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
Topological supersolids with tunable chern numbers of a dipolar Fermi gas in a three-dimensional anisotropic optical latticeApr 19 2019Supersolids are among the most desirable unconventional many-body quantum states, which are linked to the fundamental issue of the coexistence of crystalline long-range order and off-diagonal long-range order (superfluidity). The recent experimental breakthrough ... More
Topological characterization of hierarchical fractional quantum Hall effects in topological flat bands with SU(N) symmetryApr 19 2019We study the many-body ground states of $N$-component interacting hardcore bosons loaded in topological lattice models with SU$(N)$-symmetric interactions based on exact diagonalization and density matrix renormalization group methods. For strong interactions, ... More
Bose polaron in spherical trap potentials: Spatial structure and quantum depletionApr 18 2019We investigate how the presence of a localized impurity in a Bose-Einstein condensate of trapped cold atoms that interact with each other weakly and repulsively affects the profile of the condensed and excited components at zero temperature. By solving ... More
Generalized Berry phase for a bosonic Bogoliubov system with exceptional pointsApr 18 2019We discuss the topology of Bogoliubov excitation bands from a Bose-Einstein condensate in an optical lattice. Since the Bogoliubov equation for a bosonic system is non-Hermitian, complex eigenvalues often appear and induce dynamical instability. As a ... More
Correlation functions of one-dimensional polar-molecules on optical latticesApr 18 2019We combine a slave-spin approach with a mean-field theory to develop an approximate theoretical scheme to study the charge (particle), spin, and, pairing correlation functions of fermionic polar molecules. We model the polar molecules subjected to a 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
Integrating Neural Networks with a Quantum Simulator for State ReconstructionApr 17 2019We demonstrate quantum many-body state reconstruction from experimental data generated by a programmable quantum simulator, by means of a neural network model incorporating known experimental errors. Specifically, we extract restricted Boltzmann machine ... More
Non-Hermitian skin effect and chiral damping in open quantum systemsApr 17 2019One of the unique features of non-Hermitian Hamiltonians is the non-Hermitian skin effect, namely that the eigenstates are exponentially localized at the boundary of system. For open quantum systems, short-time evolution can often be well described by ... 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
Precision spectroscopy of negative-ion resonances in Rydberg moleculesApr 17 2019The level structure of negative-ions near the electron detachment limit dictates the low-energy scattering of an electron with the parent neutral atom. We demonstrate that a single ultracold atom bound inside a Rydberg orbit forming an ultralong-range ... More
Controlling Dipolar Exchange Interactions in a Dense 3D Array of Large Spin FermionsApr 17 2019Dipolar interactions are ubiquitous in nature and rule the behavior of a broad range of systems spanning from energy transfer in biological systems to quantum magnetism. Here, we study magnetization-conserving dipolar induced spin-exchange dynamics in ... More
Acoustic Superradiance from a Bose-Einstein Condensate Vortex with a Self-Consistent Background Density ProfileApr 17 2019The 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 curved (1+1) dimensional Lorentzian space-time, governed ... More
Deep Learning-Assisted Classification of Site-Resolved Quantum Gas Microscope ImagesApr 17 2019We present a novel method for the analysis of quantum gas microscope images, which uses deep learning to improve the fidelity with which lattice sites can be classified as occupied or unoccupied. Our method is especially suited to addressing the case ... More
On superstatistics of energy for a free quantum Brownian particleApr 16 2019We consider energetics of a free quantum Brownian particle coupled to thermostat of temperature $T$ and study this problem in terms of the lately formulated quantum analogue of the energy equipartition theorem. We show how this quantum counterpart can ... 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
Engineering spin squeezing in a 3D optical lattice with interacting spin-orbit-coupled fermionsApr 16 2019One of the most important tasks in modern quantum science is to coherently control and entangle many-body systems, and to subsequently use these systems to realize powerful quantum technologies such as quantum-enhanced sensors. However, many-body entangled ... More
Quantum Statistical Enhancement of the Collective Performance of Multiple Bosonic EnginesApr 16 2019We consider an ensemble of indistinguishable quantum machines and show that quantum statistical effects can give rise to a genuine quantum enhancement of the collective thermodynamic performance. When multiple indistinguishable Bosonic work resources ... 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
