Latest in cond-mat.quant-gas

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Contact and sum-rules in a near-uniform Fermi gas at unitarityFeb 21 2019We present an experimental study of the high-energy excitation spectra of unitary Fermi gases. Using focussed beam Bragg spectroscopy, we locally probe atoms in the central region of a harmonically trapped cloud where the density is nearly uniform, enabling ... More
Optical valley Hall effect for highly valley-coherent exciton-polaritons in an atomically thin semiconductorFeb 20 2019Spin-orbit coupling is a fundamental mechanism that connects the spin of a charge carrier with its momentum. Likewise, in the optical domain, a synthetic spin-orbit coupling is accessible, for instance, by engineering optical anisotropies in photonic ... More
A functional renormalization group approach to thermodynamics of weakly interacting Bose gases: from linear to hydrodynamic fluctuationsFeb 19 2019We study weakly interacting Bose gases using the functional renormalization group with a hydrodynamic effective action. We use a scale-dependent parametrization of the boson fields developed previously that interpolates between a Cartesian representation ... More
Evaporative cooling and self-thermalization in an open system of interacting fermionsFeb 19 2019We study depletion dynamics of an open system of weakly interacting fermions with two-body random interactions. In this model fermions are escaping from the high-energy one-particle orbitals, that mimics the evaporation process used in laboratory experiments ... More
Experimental realization of a non-magnetic one-way spin switchFeb 17 2019Controlling 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 ... More
Solitons in inhomogeneous gauge potentials: integrable and nonintegrable dynamicsFeb 16 2019We introduce an exactly integrable nonlinear model describing the dynamics of spinor solitons in space-dependent matrix gauge potentials of rather general types. The model is shown to be gauge equivalent to the integrable system of vector nonlinear Schr\"odinger ... More
Mean-field phase diagram of ultracold atomic gases in cavity quantum electrodynamicsFeb 15 2019We investigate the mean-field phase diagram of the Bose-Hubbard model with infinite-range interactions in two dimensions. This model describes ultracold bosonic atoms confined by a two-dimensional optical lattice and dispersively coupled to a cavity mode ... More
Collective oscillation modes of a superfluid Bose-Fermi mixtureFeb 15 2019In this work, we present a theoretical study for the transverse and monopole modes of a mixture of Bose and Fermi superfluids in the crossover from a Bardeen-Cooper-Schrieffer (BCS) superfluid to a Bose-Einstein condensate (BEC) of molecules in harmonic ... More
Local spin manipulation of quantized atomic currentsFeb 14 2019Spin is a fundamental quantum property of matter, and lifting its degeneracy lies at the heart of subtle transport phenomena and future schemes for quantum information processing. Here, we implement a microscopic spin filter for cold fermionic atoms in ... More
Approximate self-energy for Fermi systems with large s-wave scattering length: a step towards density functional theoryFeb 14 2019In the present work, we start from a minimal Hamiltonian for Fermi systems where the s-wave scattering is the only low energy constant at play. Many-Body Perturbative approach that is usually valid at rather low density is first discussed. We then use ... More
Topologically protected quantization of workFeb 14 2019The transport of a particle in the presence of a potential that changes periodically in space and in time can be characterized by the amount of work needed to shift a particle by a single spatial period of the potential. In general, this amount of work, ... More
Symmetry Imbalance in a Shaking Triangular Optical LatticeFeb 13 2019Lots of interesting phenomena can be investigated under symmetry imbalance condition, such as symmetry protected topological orders, simulation of frustrated quantum anti-ferromagnetism and so on. In this work, we demonstrated a simple but effective method ... More
Interacting non-Hermitian ultracold bosonic systems in three-dimensional harmonic trap: two-body exact solutions and high-order exceptional pointsFeb 13 2019We study interacting ultracold atoms in a three-dimensional (3D) harmonic trap with spin-selective dissipations, which can be effectively described by non-Hermitian parity-time ($\mathcal{PT}$) symmetric Hamiltonians. By solving the non-Hermitian two-body ... More
