Bose-Hubbard model with random impurities: Multiband and nonlinear hopping effects
Abstract
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 exists after the addition of the hopping disorder.
Cite
@article{arxiv.1410.1034,
title = {Bose-Hubbard model with random impurities: Multiband and nonlinear hopping effects},
author = {Julia Stasińska and Mateusz Łącki and Omjyoti Dutta and Jakub Zakrzewski and Maciej Lewenstein},
journal= {arXiv preprint arXiv:1410.1034},
year = {2014}
}
Comments
version accepted in Phys. Rev. A