Monte Carlo study of the Villain version of the fully frustrated XY model

Abstract

The fully frustrated XY model with Villain interaction on a square lattice is studied by means of Monte Carlo simulations. On the basis of the universal jump condition it is argued that there are two distinct transitions in the model, corresponding to the loss of XY order and Z_2 order, respectively. The Kosterlitz-Thouless (KT) transition is analyzed by finite size scaling of the helicity modulus at lattices of size L = 32 through 128, giving T_KT = 0.8108(1). The vorticity-vorticity correlation function is used to determine two different characteristic lengths, the Z_2 correlation length ξ, and the screening length λ, associated with the KT transition and free vortices. The temperature dependence of ξis examined in order to determine T_c and the correlation length exponent, ν. The exponent is found to be consistent with the 2D Ising value, ν= 1, and the obtained critical temperature is T_c = 0.8225(5). The determinations of both ξand νare done carefully, first applying the techniques to the 2D Ising model, which serves as a convenient testing ground.

56 pages, 31 sub-figures, submitted to Phys Rev B

References in corpus (2)

• Two phase transitions in the fully frustrated $XY$ model
• Conformal Anomaly and Critical Exponents of the XY-Ising Model

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