Multiband bosons in optical lattices

Details Multiband bosons in optical lattices Multiband bosons in optical lattices

2008-11-10

arxiv.org/abs/0811.1537v2

Phys. Rev. A 79, 033603 (2009)

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

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.

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