Confined p-band Bose-Einstein condensates
2012 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 85, no 3, 033638Article in journal (Refereed) Published
We study bosonic atoms on the p band of a two-dimensional optical square lattice in the presence of a confining trapping potential. Using a mean-field approach, we show how the anisotropic tunneling for p-band particles affects the cloud of condensed atoms by characterizing the ground-state density and the coherence properties of the atomic states both between sites and atomic flavors. In contrast to the usual results based on the local-density approximation, the atomic density can become anisotropic. This anisotropic effect is especially pronounced in the limit of weak atom-atom interactions and of weak lattice amplitudes, i.e., when the properties of the ground state are mainly driven by the kinetic energies. We also investigate how the trap influences known properties of the nontrapped case. In particular, we focus on the behavior of the antiferromagnetic vortex-antivortex order, which for the confined system is shown to disappear at the edges of the condensed cloud.
Place, publisher, year, edition, pages
2012. Vol. 85, no 3, 033638
Research subject Theoretical Physics
IdentifiersURN: urn:nbn:se:su:diva-76124DOI: 10.1103/PhysRevA.85.033638ISI: 000301970900008OAI: oai:DiVA.org:su-76124DiVA: diva2:526174