Latest in cond-mat.quant-gas
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Absence of superfluidity in 2D dipolar Bose striped crystalsJun 13 2019We present results of computer simulations at low temperature of a two-dimensional system of dipolar bosons, with dipole moments aligned at an arbitrary angle with respect to the direction perpendicular to the plane. The phase diagram includes a homogeneous ... More Many-body topological invariants from randomized measurementsJun 12 2019The classification of symmetry-protected topological (SPT) phases in one dimension has been recently achieved, and had a fundamental impact in our understanding of quantum phases in condensed matter physics. In this framework, SPT phases can be identified ... More The low-energy Goldstone mode in a trapped dipolar supersolidJun 11 2019A supersolid is a counter-intuitive state of matter that combines the frictionless flow of a superfluid with the crystal-like periodic density modulation of a solid. Since the first prediction in the 1950s, experimental efforts to realize this state have ... More Phase diagram of Rydberg-dressed Fermi gas in two dimensionsJun 10 2019Rydberg-dressed ultracold Fermi gas is one of the latest quantum many-body systems where the sign, strength, and range of the interaction can be controlled experimentally. The interaction in momentum space has a negative minimum at $q_c$ inversely proportional ... More How much entanglement can be created in a closed system?Jun 10 2019In a closed system, the total number of particles is fixed. We ask how much does this conservation law restricts the amount of entanglement that can be created. We derive a tight upper bound on the bipartite entanglement entropy in closed systems, and ... More Mass-energy equivalence in harmonically trapped particlesJun 10 2019Precise understanding of the dynamics of trapped particles is crucial for nascent quantum technologies, including atomic clocks and quantum simulators. Here we present a framework to systematically include quantum effects arising from the mass-energy ... More Homogeneous Floquet time crystal protected by gauge invarianceJun 07 2019We show that homogeneous lattice gauge theories can realize nonequilibrium quantum phases with long-range spatiotemporal order protected by gauge invariance instead of disorder. We study a kicked $\mathbb{Z}_2$-Higgs gauge theory and find that it breaks ... More Dicke subradiance and thermal decoherenceJun 07 2019Subradiance is the cooperative inhibition of the radiation by several emitters coupled to the same electromagnetic modes. It has been predicted by Dicke in 1954 and only recently observed in cold atomic vapors. Here we address the question to what extend ... More Quantum quench in PT-symmetric Luttinger liquidJun 06 2019A Luttinger liquid (LL) describes low energy excitations of many interacting 1D systems, and exhibits universal behaviour both in and out of equilibrium. We analyze its behaviour in the non-hermitian realm after quantum quenching to a PT-symmetric LL ... More Exceptional points and the topology of quantum many-body spectraJun 05 2019We show that in a generic, ergodic quantum many-body system the interactions induce a non-trivial topology for an arbitrarily small non-hermitean component of the Hamiltonian. This is due to an exponential-in-system-size proliferation of exceptional points ... More Strong and Weak Many-Body LocalizationsJun 03 2019Many aspects of many-body localization (MBL), including dynamic classification of MBL phases, remain elusive. Here, by performing real-space renormalization group (RSRG) analysis we propose that there are two distinct types of MBL phases: "strong MBL" ... More Protected cat states from kinetic driving of a boson gasMay 31 2019We investigate the behavior of a one-dimensional Bose-Hubbard gas in both a ring and a hard-wall box, whose kinetic energy is made to oscillate with zero time-average, which suppresses first-order particle hopping. For intermediate and large driving amplitudes ... More Protected cat states from kinetic driving of a boson gasMay 31 2019Jun 07 2019We investigate the behavior of a one-dimensional Bose-Hubbard gas in both a ring and a hard-wall box, whose kinetic energy is made to oscillate with zero time-average, which suppresses first-order particle hopping. For intermediate and large driving amplitudes ... More Discrete Time CrystalsMay 30 2019Experimental advances have allowed for the exploration of nearly isolated quantum many-body systems whose coupling to an external bath is very weak. A particularly interesting class of such systems is those which do not thermalize under their own isolated ... More Dissipation induced non-stationarity in a quantum gasMay 30 2019Non-stationary long-time dynamics was recently observed in a driven two-component Bose-Einstein condensate coupled to an optical cavity [N. Dogra, et al. arXiv:1901.05974] and analyzed in mean-field theory. We provide the full solution of the underlying ... More Slow quenches in Chern insulator ribbonsMay 29 2019We investigate slow quenches in Chern insulators in ribbon geometry. We consider the Qi-Wu-Zhang model and slowly ramp the parameters (large time of the quench $\tau$) from a non-topological (Chern number = 0) to a topological regime (Chern number $\ne$ ... More Magnetic phases of orbital bipartite optical latticesMay 29 2019In the Hamburg cold atom experiment with orbital states in an optical lattice, $s$- and $p$-orbital atomic states hybridize between neighbouring sites. In this work we show how this alternation of sites hosting $s$- and $p$-orbital states gives rise to ... More Quantum entropic self-localization with ultracold fermionsMay 28 2019We study a driven, spin-orbit coupled fermionic system in a lattice at the resonant regime where the drive frequency equals the Hubbard repulsion, for which non-trivial constrained dynamics emerge at fast timescales. An effective density-dependent tunneling ... More Quantum Cluster QuasicrystalsMay 28 2019Quasicrystals remain among the most intriguing materials in physics and chemistry. Their structure results in many unusual properties including anomalously low friction as well as poor electrical and thermal conductivity but it also supports superconductivity, ... More Purity oscillations in coupled Bose-Einstein condensatesMay 28 2019It is shown that the distinct oscillations of the purity of the single-particle density matrix for many-body open quantum systems with balanced gain and loss reported by Dast et al. [Phys. Rev. A 93, 033617 (2016)] can also be found in closed quantum ... More Can three-body recombination purify a quantum gas?May 23 2019Three-body recombination in quantum gases is traditionally associated with heating, but it was recently found that it can also cool the gas. We show that in a partially condensed three-dimensional homogeneous Bose gas three-body loss could even purify ... More Resurgence for superconductorsMay 23 2019An important non-perturbative effect in quantum physics is the energy gap of superconductors, which is exponentially small in the coupling constant. A natural question is whether this effect can be incorporated in the theory of resurgence. In this paper ... More Path Integral Molecular Dynamics for BosonsMay 22 2019Trapped Bosons exhibit fundamental physical phenomena and are potentially useful for quantum technologies. We present a method for simulating Bosons using path integral molecular dynamics. A main challenge for simulations is including all permutations ... More Thermally assisted Thouless pumping in the Rice-Mele modelMay 21 2019We investigate the effect of dissipation from a thermal environment on topological pumping in the Rice-Mele model. We report that dissipation can improve the robustness of pumping quantization in a regime of finite driving frequencies. Specifically, in ... More Quantum Rydberg Central Spin ModelMay 21 2019We consider dynamics of a Rydberg impurity in a cloud of ultracold bosonic atoms in which the Rydberg electron can undergo spin-changing collisions with surrounding atoms. This system realizes a new type of the quantum impurity problem that compounds ... More Moire Localization in Two Dimensional Quasi-Periodic SystemsMay 20 2019We discuss a two-dimensional system under the perturbation of a Moire potential, which takes the same geometry and lattice constant as the underlying lattices but mismatches up to relative rotation. Such a self-dual model belongs to the orthogonal class ... More Elastic scattering of three ultracold bosonsMay 17 2019Elastic scattering of three bosons at low energy is a fundamental problem in the many-body description of ultracold Bose gases, entering via the three-body scattering hypervolume $D$. We study this quantity for identical bosons that interact via a pairwise ... More