The XY Model and the Berezinskii-Kosterlitz-Thouless Phase Transition

Details The XY Model and the Berezinskii-Kosterlitz-Thouless Phase Transition The XY Model and the Berezinskii-Kosterlitz-Thouless Phase Transition

2005-12-15

arxiv.org/abs/cond-mat/0512356v1

Physics

Condensed Matter

Statistical Mechanics

5 pages, 1 figure. Short review prepared for the Annals of the Marie Curie Fellowships

Scientific paper

In statistical physics, the XY model in two dimensions provides the paradigmatic example of phase transitions mediated by topological defects (vortices). Over the years, a variety of analytical and numerical methods have been deployed in an attempt to fully understand the nature of its transition, which is of the Berezinskii-Kosterlitz-Thouless type. These met with only limited success until it was realized that subtle effects (logarithmic corrections) that modify leading behaviour must be taken into account. This realization prompted renewed activity in the field and significant progress has been made. This paper contains a review of the importance of such subtleties, the role played by vortices and of recent and current research in this area. Directions for desirable future research endeavours are outlined.

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