermi Gas a Perfect Fluid? | cond-mat.quant-gas | Fermi gases with magnetically tunable interactions provide a clean and
controllable laboratory system for modeling interparticle interactions between
fermions in nature. The s-wave scattering length, which is dominant a low
temperature, is made to diverge by tuning near a collisional (Feshbach)
resonance. In this regim... | physics |
6,781 | Vortex nucleation in mesoscopic Bose superfluid and breaking of the parity symmetry | cond-mat.quant-gas | We analyze vortex nucleation in mezoscopic 2D Bose superfluid in a rotating
trap. We explicitly include a weakly anisotropic stirring potential, breaking
thus explicitly the axial symmetry. As the rotation frequency passes the
critical value $\Omega_c$ the system undergoes an extra symmetry
change/breaking. Well below ... | physics |
6,782 | Antiferromagnetic noise correlations in optical lattices | cond-mat.quant-gas | We analyze how noise correlations probed by time-of-flight (TOF) experiments
reveal antiferromagnetic (AF) correlations of fermionic atoms in
two-dimensional (2D) and three-dimensional (3D) optical lattices. Combining
analytical and quantum Monte Carlo (QMC) calculations using experimentally
realistic parameters, we sh... | physics |
6,783 | Coherence time of a Bose-Einstein condensate | cond-mat.quant-gas | Temporal coherence is a fundamental property of macroscopic quantum systems,
such as lasers in optics and Bose-Einstein condensates in atomic gases and it
is a crucial issue for interferometry applications with light or matter waves.
Whereas the laser is an "open" quantum system, ultracold atomic gases are
weakly coupl... | physics |
6,784 | Two-dimensional boson-fermion mixtures | cond-mat.quant-gas | Using mean-field theory, we study the equilibrium properties of boson-fermion
mixtures confined in a harmonic pancake-shaped trap at zero temperature. When
the modulus of the s-wave scattering lengths are comparable to the mixture
thickness, two-dimensional scattering events introduce a logarithmic dependence
on densit... | physics |
6,785 | Generalized nonpolynomial Schrodinger equations for matter waves under anisotropic transverse confinement | cond-mat.quant-gas | Starting from the three-dimensional Gross-Pitaevskii equation we derive a 1D
generalized nonpolynomial Schrodinger equation, which describes the dynamics of
Bose-Einstein condensates under the action of a generic potential in the
longitudinal axial direction and of an anisotropic harmonic potential in the
transverse ra... | physics |
6,786 | Versatile transporter apparatus for experiments with optically trapped Bose-Einstein condensates | cond-mat.quant-gas | We describe a versatile and simple scheme for producing magnetically and
optically-trapped Rb-87 Bose-Einstein condensates, based on a moving-coil
transporter apparatus. The apparatus features a TOP trap that incorporates the
movable quadrupole coils used for magneto-optical trapping and long-distance
magnetic transpor... | physics |
6,787 | Many-body physics in the radio frequency spectrum of lattice bosons | cond-mat.quant-gas | We calculate the radio-frequency spectrum of a trapped cloud of cold bosonic
atoms in an optical lattice. Using random phase and local density
approximations we produce both trap averaged and spatially resolved spectra,
identifying simple features in the spectra that reveal information about both
superfluidity and corr... | physics |
6,788 | Three-vortex configurations in trapped Bose-Einstein condensates | cond-mat.quant-gas | We report on the creation of three-vortex clusters in a $^{87}Rb$
Bose-Einstein condensate by oscillatory excitation of the condensate. This
procedure can create vortices of both circulation, so that we are able to
create several types of vortex clusters using the same mechanism. The
three-vortex configurations are dom... | physics |
6,789 | Free Expansion of a Weakly-interacting Dipolar Fermi Gas | cond-mat.quant-gas | We theoretically investigate a polarized dipolar Fermi gas in free expansion.
