Max Planck Institute for Dynamics and Self-Organization -- Department for Nonlinear Dynamics and Network Dynamics Group
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Sonderseminar

Wednesday, 21.06.2006 16:15 c.t.

Persistent current of atoms in a ring optical lattice

by Prof. Dr. Andrey R. Kolovsky
from MPI für Physik komplexer Systeme

Contact person: Holger Schanz

Location

Seminarraum Haus 2, 4. Stock (Bunsenstr.)

Abstract

We consider a small ensemble of Bose atoms in a ring optical lattice with a weak disorder. The atoms are assumed to be initially prepared in a superfluid state with non-zero quasimomentum and, hence, may carry a matter current. It is found that due to the atom-atom interactions the atomic current either persist in time or decay exponentially, depending on the initial value of the quasimomentum. The explanation is given in terms of low- and high-energy spectra of the Bose-Hubbard model, which we describe by using the Bogolubov and random matrix theories, respectively.

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