On Defect-Mediated Transitions in Bosonic Planar Lattices
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.
- Publication:
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arXiv e-prints
- Pub Date:
- June 2005
- DOI:
- 10.48550/arXiv.cond-mat/0506108
- arXiv:
- arXiv:cond-mat/0506108
- Bibcode:
- 2005cond.mat..6108T
- Keywords:
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- Statistical Mechanics
- E-Print:
- Laser Physics 15, 669 (2005)