Quantum partition of energy for a free Brownian particle: Impact of dissipationApr 16 2019We study the quantum counterpart of the theorem on energy equipartition for classical systems. We consider a free quantum Brownian particle modelled in terms of the Caldeira-Leggett framework: a system plus thermostat consisting of an infinite number ... 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
Non-degenerate Bound State Solitons in Multi-component Bose-Einstein CondensatesApr 16 2019We investigate non-degenerate bound state solitons systematically in multi-component Bose-Einstein condensates, through developing Darboux transformation method to derive exact soliton solutions analytically. In particular, we show that bright solitons ... 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
Exactly solvable model of two interacting Rydberg-dressed atoms confined in a two-dimensional harmonic trapApr 15 2019Exactly solvable model of two Rydberg-dressed atoms moving in a quasi-two-dimensional harmonic trap is introduced and its properties are investigated. Depending on the strength of inter-particle interactions and the critical range of the potential, the ... More
Ultra-Strong Light-Matter Coupling in Deeply Subwavelength THz LC resonatorsApr 14 2019The ultra-strong light-matter coupling regime has been demonstrated in a novel three-dimensional inductor-capacitor (LC) circuit resonator, embedding a semiconductor two-dimensional electron gas in the capacitive part. The fundamental resonance of the ... More
Topological Phase Transition driven by Infinitesimal Instability: Majorana Fermions in Non-Hermitian SpintronicsApr 12 2019Quantum phase transitions are intriguing and fundamental cooperative phenomena in physics. Analyzing a superconducting nanowire with spin-dependent non-Hermitian hopping, we discover a topological quantum phase transition driven by infinitesimal cascade ... More
A semiclassical field theory that is freed of the ultraviolet catastropheApr 12 2019A more accurate semiclassical theory for ultracold gases is derived, in which the occupation of high energy modes is dynamically constrained to the Bose-Einstein distribution. This regularized version of the SGPE model preserves the proper nonlinear energy ... More
Quench action and large deviations: work statistics in the one-dimensional Bose gasApr 12 2019We study the statistics of large deviations of the intensive work done in an interaction quench of a one-dimensional Bose gas with a large number N of particles, system size L and fixed density. We consider the case in which the system is initially prepared ... 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
Density Wave Superradiance of Photonic Fluid in Frustrated Triangle Lattice Cavity ArraysApr 11 2019The spontaneously broken of translational symmetry is usually due to the competition between local interactions and long-range interactions. However, in this paper, we show how a crystalline order can be generated by the competition between local interaction ... More
Rabi-resonant behavior of periodically-driven correlated fermion systemsApr 11 2019Fermi-Hubbard system with a periodically-modulated interaction has been recently shown to resonantly absorb energy at series of drive frequencies. In the present work, with the help of static perturbation theory we argue that driving couples to Hubbard ... More
Quench induced vortex-bright-soliton formation in binary Bose-Einstein condensatesApr 11 2019We unravel the spontaneous generation of vortex-bright-soliton structures in binary Bose-Einstein condensates confined in a two-dimensional harmonic trap where one of the two species has been segmented into two parts by a potential barrier. To trigger ... More
Generation of vortices and stabilization of vortex lattices in holographic superfluidsApr 11 2019Within the simplest holographic superfluid model and without any ingredients put by hand, it is shown that vortices can be generated when the angular velocity of rotating superfluids exceeds certain critical values, which can be precisely determined by ... More
Spin-exchange-induced exotic superfluids in a Bose-Fermi spinor mixtureApr 11 2019We consider a mixture of spin-1/2 bosons and fermions, where only the bosons are subjected to the spin-orbit coupling induced by Raman beams. The fermions, although not directly coupled to the Raman lasers, acquire an effective spin-orbit coupling through ... More
The Spinful Large Charge Sector of Non-Relativistic CFTs: From Phonons to Vortex CrystalsApr 10 2019We study operators in Schr\"odinger invariant field theories (non-relativistic conformal field theories or NRCFTs) with large charge (particle number) and spin. Via the state-operator correspondence for NRCFTs, such operators correspond to states of a ... More
Phases and phase transitions of Bose condensed light: phase separation effectApr 10 2019Recent realization of Bose-Einstein condensation of light in 2D provides a new platform for studying novel phases and phase transitions. The combination of low effective mass of the confined light and the presence of the dye molecules with randomly oriented ... More
A dual-species magneto-optical trap for lithium and strontium atomsApr 10 2019We present a machine built for experiments with ultracold mixtures of strontium and lithium atoms. The machine includes a science vacuum chamber and the relevant laser systems for cooling and trapping the atoms. With this machine, we realize a D2-line ... More