The inter-particle dipolar interaction deforms phase-space distribution in trap
and also in the expansion. We exactly predict the minimal quadrupole
deformation in the expansion for the high-temperature Maxwell-Boltzmann and
zero-temperature ... | physics |
6,790 | Density profiles and density oscillations of an interacting three-component normal Fermi gas | cond-mat.quant-gas | We use a semiclassical approximation to investigate density variations and
dipole oscillations of an interacting three-component normal Fermi gas in a
harmonic trap. We consider both attractive and repulsive interactions between
different pairs of fermions and study the effect of population imbalance on
densities. We f... | physics |
6,791 | Self-consistent Single-band Approximation for Interacting Boson Systems | cond-mat.quant-gas | Traditionally, the single-band approximation for interacting many-body
systems is done with pre-determined single-particle Wannier functions, ignoring
the dependence of the Wannier function on interaction. We show that the
single-band approximation has to be done self-consistently to properly account
the interaction ef... | physics |
6,792 | Infrared behavior and spectral function of a Bose superfluid at zero temperature | cond-mat.quant-gas | In a Bose superfluid, the coupling between transverse (phase) and
longitudinal fluctuations leads to a divergence of the longitudinal correlation
function, which is responsible for the occurrence of infrared divergences in
the perturbation theory and the breakdown of the Bogoliubov approximation. We
report a non-pertur... | physics |
6,793 | Anharmonicity Induced Resonances for Ultracold Atoms and their Detection | cond-mat.quant-gas | When two atoms interact in the presence of an anharmonic potential, such as
an optical lattice, the center of mass motion cannot be separated from the
relative motion. In addition to generating a confinement-induced resonance (or
shifting the position of an existing Feshbach resonance), the external
potential changes t... | physics |
6,794 | Spin drag in noncondensed Bose gases | cond-mat.quant-gas | We show how time-dependent magnetic fields lead to spin motive forces and
spin drag in a spinor Bose gas. We propose to observe these effects in a
toroidal trap and analyze this particular proposal in some detail. In the
linear-response regime we define a transport coefficient that is analogous to
the usual drag resist... | physics |
6,795 | Core sizes and dynamical instabilities of giant vortices in dilute Bose-Einstein condensates | cond-mat.quant-gas | Motivated by a recent demonstration of cyclic addition of quantized vorticity
into a Bose-Einstein condensate, the vortex pump, we study dynamical
instabilities and core sizes of giant vortices. The core size is found to
increase roughly as a square-root function of the quantum number of the vortex,
whereas the strengt... | physics |
6,796 | Second Josephson oscillations | cond-mat.quant-gas | As a model for mesoscopic quantum systems in thermal contact, we consider a
four-mode Bose-Hubbard model with two greatly differing tunneling rates. By a
series of Holstein-Primakoff transformations we show that the low-frequency
dynamics of this system consists in general of two slow Josephson oscillations,
rather tha... | physics |
6,797 | Detection of coherent superpositions of phase states by full counting statistics in a Bose Josephson junction | cond-mat.quant-gas | For a Bose Josephson junction realized with a double-well potential we
propose a strategy to observe the coherent superpositions of phase states
occurring during the time evolution after a sudden rise of the barrier
separating the two wells. We show that their phase content can be obtained by
the full-counting statisti... | physics |
6,798 | Parametric amplification of vacuum fluctuations in a spinor condensate | cond-mat.quant-gas | Parametric amplification of vacuum fluctuations is crucial in modern quantum
optics, enabling the creation of squeezing and entanglement. We demonstrate the
parametric amplification of vacuum fluctuations for matter waves using a spinor
F=2 Rb-87 condensate. Interatomic interactions lead to correlated pair creation
in ... | physics |
6,799 | Localization of a Bose-Einstein condensate in a bichromatic optical lattice | cond-mat.quant-gas | By direct numerical simulation of the time-dependent Gross-Pitaevskii
equation we study different aspects of the localization of a non-interacting
ideal Bose-Einstein condensate (BEC) in a one-dimensional bichromatic
quasi-periodic optical-lattice potential. Such a quasi-periodic potential, used
in a recent experiment ... | physics |
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