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arXiv · 1304.0554

Exotic phases of interacting p-band bosons

F. Hébert·Zi Cai·V. G. Rousseau·Congjun Wu·R. T. Scalettar·G. G. Batrouni
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Abstract

We study a model of interacting bosons that occupy the first excited p-band states of a two-dimensional optical lattice. In contrast to the much studied single band Bose-Hubbard Hamiltonian, this more complex model allows for non-trivial superfluid phases associated with condensation at non-zero momentum and staggered order of the orbital angular momentum in addition to the superfluid-Mott insulator transition. More specifically, we observe staggered orbital angular momentum order in the Mott phase at commensurate filling and superfluidity at all densities. We also observe a transition between the staggered angular momentum superfluid phase and a striped superfluid, with an alternation of the phase of the superfluid along one direction. The transition between these two phases was observed in a recent experiment, which is then qualitatively well described by our model.

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F. Hébert, Zi Cai, V. G. Rousseau, Congjun Wu, R. T. Scalettar, G. G. Batrouni. 2013-04-02. Exotic phases of interacting p-band bosons. https://doi.org/10.1103/physrevb.87.224505

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