We discuss the finite-temperature properties of Bose-Einstein condensates loaded on a 2D optical lattice. In an experimentally attainable range of parameters the system is described by the XY model, which undergoes a Berezinskii-Kosterlitz-Thouless (BKT) transition driven by the vortex pair unbinding. The interference pattern of the expanding condensates provides the experimental signature of the BKT transition: near the critical temperature, the ~k = 0 component of the momentum distribution sharply decreases.

On Defect-Mediated Transitions in Bosonic Planar Lattices

SODANO, Pasquale;
2005

Abstract

We discuss the finite-temperature properties of Bose-Einstein condensates loaded on a 2D optical lattice. In an experimentally attainable range of parameters the system is described by the XY model, which undergoes a Berezinskii-Kosterlitz-Thouless (BKT) transition driven by the vortex pair unbinding. The interference pattern of the expanding condensates provides the experimental signature of the BKT transition: near the critical temperature, the ~k = 0 component of the momentum distribution sharply decreases.
2005
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/160482
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