Mean-field phase diagram for Bose-Hubbard Hamiltonians with random hopping
Statistical Mechanics
2009-11-11 v1 Other Condensed Matter
Abstract
The zero-temperature phase diagram for ultracold Bosons in a random 1D potential is obtained through a site-decoupling mean-field scheme performed over a Bose-Hubbard (BH) Hamiltonian whose hopping term is considered as a random variable. As for the model with random on-site potential, the presence of disorder leads to the appearance of a Bose-glass phase. The different phases -i.e. Mott insulator, superfluid, Bose-glass- are characterized in terms of condensate fraction and superfluid fraction. Furthermore, the boundary of the Mott lobes are related to an off-diagonal Anderson model featuring the same disorder distribution as the original BH Hamiltonian.
Keywords
Cite
@article{arxiv.cond-mat/0611059,
title = {Mean-field phase diagram for Bose-Hubbard Hamiltonians with random hopping},
author = {P. Buonsante and F. Massel and V. Penna and A. Vezzani},
journal= {arXiv preprint arXiv:cond-mat/0611059},
year = {2009}
}
Comments
7 pages, 6 figures. Submitted to Laser Physics