Tuning Dissipation and Excitations in Superfluid Fermi Gases with a Moving ImpurityFeb 13 2019We develop a method to extract the dissipation for a heavy moving impurity immersed in superfluid Fermi gases. The drag force is derived analytically. As a reward, we are able to extract the dynamical structure factor, from which density excitations of ... More
Collisional dynamics of multiple dark solitons in a toroidal Bose-Einstein condensate: Quasiparticle pictureFeb 12 2019We study the collisional dynamics of multiple dark solitons in a Bose-Einstein condensate confined by a toroidal trap. We assume a tight enough confinement in the radial direction to prevent possible dissipative effects due to the presence of solitonic ... More
Dynamic properties of superconductors: Anderson-Bogoliubov mode and Berry phase in BCS and BEC regimesFeb 12 2019We analyze the evolution of the dynamics of a neutral s-wave superconductor between BCS and BEC regimes. We consider 2d case, when BCS-BEC crossover occurs already at weak coupling as a function of the ratio of the two scales -- the Fermi energy $E_F$ ... More
Collective modes for quantum spin Hall insulator interacting with quantum lightFeb 12 2019We investigate the light-matter interaction between the edge state of a 2D topological insulator and quantum electromagnetic field. The interaction originates from the Zeeman term between the spin of the edge electrons and the magnetic field, and also ... More
Mixture of two unequally charged superfluids in a magnetic fieldFeb 12 2019The artificial magnetic fields engineered for ultra cold gases depend on the internal structure of the neutral atoms. Therefore the components of a mixture composed of two atomic gases can exhibit a different response to an artificial magnetic field. ... More
Comparison of three approaches to light scattering by dilute cold atomic ensemblesFeb 12 2019Collective effects in atom-light interaction is of great importance for cold-atom-based quantum devices or fundamental studies on light transport in complex media. Here we discuss and compare three different approaches to light scattering by dilute cold ... More
Dynamics of trapped one-dimensional bosons for intermediate repulsive interactionsFeb 11 2019Feb 14 2019The time-evolution of few number of interacting, harmonically confined one-dimensional bosons is numerically obtained for arbitrary two-body $\delta-$potential interaction strengths. Through evaluation of the structure factor, the dependence of Bragg-scattering ... More
Dynamics of trapped one-dimensional bosons for intermediate repulsive interactionsFeb 11 2019The time-evolution of few number of interacting, harmonically confined one-dimensional bosons is numerically obtained for arbitrary two-body $\delta-$potential interaction strengths. Through evaluation of the structure factor, the dependence of Bragg-scattering ... More
Scrambling and Complexity in Phase SpaceFeb 11 2019The study of information scrambling in many-body systems has sharpened our understanding of quantum chaos, complexity and gravity. Here, we extend the framework for exploring information scrambling to infinite dimensional continuous variable (CV) systems. ... More
Scaling laws for harmonically trapped two-species mixtures at thermal equilibriumFeb 11 2019We discuss the scaling of the interaction energy with particle numbers for a harmonically trapped two-species mixture at thermal equilibrium experiencing interactions of arbitrary strength and range. In the limit of long-range interactions and weak coupling, ... More
Ground State Cooling and Transport of Single Atoms for Ultracold Molecular AssemblyFeb 11 2019We demonstrate full quantum state control of two species of single atoms using optical tweezers. Our demonstration includes 3D ground-state cooling of a single atom (Cs) in an optical tweezer, transport by several microns with minimal heating, and merge ... More
Cesium bright matter-wave solitons and soliton trainsFeb 08 2019A setup for studying bright matter-wave solitons of a cesium Bose-Einstein condensate (BEC) is presented. Production of a single soliton is demonstrated and dependence of soliton atom number on the interatomic interaction is studied. Formation of soliton ... More
