Ultracold Bosonic Atoms in Disordered Optical Superlattices

Details Ultracold Bosonic Atoms in Disordered Optical Superlattices Ultracold Bosonic Atoms in Disordered Optical Superlattices

2002-05-20

arxiv.org/abs/cond-mat/0205412v1

J. Opt. B: Quantum Semiclass. Opt. 5 (2003) S50

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures, using REVTEX4

Scientific paper

The influence of disorder on ultracold atomic Bose gases in quasiperiodic optical lattices is discussed in the framework of the one-dimensional Bose-Hubbard model. It is shown that simple periodic modulations of the well depths generate a rich phase diagram consisting of superfluid, Mott insulator, Bose-glass and Anderson localized phases. The detailed evolution of mean occupation numbers and number fluctuations as function of modulation amplitude and interaction strength is discussed. Finally, the signatures of the different phases, especially of the Bose-glass phase, in matter-wave interference experiments are investigated.

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