Glassy features of a Bose glass

Year: 2008

Authors: Buonsante P., Massel F., Penna V., Vezzani A.

Autors Affiliation: Politecn Torino, Dipartimento Fis, Turin, Italy; Politecn Torino, CNISM, Turin, Italy; Univ Parma, Dipartimento Fis, I-43100 Parma, Italy

Abstract: We study a two-dimensional Bose-Hubbad model at a zero temperature with random local potentials in the presence of either uniform or binary disorder. Many low-energy metastable configurations are found with virtually the same energy as the ground state. These are characterized by the same blotchy pattern of the, in principle, complex nonzero local-order parameter as the ground state. Yet, unlike the ground state, each island exhibits an overall random independent phase. The different phases in different coherent islands could provide a further explanation for the lack of coherence observed in experiments on Bose glasses.

Journal/Review: LASER PHYSICS

Volume: 18 (5)      Pages from: 653  to: 658

KeyWords: ultracold atoms; optical lattices; disordered system; phase transition; Bose-Glass
DOI: 10.1134/S1054660X08050174

Citations: 5
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