Momentum correlations between two ultra-cold bosons escaping from an open wellFeb 08 2019The dynamical properties of a one-dimensional system of two bosons escaping from an open potential well are studied in terms of the momentum distributions of particles. It is shown that the single- and two-particle momentum distributions undergo a specific ... More
Dipolar excitons offer a rich playground for both design of novel optoelectronic devices and fundamental many-body physicsFeb 08 2019Dipolar excitons offer a rich playground for both design of novel optoelectronic devices and fundamental many-body physics. Wide GaN/(AlGa)N quantum wells host a new and promising realization of dipolar excitons. We demonstrate the in-plane confinement ... More
Vorticity and quantum turbulence in the merging of superfluid Helium nanodropletsFeb 07 2019We have studied the merging of two $^4$He droplets at zero temperature, caused by their Van der Waals mutual attraction. During the early stages of the merging, density structures appear which closely match the experimental observations by Vicente et ... More
Les Houches Lectures on Effective Field Theories for Nuclear and (some) Atomic PhysicsFeb 07 2019These lectures are a pedagogical -- not comprehensive -- introduction to the applications of effective field theory in the context of nuclear and atomic physics. A common feature of these applications is the interplay between nonperturbative physics (needed ... More
The variational reduction for low-dimensional Fermi gases and Bose - Fermi mixtures: A brief reviewFeb 07 2019We present a summary of some recent theoretical results for matter-wave patterns in Fermi and Bose-Fermi degenerate gases, obtained in the framework of the quasi-mean-field approximation. We perform a dimensional reduction from the three-dimensional (3D) ... More
Coherent vortex dynamics in a strongly-interacting superfluid on a silicon chipFeb 07 2019Two-dimensional superfluidity and quantum turbulence are directly connected to the microscopic dynamics of quantized vortices. However, surface effects have prevented direct observations of coherent vortex dynamics in strongly-interacting two-dimensional ... More
Nonequilibrium dynamics of noninteracting fermions in a trapFeb 07 2019We consider the real time dynamics of $N$ noninteracting fermions in $d=1$. They evolve in a trapping potential $V(x)$, starting from the equilibrium state in a potential $V_0(x)$. We study the time evolution of the Wigner function $W(x,p,t)$ in the phase ... More
Condensation and superfluidity of $SU(N)$ Bose gasFeb 06 2019We perform the comprehensive study of the condensate and superfluid densities for the $N$-component three-dimensional Bose gas with the symmetric inter- and intraspecies short-range interaction between particles. In particular, based on the large-$N$ ... More
Heating in Nanophotonic Traps for Cold AtomsFeb 06 2019Laser-cooled atoms that are trapped and optically interfaced with light in nanophotonic waveguides provide a powerful platform for quantum optics research. A long-standing challenge for such systems is heating of the atomic motion with rates exceeding ... More
Modeling atom-atom interactions at low energy by Jost-Kohn potentialsFeb 06 2019It is well-known that the zero-range contact potential approximation for the mean-field interaction of a many-atom system breaks down when the atoms interact through a scattering resonance. At present, there exists no standard model interaction potential ... More
Modeling atom-atom interactions at low energy by Jost-Kohn potentialsFeb 06 2019Feb 08 2019It is well-known that the zero-range contact potential approximation for the mean-field interaction of a many-atom system breaks down when the atoms interact through a scattering resonance. At present, there exists no standard model interaction potential ... More
Graded-index optical fiber emulator of an interacting three-atom system: Classical non-separability and illumination control of particle statisticsFeb 05 2019We show that optical fibers with a graded-index profile and thin metallic slabs can be used to emulate a system of three ultracold strongly interacting atoms. We study the symmetries present in the eigenstates by using discrete group theory, always comparing ... More
