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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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