Defect fugacity, Spinwave Stiffness and T_c of the 2-d Planar Rotor Model

Details Defect fugacity, Spinwave Stiffness and T_c of the 2-d Planar Rotor Model Defect fugacity, Spinwave Stiffness and T_c of the 2-d Planar Rotor Model

2000-01-21

arxiv.org/abs/cond-mat/0001309v1

Physics

Condensed Matter

Statistical Mechanics

7 pages, 4 figures

Scientific paper

10.1209/epl/i2000-00322-3

We obtain precise values for the fugacities of vortices in the 2-d planar rotor model from Monte Carlo simulations in the sector with {\em no} vortices. The bare spinwave stiffness is also calculated and shown to have significant anharmonicity. Using these as inputs in the KT recursion relations, we predict the temperature T_c = 0.925, using linearised equations, and $T_c = 0.899 \pm >.005$ using next higher order corrections, at which vortex unbinding commences in the unconstrained system. The latter value, being in excellent agreement with all recent determinations of T_c, demonstrates that our method 1) constitutes a stringent measure of the relevance of higher order terms in KT theory and 2) can be used to obtain transition temperatures in similar systems with modest computational effort.

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