Generalized Independent Component Analysis for Extracting Eigen-Modes of a Quantum SystemApr 10 2019In many dynamical probes of a quantum system, quite often multiple eigenmodes are excited. Therefore, the experimental data can be quite messy due to the mixing of different modes, as well as the background noise, despite that each mode manifests itself ... More
Energy level dynamics across the many-body localization transitionApr 10 2019The level dynamics across the many body localization transition is examined for XXZ-spin model with a random magnetic field. We compare different scenaria of parameter dependent motion in the system and consider measures such as level velocities, curvatures ... More
Coupling between Rydberg states and Landau levels of electrons trapped on liquid heliumApr 10 2019We investigate the coupling between Rydberg states of electrons trapped on a liquid Helium surface and Landau levels induced by a perpendicular magnetic field. We show that this realises a prototype quantum system equivalent to an atom in a cavity, where ... More
Three two-component fermions with contact interactions: correct formulation and energy spectrumApr 09 2019Properties of two identical particles of mass $m$ and a distinct particle of mass $m_1$ in the universal low-energy limit of zero-range two-body interaction are studied in different sectors of total angular momentum $L$ and parity $P$. For the unambiguous ... 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
Derivation of the time-dependent Gross-Pitaevskii equation for the dipolar gasesApr 08 2019We derive the time-dependent dipolar Gross-Pitaevskii (GP) equation from the N-body Schr{\"o}dinger equation. More precisely we show a norm approximation for the solution of the many body equation as well as the convergence of its one-body reduced density ... More
Unveiling Emergent Crystal Orders of Incommensurate Dipolar Bosons in One-Dimensional Lattices using Full Distribution FunctionsApr 08 2019We explore the ground-states of a few dipolar bosons in optical lattices with incommensurate filling. The competition of kinetic, potential, and interaction energies leads to the emergence of a variety of crystal state orders with characteristic one- ... More
Bound states in a superfluid vortex: A detailed study along the BCS-BEC crossoverApr 08 2019The bound states that can occur in a superfluid vortex have recently called for attention owing to the capability of detecting them experimentally. However, a detailed theoretical account for the presence of these vortex bound states is still lacking, ... More
Fermion parity gap and topological degeneracy of one dimensional chain of fermions with spin-orbit coupling, Zeeman field, and intrinsic attractive interactionApr 07 2019We examine the topological properties of a one-dimensional (1D) chain of fermions with spin-orbit coupling, Zeeman field, and attractive Hubbard interaction by numerically computing the pair binding energy, excitation gap, and susceptibility to local ... 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
Hopf characterization of two-dimensional Floquet topological insulatorsApr 05 2019We present a topological characterization of time-periodically driven two-band models in $2+1$ dimensions as Hopf insulators. The intrinsic periodicity of the Floquet system with respect to both time and the underlying two-dimensional momentum space constitutes ... More
Chaos and the dynamics of information in dissipative electronic systemsApr 05 2019The dynamics of chaotic systems are, by definition, exponentially sensitive to initial conditions and may appear rather random. In this work, we explore relations between the chaotic dynamics of an observable and the dynamics of information (entropy) ... More
Microscopic characteristics and tomography scheme of the local Chern markerApr 05 2019The concept of the local Chern marker has gained a lot of attention especially in the field of ultracold quantum gases in optical lattices and artificial gauge fields. We investigate in further detail the microscopic real-space characteristics of the ... More
Many-Body Entanglement in Short-Range Interacting Fermi Gases for MetrologyApr 05 2019We explore many-body entanglement in spinful Fermi gases with short-range interactions, for metrology purposes. We characterize the emerging quantum phases via Density-Matrix Renormalization Group simulations and quantify their entanglement content for ... More
Transport in the sine-Gordon field theory: from generalized hydrodynamics to semiclassicsApr 04 2019The semiclassical approach introduced by Sachdev and collaborators proved to be extremely successful in the study of quantum quenches in massive field theories, both in homogeneous and inhomogeneous settings. While conceptually very simple, this method ... 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
Transverse instability and disintegration of domain wall of relative phase in coherently coupled two-component Bose-Einstein condensatesApr 04 2019Apr 10 2019We study transverse instability and disintegration dynamics of a domain wall of a relative phase in two-component Bose-Einstein condensates with a coherent Rabi coupling. We obtain analytically the stability phase diagram of the stationary solution of ... More
