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arXiv · 1203.4402

Multi-orbital bosons in bipartite optical lattices

Jani-Petri Martikainen·Jonas Larson
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Abstract

We study interacting bosons in a two dimensional bipartite optical lattice. By focusing on the regime where the first three excited bands are nearly degenerate we derive a three orbital tight-binding model which captures the most relevant features of the bandstructure. In addition, we also derive a corresponding generalized Bose-Hubbard model and solve it numerically under different situations, both with and without a confining trap. It is especially found that the hybridization between sublattices can strongly influence the phase diagrams and in a trap enable even appearances of condensed phases intersecting the same Mott insulating plateaus.

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Jani-Petri Martikainen, Jonas Larson. 2012-03-20. Multi-orbital bosons in bipartite optical lattices. https://doi.org/10.1103/physreva.86.023611

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