On Defect-Mediated Transitions in Bosonic Planar Lattices

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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.

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Statistical Mechanics

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http://salesiana.dossiersoluciones.com/handle/123456789/26467

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0506108
 http://arxiv.org/abs/cond-mat/0506108
 Laser Physics 15, 669 (2005)

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arXiv