Ultracold Bosonic Atoms in Disordered Optical Superlattices

Abstract

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.

arXiv comment4 pages, 4 figures, using REVTEX4

References in corpus (5)

• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Cold bosonic atoms in optical lattices
• Strong-coupling expansions for the pure and disordered bose Hubbard model
• Mott Domains of Bosons Confined on Optical Lattices
• Density matrix renormalization group for disordered bosons in one dimension

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