Three-body repulsive forces among identical bosons in one dimensionFeb 05 2019I consider non-relativistic bosons interacting via pairwise potentials with infinite scattering length and supporting no two-body bound states. To lowest order in effective field theory, these conditions lead to non-interacting bosons, since the coupling ... More
Bloch oscillations of spin-orbit-coupled cold atoms in an optical lattice and spin current generationFeb 02 2019We study the Bloch oscillation dynamics of a spin-orbit-coupled cold atomic gas trapped inside a one-dimensioanl optical lattice. The eigenspectra of the system is identified as two interpenetrating Wannier-Stark ladder. Based on that, we carefully analyzed ... More
Zero-temperature equation of state of a two-dimensional bosonic quantum fluid with finite-range interactionFeb 02 2019Feb 13 2019We derive the two-dimensional equation of state for a bosonic system of ultracold atoms interacting with a finite-range effective interaction. Within a functional integration approach, we employ an hydrodynamic parametrization of the bosonic field to ... More
Critical Opalescence across the Doping Driven Mott Transition in Optical Lattices of Ultracold AtomsFeb 01 2019Phase transitions and their associated crossovers are imprinted in the behavior of fluctuations. Motivated by recent experiments on ultracold atoms in optical lattices, we compute the thermodynamic density fluctuations $\delta N^2$ of the two-dimensional ... More
An Optical Tweezer Array of Ultracold MoleculesFeb 01 2019Arrays of single ultracold molecules promise to be a powerful platform for many applications ranging from quantum simulation to precision measurement. Here we report on the creation of an optical tweezer array of single ultracold CaF molecules. By utilizing ... More
Defect-free assembly of 2D clusters of more than 100 single-atom quantum systemsFeb 01 2019Feb 05 2019We demonstrate the defect-free assembly of versatile target patterns of up 111 neutral atoms, building on a 361-site subset of a micro-optical architecture that readily provides thousands of sites for single-atom quantum systems. By performing up to 80 ... More
Localization as an entanglement phase transition in boundary-driven Anderson modelsJan 31 2019The Anderson localization transition is one of the most well studied examples of a zero temperature quantum phase transition. On the other hand, many open questions remain about the phenomenology of disordered systems driven far out of equilibrium. Here ... More
Enhanced critical temperature, pairing fluctuation effects, and BCS-BEC crossover in a two-band Fermi gasJan 31 2019Feb 14 2019We study the superfluid critical temperature in a two-band attractive Fermi system with strong pairing fluctuations associated with both interband and intraband couplings. We focus specifically on a configuration where the intraband coupling is varied ... More
The mixing-demixing phase diagram of ultracold heteronuclear mixtures in a ring trimerJan 31 2019We derive the complete mixing-demixing phase-diagram relevant to a bosonic binary mixture confined in a ring trimer and modeled within the Bose-Hubbard picture. The mixing properties of the two quantum fluids, which are shown to be strongly affected by ... More
Universal Short Range Correlations in Bosonic Helium ClustersJan 31 2019Short range correlations in bosonic Helium clusters, composed of $^4$He atoms, are studied utilizing the generalized contact formalism. The emergence of universal $n$-body short range correlations is formulated and demonstrated numerically via Monte Carlo ... More
Interactions of solitons with positive and negative masses: Shuttle motion and co-accelerationJan 31 2019We consider a possibility to realize self-accelerating motion of interacting states with effective positive and negative masses in the form of pairs of solitons in two-component BEC loaded in an optical-lattice (OL) potential. A crucial role is played ... More
Two-body and three-body contacts for three bosons in the unitary regime: Analytic expressions and limiting formsJan 30 2019The two and three-body contacts are central to a set of univeral relations between microscopic few-body physics within an ultracold Bose gas and its thermodynamical properties. They may also be defined in trapped few-particle systems, which is the subject ... More
