Interaction-induced decoherence of atomic Bloch oscillations

Abstract

We show that the energy spectrum of the Bose-Hubbard model amended by a static field exhibits Wigner-Dyson level statistics. In itself a characteristic signature of quantum chaos, this induces the irreversible decay of Bloch oscillations of cold, interacting atoms loaded into an optical lattice, and provides a Hamiltonian model for interaction induced decoherence.Comment: revtex4, figure 3 is substituted, small changes in the tex