Mean-field phase diagram of cold lattice bosons in disordered potentials

Year: 2007

Authors: Buonsante P., Penna V., Vezzani A., Blakie P.B.

Autors Affiliation: [1,2] Dipartimento di Fisica, Politecnico di Torino Corso Duca degli Abruzzi 24, I-10129 Torino, Italy
[1,4] Jack Dodd Centre for Photonics and Ultra-Cold Atoms, Department of Physics, University of Otago, P.O. Box 56, Dunedin, New Zealand
[3] Dipartimento di Fisica, Università degli Studi di Parma and C.N.R.-I.N.F.M., Parco Area delle Scienze 7/a, I-43100 Parma, Italy

Abstract: We address the phase diagram of the disordered Bose-Hubbard model that has been realized in several recent experiments in terms of optically trapped ultracold bosons. We show that a systematic description of all of the expected quantum phases can be obtained at both zero and finite temperature via a site-dependent decoupling mean-field approach. Also, we relate the boundaries of the Mott-insulating phase to an off-diagonal noninteracting Anderson model whose spectral features provide an avenue for determining the debated nature of the phase surrounding the Mott lobes. Our approach is simple yet effective, and scalable to systems with experimentally relevant sizes and features.

Journal/Review: PHYSICAL REVIEW A

Volume: 76 (1)      Pages from: 011602-1  to: 011602-4

More Information: Rapid Communication
KeyWords: ultracold atoms; bosons; quantum phase transitions; optical lattice; disorder
DOI: 10.1103/PhysRevA.76.011602

Citations: 45
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