Glassy features of a Bose Glass

Details Glassy features of a Bose Glass Glassy features of a Bose Glass

2009-02-19

arxiv.org/abs/0902.3404v2

Laser Physics 18 (5) (2008) 653

Physics

Condensed Matter

Statistical Mechanics

14 pages, 4 figures;

Scientific paper

10.1134/S1054660X08050174

We study a two-dimensional Bose-Hubbard 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.

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