Bose-Hubbard model with random impurities: Multiband and nonlinear hopping effects

Bibliographic description

punktacja MEiN [2014 A]: 35

title:	Bose-Hubbard model with random impurities: Multiband and nonlinear hopping effects
author:	Stasińska Julia, Łącki Mateusz , Dutta Omjyoti , Zakrzewski Jakub , Lewenstein Maciej
journal title:	Physical Review. A, Atomic, Molecular, and Optical Physics
volume:	90
issue:	6
date of publication :	2014
article ID:	063634
ISSN:	1050-2947
eISSN:	1094-1622 1538-4446
DOI:	10.1103/PhysRevA.90.063634
language:	English
journal language:	English
abstract in English:	We investigate the phase diagrams of theoretical models describing bosonic atoms in a lattice in the presence of randomly localized impurities. By including multiband and nonlinear hopping effects we enrich the standard model containing only the chemical-potential disorder with the site-dependent hopping term. We compare the extension of the MI and the BG phase in both models using a combination of the local mean-field method and a Hartree-Fock-like procedure, as well as the Gutzwiller-ansatz approach. We show analytical argument for the presence of triple points in the phase diagram of the model with chemical-potential disorder. These triple points, however, cease to exist after the addition of the hopping disorder.
affiliation:	Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
type:	journal article
subtype:	academic paper

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