Latest in cond-mat.quant-gas
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Non-equilibrium aspects of integrable modelsApr 19 2019Driven by breakthroughs in experimental and theoretical techniques, the study of non-equilibrium quantum physics is a rapidly expanding field with many exciting new developments. Amongst the manifold ways the topic can be investigated, one dimensional ... More Nonlocal interactions in collapsing condensates in a boxApr 17 2019The collapse of attractive Bose-Einstein condensates in a box with tunable interatomic interactions was studied experimentally recently. Not only were remarkably stable remnant condensates observed, but furthermore they often seem to involve two stable ... More Spatial Phase Separation of a Binary Mixture in a Ring TrimerApr 17 2019We investigate the phase separation mechanism of bosonic binary mixtures in spatially-fragmented traps, evidencing the emergence of phases featuring a different degree of mixing. The analysis is initially carried out by means of a semiclassical approach ... More Dynamical spin-orbit coupling of a quantum gasApr 17 2019We realize the dynamical 1D spin-orbit-coupling (SOC) of a Bose-Einstein condensate confined within an optical cavity. The SOC emerges through spin-correlated momentum impulses delivered to the atoms via Raman transitions. These are effected by classical ... More Nonlinear Dynamics of the Cold Atom Analog False VacuumApr 16 2019We investigate the nonlinear dynamics of cold atom systems that can in principle serve as quantum simulators of false vacuum decay. The analog false vacuum manifests as a metastable vacuum state for the relative phase in a two-species Bose-Einstein condensate ... More Dipolar Bose gas with three-body interactions in weak disorderApr 16 2019We study effects of weak disorder with Gaussian correlation function on a dipolar Bose gas with three-body interactions using the Hartree-Fock-Bogoliubov theory. Corrections due to quantum, thermal and disorder fluctuations to the condensate depletion, ... More Partition of energy for a dissipative quantum oscillatorApr 16 2019We reveal a new face of the old clich\'ed system: a dissipative quantum harmonic oscillator. We formulate and study a quantum counterpart of the energy equipartition theorem satisfied for classical systems.Both mean kinetic energy $E_k$ and mean potential ... More Non-Hermitian Majorana Modes Protect Degenerate Steady StatesApr 16 2019Majorana zero modes (MZMs) ensure robust spectral degeneracies in topological phases of superconductors. We demonstrate that non-Hermitian generalizations of MZMs are responsible for a degeneracy in the complex spectrum which describes dynamics of a continuously-observed ... More Nonlinear dynamics of coupled superfluidsApr 15 2019Following recent experiments on ultracold dual superflows, we model in this work the dynamics of two harmonically trapped counterflowing superfluids. Using complementary analytical and numerical approaches, we study the shedding of elementary excitations ... More The energy of dilute Bose gasesApr 12 2019For a dilute system of non-relativistic bosons interacting through a positive $L^1$ potential $v$ with scattering length $a$ we prove that the ground state energy density satisfies the bound $e(\rho) \geq 4\pi a \rho^2 (1+ \frac{128}{15\sqrt{\pi}} \sqrt{\rho ... More Flying in a superfluid: starting flow past an airfoilApr 09 2019We investigate the development of superfluid flow around an airfoil accelerated to a finite velocity from rest. Using both simulations of the Gross-Pitaevskii equation and analytical calculations we find striking similarities to viscous flows: from the ... More Superfluids, Fluctuations and DisorderApr 08 2019We present a field-theory description of ultracold bosonic atoms in presence of a disordered external potential. By means of functional integration techniques, we aim to investigate and review the interplay between disordered energy landscapes and fluctuations, ... More Flat-band many-body localization in the Creutz ladderApr 06 2019Apr 15 2019Study on a disorder-free many-body localization is reported for the flat-band Creutz ladder, which was recently realized in cold-atoms in an optical lattice. In a non-interacting case, the flat-band structure leads to a Wannier wavefunction localized ... More Flat-band many-body localization in the Creutz ladderApr 06 2019Study on disorder-free many-body localization is reported for the flat-band Creutz ladder, which was recently realized in cold-atoms in an optical lattice. In non-interacting case, the flat-band structure leads to a Wannier wave