Deconfinement in the Two Dimensional XY Model

Details Deconfinement in the Two Dimensional XY Model Deconfinement in the Two Dimensional XY Model

2001-12-06

arxiv.org/abs/cond-mat/0112106v2

Phys. Rev. Lett. 89, 035703 (2002)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures. Typos corrected, small but important change in intro. Accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.89.035703

The unbinding of vortex-antivortex pairs for the classical two-dimensional XY model in a magnetic field is studied. A single such pair is connected by a string of overturned spins, leading to linear confinement. We show that this system supports two phase transitions, one in which closed strings proliferate, and a second in which vortices unbind. The transitions are shown to be dual to one another, and are remarkably continuous. Possible consequences for a variety of systems are discussed.

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