Latest in cond-mat.quant-gas
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Nests and Chains of Hofstadter ButterfliesAug 22 2019The \lq Hofstadter butterfly', a plot of the spectrum of an electron in a two-dimensional periodic potential with a uniform magnetic field, contains subsets which resemble small, distorted images of the entire plot. We show how the sizes of these sub-images ... More Multimode probing of superfluid $\mathbf{^4He}$ by tuning forksAug 21 2019Flexural mode vibrations of miniature piezoelectric tuning forks (TF) are known to be highly sensitive to superfluid excitations and quantum turbulence in $\mathrm{^3He}$ and $\mathrm{^4He}$ quantum fluids, as well as to the elastic properties of solid ... More On the hydrodynamic formalism of the Gross-Pitaevskii fieldAug 19 2019We derive a canonical formalism for the hydrodynamic representation of the Gross-Pitaevskii field (nonlinear Schr\"odinger field), where the density and the phase of the condensate form a canonical pair of conjugate field variables. To do so, we treat ... More Extreme fluctuations of entropies in quantum systemsAug 19 2019The intuition that we have about entropy -- coming largely from the Boltzmann entropy -- is that the maximum entropy state is very close to the equilibrium state, while low entropy is associated with highly non-equilibrium states. It this paper, we investigate ... More Non-spreading matter-wave packets in a ringAug 17 2019Non-spreading wave packets and matter-wave packets in ring traps both have attracted great research interests due to their miraculous physical properties and tempting applications for quite a long time. Here, we proved that there exists only one set of ... More An atomic array optical clock with single-atom readoutAug 15 2019Measuring time is central to all sciences. Currently, the most accurate and stable clocks are based on optical interrogation of either a single ion or an ensemble of neutral atoms confined in an optical lattice. Here we demonstrate a new optical clock ... More Observation of Dynamical FermionizationAug 14 2019We observe dynamical fermionization, where the momentum distribution of a Tonks-Girardeau (T-G) gas of strongly interacting bosons in 1D evolves from bosonic to fermionic after its axial confinement is removed. The asymptotic momentum distribution after ... More Global Symmetry and Maximal ChaosAug 14 2019In this note we study chaos in generic quantum systems with a global symmetry generalizing seminal work [arXiv : 1503.01409] by Maldacena, Shenker and Stanford. We conjecture a bound on chaos exponent in a thermodynamic ensemble at temperature $T$ and ... More Interaction Control of Ultracold Alkaline-Earth AtomsAug 14 2019Ultracold alkaline-earth atoms have now been widely explored for precision measurements and quantum simulation. Because of its unique atomic structure, alkaline earth atoms possess great advantages for quantum simulation and studying quantum many-body ... More Criticality of Spin Systems with Weak Long-Range InteractionsAug 13 2019The study of critical properties of systems with long-range interactions has attracted in the last decades a continuing interest and motivated the development of several analytical and numerical techniques, in particular in connection with spin models. ... More Frustrated orbital Feshbach resonances in a Fermi gasAug 13 2019The orbital Feshbach resonance (OFR) is a novel scheme for magnetically tuning the interactions in closed-shell fermionic atoms. Remarkably, unlike the Feshbach resonances in alkali atoms, the open and closed channels of the OFR are only very weakly detuned ... More Dark-State Optical Potential Barriers with Nanoscale SpacingAug 12 2019Optical potentials have been a versatile tool for the study of atomic motions and many-body interactions in cold atoms. Recently, optical subwavelength single barriers were proposed to enhance the atomic interaction energy scale, which is based on non-adiabatic ... More Clustering of Four-Component Unitary FermionsAug 12 2019Ab initio nuclear physics tackles the problem of strongly interacting four-component fermions. The same setting could foreseeably be probed experimentally in ultracold atomic systems, where two- and three-component experiments have led to major breakthroughs ... More Tightening the Lieb-Robinson bound in locally-interacting systemsAug 12 2019Aug 19 2019The Lieb-Robinson (LR) bound rigorously shows that in quantum systems with short-range interactions, the maximum amount of information that travels beyond an effective "light cone" decays exponentially with distance from the light-cone front, which expands ... More Many-body dynamical localization and thermalizationAug 11 2019We demonstrate dynamical localization in a generic setup of two weakly-coupled chaotic subsystems. The minimal subsystem of experimental interest is a 3-mode Bose-Hubbard trimer. We clarify the procedure for identification of a mobility edge in the chaotic ... More Doublon dynamics of Bose-Fermi mixtures in optical latticesAug 10 2019We study the out-of-equilibrium dynamics of a dilute, lattice-confined Bose-Fermi mixture initialized in a highly excited state consisting of boson-fermion pairs (doublons) occupying