Multiband bosons in optical lattices
Other Condensed Matter
2013-05-29 v2 Quantum Physics
Abstract
We study a gas of repulsively interacting bosons in an optical lattice and explore the physics beyond the lowest band Hubbard model. Utilizing a generalized Gutzwiller ansatz, we find how the lowest band physics is modified by the inclusion of the first excited bands. In contrast to the prediction of the lowest band Bose-Hubbard model, a reentrant behavior of superfluidity is envisaged as well as decreasing width of the Mott lobes at strong coupling.
Keywords
Cite
@article{arxiv.0811.1537,
title = {Multiband bosons in optical lattices},
author = {J. Larson and A. Collin and J. -P. Martikainen},
journal= {arXiv preprint arXiv:0811.1537},
year = {2013}
}