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

References in corpus (2)

• Superfluidity of Bose-Einstein Condensate in An Optical Lattice: Landau-Zener Tunneling and Dynamical Instability
• Decay of a superfluid currents in a moving system of strongly interacting bosons

Cited by in corpus (4)

• Semiclassical quantization of the Bogoliubov spectrum
• Many-body Landau-Zener tunneling in the Bose-Hubbard model
• Decay of superfluid currents in the interacting one-dimensional Bose gas
• Engineering many-body quantum dynamics by disorder