Vortices represent a certain class of defects in some systems like
superfluids, superconductors or spin systems. In this block we consider
their structure, energy and the Bereshinsky-Kosterlitz-Thoulous transition.
vortex structure in an XY-model and energy
BKT argument for the phase transition, characterization of phase
transition
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[1] P.M. Chaikin and T.C. Lubensky; Principles of condensed matter
physics, Chapt. 9.
[2] M. Tinkham, Introduction to Superconductivity
[3] P. G. de Gennes, Superconductivity in Metals and Alloys.
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