The Two dimensional XY model at the transition temperature: A High precision Monte Carlo study

Feb, 2005
22 pages
Published in:
  • J.Phys.A 38 (2005) 5869-5884
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Abstract: (arXiv)
We study the classical XY (plane rotator) model at the Kosterlitz-Thouless phase transition. We simulate the model using the single cluster algorithm on square lattices of a linear size up to L=2048.We derive the finite size behaviour of the second moment correlation length over the lattice size xi_{2nd}/L at the transition temperature. This new prediction and the analogous one for the helicity modulus are confronted with our Monte Carlo data. This way beta_{KT}=1.1199 is confirmed as inverse transition temperature. Finally we address the puzzle of logarithmic corrections of the magnetic susceptibility chi at the transition temperature.
Note:
  • 22 pages Subj-class: Statistical Mechanics
  • 68.35.Rh
  • 05.10.Ln
  • 75.10.Hk