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arXiv:0805.0227 · The European Physical Journal D

One-dimensional phase transitions in a two-dimensional optical lattice

Magnus Rehn, Sara Bergkvist, Anders Rosengren, Robert Saers, Martin Zelán, Emil Lundh, Anders Kastberg

Published Aug 2, 2008• 4 citations
arXivHTMLPDF
DOI
10.1140/epjd/e2008-00152-9

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We study the phase diagram of spin-one polar condensates in a two-dimensional optical lattice with magnetic anisotropy. We show that the topological binding of vorticity to nematic disclinations allows for a rich variety of phase transitions. These include Kosterlitz-Thouless-like transitions with a superfluid stiffness jump that can be experimentally tuned to take a continuous set of values, and a cascaded Kosterlitz-Thouless transition, characterized by two divergent length scales. For higher integer spin bosons SSS, the thermal phase transition out of the planar polar phase is strongly affected by the parity of SSS.