Condensates in annuli: Dimensionality of the varianceJan 30 2019Static and dynamic properties of Bose-Einstein condensates in annular traps are investigated by solving the many-boson Schr\"odinger equation numerically accurately using the multiconfigurational time-dependent Hartree for bosons method. We concentrate ... More
Stark spectroscopy of Rydberg atoms in an atom-ion hybrid trapJan 30 2019We report on Rydberg spectroscopy of ultracold atoms in an atom-ion hybrid trap for probing the electric fields in a mixture of atoms and ions. We obtain spectra which exhibit excitation gaps corresponding to avoided level crossings in the Stark map. ... More
Diagnosing Potts criticality and two-stage melting in one-dimensional hard-boson modelsJan 30 2019We investigate a model of hard-core bosons with infinitely repulsive nearest- and next-nearest-neighbor interactions in one dimension, introduced by Fendley, Sengupta and Sachdev in Phys. Rev. B 69, 075106 (2004). Using a combination of exact diagonalization, ... More
Vortex patterns in the almost-bosonic anyon gasJan 30 2019We study theoretically and numerically the ground state of a gas of 2D anyons in an external trapping potential. We treat anyon statistics in the magnetic gauge picture, perturbatively around the bosonic end. This leads to a mean-field energy functional, ... More
Bunching, clustering, and the buildup of few-body correlations in a quenched unitary Bose gasJan 29 2019Jan 30 2019We study the growth of two- and three-body correlations in an ultracold Bose gas quenched to unitarity. This is encoded in the dynamics of the two- and three-body contacts analyzed in this work. Via a set of relations connecting many-body correlations ... More
Magnetic Monopole NoiseJan 29 2019Magnetic monopoles are hypothetical elementary particles exhibiting quantized magnetic charge $m_0=\pm(h/\mu_0e)$ and quantized magnetic flux $\Phi_0=\pm h/e$. A classic proposal for detecting such magnetic charges is to measure the quantized jump in ... More
Disorderless quasi-localization of polar gases in one-dimensional latticesJan 28 2019One-dimensional polar gases in deep optical lattices present a severely constrained dynamics due to the interplay between dipolar interactions, energy conservation, and finite bandwidth. The appearance of dynamically-bound nearest-neighbor dimers enhances ... More
Thermoelectricity of cold ions in optical latticesJan 28 2019We study analytically and numerically the thermoelectric properties of cold ions placed in an optical lattice. Our results show that the transition from sliding to pinned phase takes place at a certain critical amplitude of lattice potential being similar ... More
Angular momentum fractionalization: the quantum advantage of entangled bosonsJan 27 2019Quantum mechanics is characterized by quantum coherence and entanglement. After having discovered how these fundamental concepts govern the physical reality, scientists have been devoting intense efforts to harness them to shape the future science and ... More
Observation of coherent multi-orbital polarons in a two-dimensional Fermi gasJan 25 2019We report on the experimental observation of multi-orbital polarons in a two-dimensional Fermi gas of ${}^{173}\mathrm{Yb}$ atoms formed by mobile impurities in the metastable ${}^3\mathrm{P}_0$ orbital and a Fermi sea in the ground-state orbital. We ... More
Observation of spin-structure of ultralong-range Rydberg moleculesJan 25 2019We present an experimental and theoretical study of spin coupling effects in a complex Rydberg molecular energy level structure. Specifically, we explore $^{87}$Rb$_2$ bound states below the $16P_{3/2}+5S_{1/2}$ dissociation threshold. The given complexity ... More
Compact bulk-machined electromagnets for quantum gas experimentsJan 25 2019We present an electromagnet combining a large number of windings in a constrained volume with efficient cooling. It is based on bulk copper where a small pitch spiral is cut out and impregnated with epoxy, forming an ensemble which is then machined at ... More
Controlling cold atom-ion collisions using a Rydberg stateJan 25 2019We present a method to control the cold collision between an ultracold atom and a trapped ion. A laser is used to excite the ground state atom to a repulsive Rydberg potential level at a certain atom-ion distance. In this way the ion is effectively surrounded ... More