Transverse instability and disintegration of domain wall of relative phase in coherently coupled two-component Bose-Einstein condensatesApr 04 2019We study transverse instability and disintegration dynamics of a domain wall of a relative phase in two-component Bose-Einstein condensates with coherent Rabi coupling. We obtain analytically the phase diagram of the stationary solution of the domain ... More
QCD-like phase diagram with Efimov trimers and Cooper pairs in resonantly interacting SU(3) Fermi gasesApr 03 2019We investigate color superfluidity and trimer formation in resonantly interacting SU(3) Fermi gases with a finite interaction range. The finite range is crucial to avoid the Thomas collapse and treat the Efimov effect occurring in this system. Using the ... More
Nematic-orbit coupling and nematic density waves in spin-1 condensatesApr 02 2019We propose the creation of artificial nematic-orbit coupling in spin-1 Bose-Einstein condensates, in analogy to spin-orbit coupling. Using a suitably designed microwave chip the quadratic Zeeman shift, normally uniform in space, can be made to be spatially ... 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
Simultaneous Readout of Noncommuting Collective Spin Observables beyond the Standard Quantum LimitApr 02 2019We 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 original and auxiliary hyperfine manifold, ... More
Critical Behaviour and Fractality in Shallow One-Dimensional Quasi-Periodic PotentialsApr 02 2019Apr 03 2019Quasi-periodic systems offer an appealing intermediate between long-range ordered and genuine disordered systems, with unusual critical properties. One-dimensional models that break the so-called self-dual symmetry usually display a mobility edge, similarly ... More
Critical Behaviour and Fractality in Shallow One-Dimensional Quasi-Periodic PotentialsApr 02 2019Quasi-periodic systems offer an appealing intermediate between long-range ordered and genuine disordered systems, with unusual critical properties. One-dimensional models that break the so-called self-dual symmetry usually display a mobility edge, similarly ... More
$1/3$-Suppression of Magnonic Shot Noise in Diffusive Insulating MagnetsApr 02 2019Extending a Boltzmann-Langevin theory to magnons, we show a universality of current-noise suppression in diffusive systems against the difference of quantum-statistical properties of bosons and fermions. To this end, starting from a quantum kinetic equation ... More
Realization of a high power optical trapping setup free from thermal lensing effectsApr 01 2019Transmission of high power laser beams through partially absorbing materials modifies the light propagation via a thermally-induced effect known as thermal lensing. This may cause changes in the beam waist position and degrade the beam quality. Here we ... More
Anomalous relaxation and the high-temperature structure factor of XXZ spin chainsApr 01 2019We compute the spin structure factor of XXZ spin chains in the Heisenberg and gapped (Ising) regimes in the high-temperature limit for nonzero magnetization, within the framework of generalized hydrodynamics including diffusive corrections. The structure ... More
Dicke time crystals in driven-dissipative quantum many-body systemsApr 01 2019The Dicke model -- a paradigmatic example of superradiance in quantum optics -- describes an ensemble of atoms which are collectively coupled to a leaky cavity mode. As a result of the cooperative nature of these interactions, the system's dynamics are ... 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
Dynamical topological quantum phase transitions in nonintegrable modelsApr 01 2019We consider sudden quenches across quantum phase transitions in the $S=1$ XXZ model starting from the Haldane phase. We demonstrate that dynamical phase transitions may occur during these quenches that are identified by nonanalyticities in the rate function ... 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
Floquet engineering to exotic topological phases in cold-atom systemsMar 31 2019Topological phases with large topological numbers have been widely studied as an typical class of exotic states of matter with potentially important applications. Although several models have been shown to support states with large topological numbers, ... More
Topological polarons, quasiparticle invariants and their detection in 1D symmetry-protected phasesMar 30 2019In the presence of symmetries, one-dimensional quantum systems can exhibit topological order, which in many cases can be characterized by a quantized value of the many-body geometric Zak or Berry phase. We establish that this topological Zak phase is ... More
Negative-temperature quantum magnetism in open dissipative systemsMar 30 2019In quantum magnetism, virtual particle exchange mediates an interaction between individual spins. Here we show that an inelastic Hubbard interaction, which leads to a loss of particles, dramatically alters spin-exchange processes and drives a system into ... More
