Sine-Gordon description of Beresinskii-Kosterlitz-Thouless physics at finite magnetic field

Details Sine-Gordon description of Beresinskii-Kosterlitz-Thouless physics at finite magnetic field Sine-Gordon description of Beresinskii-Kosterlitz-Thouless physics at finite magnetic field

2007-07-09

arxiv.org/abs/0707.1271v2

Phys. Rev. Lett. 99, 207002 (2007)

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures, to appear on Physical Review Letters

Scientific paper

10.1103/PhysRevLett.99.207002

The Beresinskii-Kosterlitz-Thouless (BKT) physics of vortices in two-dimensional superconductors at finite magnetic field is investigated by means of a field-theoretical approach based on the sine-Gordon model. This description leads to a straightforward definition of the field-induced magnetization and shows that the persistence of non-linear effects at low fields above the transition is a typical signature of the fast divergence of the correlation length within the BKT theory.

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