Realizing Hopf Insulators in Dipolar Spin SystemsJan 24 2019The Hopf insulator represents a topological state of matter that exists outside the conventional ten-fold way classification of topological insulators. Its topology is protected by a linking number invariant, which arises from the unique topology of knots ... More
Bosons condensed in two modes with flavour-changing interactionJan 24 2019A quantum model is considered for $N$ bosons condensed in two orthogonal single-particle modes with tunable energy separation in the presence of flavour-changing contact interaction, which can be readily solved by direct diagonalization. Despite its elementary ... More
Exponentially long lifetime of universal quasi-steady states in topological Floquet pumpsJan 24 2019Topological phenomena in periodically driven, isolated quantum many body systems are difficult to obtain due to the generic tendency of such systems to heat up towards a maximum entropy state in the long time limit. Here we investigate a mechanism to ... More
A Quantum Model of Feshbach ResonancesJan 24 2019We consider a quantum model of two-channel scattering to describe the mechanism of a Feshbach resonance. We perform a rigorous analysis in order to count and localize the energy resonances in the perturbative regime, i.e., for small inter-channel coupling, ... More
Thermal conductivity of the degenerate one-dimensional Fermi gasJan 23 2019We study heat transport in a gas of one-dimensional fermions in the presence of a small temperature gradient. At temperatures well below the Fermi energy there are two types of relaxation processes in this system, with dramatically different relaxation ... More
Conformal field theory on top of a breathing one-dimensional gas of hard core bosonsJan 23 2019The recent results of [J. Dubail, J.-M. St\'ephan, J. Viti, P. Calabrese, Scipost Phys. 2, 002 (2017)], which aim at providing access to large scale correlation functions of inhomogeneous critical one-dimensional quantum systems -- e.g. a gas of hard ... More
Transient supersolid properties in an array of dipolar quantum dropletsJan 23 2019We study theoretically and experimentally the emergence of supersolid properties in a dipolar Bose-Einstein condensate. The theory reveals a ground state phase diagram with three distinct regimes - a regular Bose-Einstein condensate, incoherent and coherent ... More
Sub-nanometer optical linewidth of thulium atoms in rare gas crystalsJan 22 2019We investigate the 1140 nm magnetic dipole transition of thulium atoms trapped in solid argon and neon. These solids can be straightforwardly grown on any substrate at cryogenic temperatures, making them prime targets for surface sensing applications. ... More
Dynamical Phase Transitions in the Quantum Dimer Model on a Square LatticeJan 22 2019We consider the quench dynamics of a two-dimensional (2D) constrained quantum dimer model and determine its rich dynamical phase diagram. By means of exact diagonalization on systems of sizes up to $8\times8$, we show that order parameters generically ... More
Floquet approach to $\mathbb{Z}_{2}$ lattice gauge theories with ultracold atoms in optical latticesJan 21 2019Quantum simulation has the potential to investigate gauge theories in strongly-interacting regimes, which are up to now inaccessible through conventional numerical techniques. Here, we take a first step in this direction by implementing a Floquet-based ... More
Dynamical Fractal in Quantum Gases with Discrete Scaling SymmetryJan 21 2019Inspired by the similarity between the fractal Weierstrass function and quantum systems with discrete scaling symmetry, we establish general conditions under which the dynamics of a quantum system will exhibit fractal structure in the time domain. As ... More
Many-body delocalization dynamics in long Aubry-André quasiperiodic chainsJan 21 2019We theoretically study quench dynamics in an interacting one-dimensional spin chain with a quasi-periodic on-site field, also known as the interacting Aubry-Andr\'e model of many-body localization. Using the time-dependent variational principle we assess ... More
Higher Order Quantum Ghost Imaging with Ultra-Cold AtomsJan 21 2019Ghost imaging is a quantum optics technique that uses correlations between two beams to reconstruct an image in one beam from photons that do not interact with the object being imaged. While pairwise (second order) correlations are usually used to create ... More
