Glassy features of a Bose glass

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 pa...

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Bibliographic Details
Published inLaser physics Vol. 18; no. 5; pp. 653 - 658
Main Authors Buonsante, P., Massel, F., Penna, V., Vezzani, A.
Format Journal Article
LanguageEnglish
Published Dordrecht SP MAIK Nauka/Interperiodica 01.05.2008
Subjects
Lasers
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Physics of Cold Trapped Atoms
05.30.Jp
03.75.Lm
64.60.Cn
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Summary: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.
ISSN:1054-660X
1555-6611
DOI:10.1134/S1054660X08050174