function localized on ... More Bose polarons near quantum criticalityApr 04 2019The emergence of quasiparticles in strongly interacting matter represents one of the cornerstones of modern physics. However, when different phases of matter compete near a quantum critical point, the very existence of quasiparticles comes under question. ... More Bose polarons near quantum criticalityApr 04 2019Apr 10 2019The emergence of quasiparticles in strongly interacting matter represents one of the cornerstones of modern physics. However, when different phases of matter compete near a quantum critical point, the very existence of quasiparticles comes under question. ... More Four-dimensional reflection groups and electrostaticsApr 04 2019We start from the observation that the two-element cyclic group consisting of the identity and a sphere inversion can be viewed as a stereographic image of a one-mirror reflection group in 4D. This allows us to identify 19 three-parametric families of ... More The Fractal X-Ray Edge ProblemApr 02 2019We study the Anderson orthogonality catastrophe, and the corresponding X-ray edge problem, in systems that are at a localization transition driven by a deterministic quasiperiodic potential. Specifically, we address how the ground state of the Aubry-Andre ... More Pair formation in quenched unitary Bose gasesApr 01 2019We study a degenerate Bose gas quenched to unitarity by solving a many-body model including three-body losses and correlations up to second order. As the gas evolves in this strongly-interacting regime, the buildup of correlations leads to the formation ... More Are ultracold molecular collisions sticky?Apr 01 2019Understanding and controlling collisions is crucial to the burgeoning field of ultracold molecules. All experiments so far have observed fast loss of molecules from the trap. However, the dominant mechanism for collisional loss is not well understood ... More Hamiltonian Hysteresis and ChaosMar 31 2019We propose currently feasible experiments using small, isolated systems of ultracold atoms to investigate the effects of dynamical chaos in the microscopic onset of irreversibility. A control parameter is tuned past a critical value, then back to its ... More Superfluid Vortex Dynamics on Planar Sectors and ConesMar 31 2019We study the dynamics of vortices formed in a superfluid film adsorbed on the curved two-dimensional surface of a cone. To this aim, we observe that a cone can be unrolled to a sector on a plane with periodic boundary conditions on the straight sides. ... More Formation of nonlinear X-waves in condensed matter systemsMar 29 2019X-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 ... More Quantum turbulence in quantum gasesMar 28 2019Turbulence is characterized by a large number of degrees of freedom, distributed over several length scales, that result into a disordered state of a fluid. The field of quantum turbulence deals with the manifestation of turbulence in quantum fluids, ... More One-dimensional mixtures of several ultracold atoms: a reviewMar 28 2019Recent theoretical and experimental progress on studying one-dimensional systems of bosonic, fermionic, and bose-fermi mixtures of a few ultracold atoms confined in traps is reviewed in the broad context of mesoscopic quantum physics. We pay special attention ... More Controlling excitation avalanches in driven Rydberg gasesMar 28 2019Recent experiments with strongly interacting, driven Rydberg ensembles have introduced a promising setup for the study of self-organized criticality (SOC) in cold atom systems. Based on this setup, we theoretically propose a control mechanism for the ... More Engineering momentum profiles of cold-atom beamsMar 27 2019We describe a procedure for engineering beams of cold atoms by selectively filtering particles from a trapped gas based on momenta. A gas is spatially connected to an external potential whose transmission coefficient only allows atoms with desired momenta ... More Asymmetric quantum shot noise in magnon transportMar 26 2019We study a frequency-dependent noise-to-current ratio for asymmetric, symmetric, and noncommutative current-noise in a ferromagnetic insulating junction, and extract quantum-mechanical properties of magnon transport at low temperatures. We demonstrate ... More State transfer in an inhomogeneous spin chainMar 25 2019We present an analytical study of state transfer in a spin chain in the presence of an inhomogeneous set of exchange coefficients. We initially consider the homogeneous case and describe a method to obtain the energy spectrum of the system. Under certain ... More