Pairing and molecule formation along the BEC-BCS crossover for finite range potentialsMar 30 2019We analyze the BCS-BEC crossover transition of a balanced two component mixture of fermions interacting via a finite range potential, within a mean field approach. For the analysis we consider three finite range potentials cases describing the interaction ... More
Black and gray solitons in holographic superfluids at zero temperatureMar 29 2019We construct gray soliton configurations, which move at constant speeds, in holographic superfluids for the first time. Since there should be no dissipation for a moving soliton to exist, we use the simplest holographic superfluid model at zero temperature, ... More
Glassy properties of the Bose-glass phase of a one-dimensional disordered Bose fluidMar 29 2019We study a one-dimensional disordered Bose fluid using bosonization, the replica method and a nonperturbative functional renormalization-group approach. We find that the Bose-glass phase is described by a fully attractive strong-disorder fixed point characterized ... More
Glassy properties of the Bose-glass phase of a one-dimensional disordered Bose fluidMar 29 2019Apr 18 2019We study a one-dimensional disordered Bose fluid using bosonization, the replica method and a nonperturbative functional renormalization-group approach. We find that the Bose-glass phase is described by a fully attractive strong-disorder fixed point characterized ... 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
Probing the many-body physics via measurement of the closed-channel fraction in a $^6$Li superfluidMar 29 2019Atomic Fermi gases provide an ideal platform for studying the pairing and superfluid physics, using a Feshbach resonance between closed channel molecular states and open channel scattering states. The closed-channel fraction $Z$ contains important many-body ... 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
Quantum Entanglement, Nonnegative Polynomials and Moment ProblemsMar 27 2019Although the quantum state of a many-body system (e.g, a system consisting of several atoms) is described in terms of its degrees of freedom, i.e., a large number of variables representing a point on the compact space of quantum states, there is usually ... More
Probing Nonlocal Spatial Correlations in Quantum Gases with Ultra-long-range Rydberg MoleculesMar 27 2019We present photo-excitation of ultra-long-range Rydberg molecules as a probe of spatial correlations in quantum gases. Rydberg molecules can be created with well-defined internuclear spacing, set by the radius of the outer lobe of the Rydberg electron ... 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
On the finite-size effects in two segregated Bose-Einstein condensates restricted by a hard wallMar 27 2019The finite-size effects in two segregated Bose-Einstein condensates (BECs) restricted by a hard wall is studied by means of the Gross-Pitaevskii equations in the double-parabola approximation (DPA). Starting from the consistency between the boundary conditions ... More
Stable multi-ring and rotating solitons in two-dimensional spin-orbit coupled Bose-Einstein condensates with a radially-periodic potentialMar 27 2019We consider two-dimensional spin-orbit coupled atomic Bose-Einstein condensate in a radially-periodic potential. The system supports different types of stable self-sustained states including radially-symmetric vorticity-carrying modes with different topological ... More
Order-from-quantum disorder effects and Zeeman field tuned quantum phase transitions in a bosonic quantum anomalous Hall systemMar 26 2019We study possible many body phenomena in the recent experimentally realized weakly interacting quantum anomalous Hall system of spinor bosons by Wu, et.al, Science 354, 83-88 (2016). At a zero Zeeman field $h=0$, by incorporating order from quantum disorder ... More
Non-cancellation of the parity anomaly in the strong-field regime of QED$_{2+1}$Mar 26 2019Quantum fluctuations lead to an anomalous violation of parity symmetry in quantum electrodynamics for an even number of spatial dimensions. While the leading parity-odd electric current vanishes in vacuum, we uncover a non-cancellation of the anomaly ... 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
Quantum dynamics of impenetrable SU(N) fermions in one-dimensional latticesMar 25 2019We study quantum quench dynamics in the Fermi-Hubbard model, and its SU(N) generalizations, in one-dimensional lattices in the limit of infinite onsite repulsion between all flavors. We consider families of initial states with generalized Neel order, ... More
Quantum Many-Body Scars and Space-Time Crystalline Order from Magnon CondensationMar 25 2019We study the eigenstate properties of a nonintegrable spin chain that was recently realized experimentally in a Rydberg-atom quantum simulator. In the experiment, long-lived coherent many-body oscillations were observed only when the system was initialized ... More
Quantum Many-Body Scars and Space-Time Crystalline Order from Magnon CondensationMar 25 2019Mar 27 2019We study the eigenstate properties of a nonintegrable spin chain that was recently realized experimentally in a Rydberg-atom quantum simulator. In the experiment, long-lived coherent many-body oscillations were observed only when the system was initialized ... More