Symmetry breaking of quantum droplets in a dual-core trapJan 20 2019We consider the dynamical model of a binary bosonic gas trapped in a symmetric dual-core cigar-shaped potential. The setting is modeled by a system of linearly-coupled one-dimensional Gross-Pitaevskii equations with the cubic self-repulsive terms and ... More
Tunneling of persistent currents in coupled ring-shaped Bose-Einstein condensatesJan 19 2019Considerable progress in experimental studies of atomic gases in a toroidal geometry has opened up novel prospects for the investigation of fundamental properties of superfluid states and creation of new configurations for atomtronic circuits. In particular, ... More
Sensing magnetic fields with non-gaussian quantum fluctuationsJan 18 2019The precision of a quantum sensor can overcome its classical counterpart when its constituants are entangled. In gaussian squeezed states, quantum correlations lead to a reduction of the quantum projection noise below the shot noise limit. However, the ... More
Using nonequilibrium thermodynamics to optimize the cooling of a dilute atomic gasJan 18 2019Optimizing thermodynamic processes far from equilibrium is a challenge. We report the experimental optimization of cooling and thermalization of a gas of few noninteracting Cesium atoms confined in a nonharmonic optical dipole trap. To this end, we combine ... More
Axion production in unstable magnetized plasmas: an active source of dark-matterJan 17 2019Axions, the hypothetical particles restoring the charge-parity symmetry in the strong sector of the Standard Model, and one of the most prone candidates for dark matter, are well-known to interact with plasmas. In a recent publication [Phys. Rev. Lett. ... More
Magnon Condensation in a Dense Nitrogen-Vacancy Spin EnsembleJan 17 2019The feasibility of creating a Bose-Einstein condensate of magnons using a dense ensemble of nitrogen-vacancy spin defects in diamond is investigated. Through assessing a density-dependent spin exchange interaction strength and the magnetic phase transition ... More
Gapless Kitaev Spin Liquid to Classical String Gas through Tensor NetworksJan 17 2019Jan 31 2019We provide a framework for understanding the gapless Kitaev spin liquid (KSL) in the language of tensor network(TN). Without introducing Majorana fermion, most of the features of the KSL including the symmetries, gauge structure, criticality and vortex-freeness ... More
2D Quantum Turbulence in Polariton CondensatesJan 17 2019The coexistence of the energy and enstrophy cascades in 2D quantum turbulence is one of the important open questions in the studies of quantum fluids. Here, we show that polariton condensates are particularly suitable for the possible observation of scaling ... More
Superfluid stiffness for the attractive Hubbard model on a honeycomb optical latticeJan 17 2019In addition to the conventional contribution that is directly controlled by the single-particle energy spectrum, the superfluid phase stiffness of a two-component Fermi gas has a geometric contribution that is governed by the quantum metric of the honeycomb's ... More
Natural Oscillations of a Polariton Condensate in a RingJan 17 2019We have observed oscillations of a polariton condensate in a quasi-one-dimensional ring geometry that correspond to the natural frequency of a rigid pendulum. By comparing the oscillations in energy and density, we conclude that excitons have also traveled ... More
Magnetic field induced splitting and polarization of monolayer-based valley exciton-polaritonsJan 16 2019Atomically thin crystals of transition metal dichalcogenides are ideally suited to study the interplay of light-matter coupling, polarization and magnetic field effects. In this work, we investiagte the formation of exciton-polaritons in a MoSe2 monolayer, ... More
Modelling of vorticity, sound and their interaction in two-dimensional superfluidsJan 16 2019Vorticity in two-dimensional superfluids is subject to intense research efforts due to its role in quantum turbulence, dissipation and the BKT phase transition. Interaction of sound and vortices is of broad importance in Bose-Einstein condensates and ... More
