Quantum states of p-band bosons in optical lattices

Anssi Collin, Jonas Larson, Jani-Petri Martikainen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

We study a gas of repulsively interacting bosons in the first excited band of an optical lattice. We explore this p-band physics both within the framework of a standard mean-field theory as well as with the more accurate generalized Gutzwiller ansatz. We find the phase diagrams for two- and three-dimensional systems and characterize the first Mott-states which typically possess an integer or half-integer vortex structure. Furthermore, we find that even though the p-band model has strongly anisotropic kinetic energies and interflavor interaction terms are missing in the lowest band theory, the mean-field theory becomes useful quite rapidly once the transition from the Mott insulator to the superfluid is crossed.
Original languageEnglish
Article number023605
JournalPhysical Review A
Volume81
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

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