single lattice sites. This system represents a paradigmatic case for ... More Imaging the hydrodynamics of a single polaritonAug 09 2019Semiconductor devices are strong competitors in the race for the development of quantum computational systems. In this work, we interface two semiconductor building blocks of different dimensionality and with complementary properties: (1) a quantum dot ... More Critical fluctuations at a many-body exceptional pointAug 08 2019Critical phenomena arise ubiquitously in various context of physics, from condensed matter, high energy physics, cosmology, to biological systems, and consist of slow and long-distance fluctuations near a phase transition or critical point. Usually, these ... More Cluster stability driven by quantum fluctuationsAug 08 2019By means of an accurate path-integral Monte Carlo we investigate a two-dimensional ensemble of particles interacting via a Lifshitz-Petrich-Gaussian potential. In particular, analysing structures described by a commensurate ratio between the two wave ... More Integrable model of a $p$-wave bosonic superfluidAug 07 2019We present an exactly-solvable $p$-wave pairing model for two bosonic species. The model is solvable in any dimension and it shows striking similarities with the $p+ip$ Richardson-Gaudin fermionic model. As the fermionic model, our bosonic counterpart ... More Quantum Overlapping TomographyAug 07 2019It is now experimentally possible to entangle thousands of qubits, and efficiently measure each qubit in parallel in a distinct basis. To fully characterize an unknown entangled state of $n$ qubits, one requires an exponential number of measurements in ... More Floating Phases in One-Dimensional Rydberg Ising ChainsAug 06 2019We report on the quantitative ground state phase diagram of a van der Waals interacting chain of Rydberg atoms. These systems are known to host crystalline phases locked to the underlying lattice as well as a gapped, disordered phase. We locate and characterize ... More Chaos induced breakdown of Bose-Hubbard modelingAug 06 2019We show that the Bose-Hubbard approximation fails due to the emergence of chaos, even when excited modes are far detuned and the standard validity condition is satisfied. This is formally identical to the Melnikov-Arnold analysis of the stochastic pump ... More Designing Arbitrary One-dimensional Potentials on an Atom ChipAug 05 2019We use laser light shaped by a digital micro-mirror device to realize arbitrary optical dipole potentials for one-dimensional (1D) degenerate Bose gases of 87Rb trapped on an atom chip. Superposing optical and magnetic potentials combines the high flexibility ... More Decay of a Quantum KnotAug 04 2019We experimentally study the dynamics of quantum knots in a uniform magnetic field in spin-1 Bose-Einstein condensates. The knot is created in the polar magnetic phase, which rapidly undergoes a transition towards the ferromagnetic phase in the presence ... More Non-Hermitian Topological Anderson InsulatorsAug 03 2019Non-Hermitian systems can exhibit unique topological and localization properties. Here we elucidate the non-Hermitian effects on disordered topological systems by studying a non-Hermitian disordered Su-Schrieffer-Heeger model with nonreciprocal hoppings. ... More Free Fermions with a Localized SourceAug 02 2019We study an open quantum system of free fermions on an infinite lattice coupled to a localized particle source. In the long time limit, the total number of fermions in the system increases linearly with growth rate dependent on the lattice geometry and ... More Critical response of a quantum van der Pol oscillatorAug 02 2019Classical nonequilibrium systems close to a dynamical critical point are known to exhibit a strongly nonlinear response, resulting in very high sensitivity to weak external perturbations. This attribute is key to the operation of important biological ... More Application of renormalized RPA to polarized Fermi gasesAug 01 2019We consider a spin imbalanced Fermi gas at zero temperature in the normal phase and located on the BCS side of the BCS-BEC crossover. We compute the critical polarization for pairing, the correlated occupation numbers and the contact in the framework ... More Strongly correlated quantum droplets in quasi-1D dipolar Bose gasJul 31 2019We exploit a few- to many-body approach to study strongly interacting dipolar bosons in the quasi-one-dimensional system. The dipoles attract each other while the short range interactions are repulsive. Solving numerically exactly the multi-atom Schr\"{o}dinger ... More Direct Observation of Ultracold Bimolecular ReactionsJul 31 2019Chemical reactions result in the conversion of reactants to products through an intermediate state or a transition state. Unambiguous identifications of and investigations of chemical reactions are thus most complete when detecting all of the involved ... More Measuring the time a tunnelling atom spends in the barrierJul 31 2019Tunnelling is one of the most paradigmatic and evocative phenomena of quantum physics, underlying processes such as photosynthesis and nuclear fusion, as well as devices ranging from SQUID magnetometers to superconducting qubits for quantum computers. ... More