Thermalization with detailed-balanced two-site Lindblad dissipatorsJan 16 2019The use of two-site Lindblad dissipator to generate thermal states and study heat transport raised to prominence since [J. Stat. Mech. (2009) P02035] by Prosen and \v{Z}nidari\v{c}. Here we propose a variant of this method based on detailed balance of ... More
Static-response theory and the roton-maxon spectrum of a flattened dipolar Bose-Einstein condensateJan 15 2019Important information for the roton-maxon spectrum of a flattened dipolar Bose-Einstein condensate can be extracted by applying a static perturbation exhibiting a periodic in-plane modulation. By solving the Gross-Pitaevskii equation in the presence of ... More
A scalable hardware and software control apparatus for experiments with hybrid quantum systemsJan 15 2019Modern experiments with fundamental quantum systems - like ultracold atoms, trapped ions, single photons - are managed by a control system formed by a number of input/output electronic channels governed by a computer. In hybrid quantum systems, where ... More
Minimal scattering entanglement in one-dimensional trapped gasesJan 14 2019The prospect of controlling entanglement in interacting quantum systems offers a myriad of technological and scientific promises, given the progress in experimental studies in systems such as ultracold trapped gases. This control is often challenging ... More
Absence of topology in Gaussian mixed states of bosonsJan 14 2019In a recent paper [Bardyn et al. Phys. Rev. X 8, 011035 (2018)], it was shown that the generalization of the many-body polarization to mixed states can be used to construct a topological invariant which is also applicable to finite-temperature and non-equilibrium ... More
Leggett mode in a two-component Fermi gas with dipolar interactionsJan 14 2019We develop an effective field theory to understand collective modes of a three-dimensional two-component Fermi superfluid with dipolar inter-particle interactions, which are modeled by an idealized separable potential. We first examine the phase transition ... More
Nonlinear Waves in an Experimentally Motivated Ring-shaped Bose-Einstein Condensate SetupJan 13 2019We systematically construct stationary soliton states in a one-component, two-dimensional, repulsive, Gross-Pitaevskii equation with a ring-shaped target-like trap similar to the potential used to confine a Bose-Einstein condensate in a recent experiment ... More
Efimov universality with Coulomb interactionJan 11 2019The universal properties of charged particles are modified by the presence of a long-range Coulomb interaction. We investigate the modification of Efimov universality as a function of the Coulomb strength using the Gaussian expansion method. The resonant ... More
Artificial gauge fields with ultracold atomsJan 11 2019Gauge fields are ubiquitous in nature. In the context of quantum electrodynamics, you may be most familiar with the photon, which represents the gauge field mediating electromagnetic forces. But there are also gluons, which mediate strong forces, and ... More
Few-boson system with a single impurity: Universal bound states tied to Efimov trimersJan 11 2019Small weakly-bound droplets determine a number of properties of ultracold Bose and Fermi gases. For example, Efimov trimers near the atom-atom-atom and atom-dimer thresholds lead to enhanced losses from bosonic clouds. Generalizations to four- and higher-body ... More
Emergence and stability of spontaneous vortex lattices in exciton-polariton condensatesJan 10 2019Jan 11 2019The spontaneous formation of lattice structure of quantized vortices is a characteristic feature of superfluidity in closed systems under thermal equilibrium. In exciton-polariton Bose-Einstein condensate, which is a typical example of macroscopic quantum ... More
Quantum Brownian motion in a quasiperiodic potentialJan 09 2019We consider a quantum particle subject to Ohmic dissipation, moving in a bichromatic quasiperiodic potential. In a periodic potential the particle undergoes a zero-temperature localization-delocalization transition as dissipation strength is decreased. ... More
Angular Stripe Phase in Spin-Orbital-Angular-Momentum Coupled Bose CondensatesJan 09 2019Jan 10 2019We propose that novel superfluid with supersolid-like properties - angular stripe phase - can be realized in a two-dimensional spin-1/2 Bose gas with spin-orbital-angular-momentum coupling. We predict a rich ground-state phase diagram, including the vortex-antivortex ... More