Persistent current of atoms in a ring optical lattice

Abstract

We consider a small ensemble of Bose atoms in a ring optical lattice with weak disorder. The atoms are assumed to be initially prepared in a superfluid state with non-zero quasimomentum and, hence, may carry matter current. It is found that the atomic current persists in time for a low value of the quasimomentum but decays exponentially for a high (around one quater of the Brillouin zone) quasimomentum. The explanation is given in terms of low- and high-energy spectra of the Bose-Hubbard model, which we describe using the Bogoliubov and random matrix theories, respectively.

17 pages, IOP-style

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Cited by in corpus (18)

• Bloch oscillations of Bose-Einstein condensates: Quantum counterpart of dynamical instability
• Entanglement enhanced atomic gyroscope
• Theory of superfluidity and drag force in the one-dimensional Bose gas
• Semiclassical quantization of the Bogoliubov spectrum
• Bose-Hubbard Hamiltonian: Quantum Chaos approach
• Exact results for persistent currents of two bosons in a ring lattice
• Many-body Landau-Zener tunneling in the Bose-Hubbard model
• Decay of superfluid currents in the interacting one-dimensional Bose gas
• Criticality and Spin Squeezing in the Rotational Dynamics of a BEC on a Ring Lattice
• Understanding quantum work in a quantum many-body system
• Engineering many-body quantum dynamics by disorder
• Atomic current in optical lattices: Esaki-Tsu equation revisited
• Robustness of discrete semifluxons in closed Bose-Hubbard chains
• Blocked populations in ring-shaped optical lattices
• Superfluidity breakdown of periodic matter waves in quasi one-dimensional annular traps via resonant scattering with moving defects
• Spontaneous currents in a bosonic ring
• Influence of quantum fluctuations on the superfluid critical velocity of a one-dimensional Bose gas
• Instability and particle current control of a parametrically driven Bose-Einstein condensate in a ring-shaped lattice