MICROCANONICAL MONTE CARLO STUDY OF FIRST-ORDER TRANSITION IN A 2D CLASSICAL XY-MODEL

摘要

The microcanonical ensemble given by Boltzmann is used in the computer Monte Carlo simulation of 2D classical XY-model with the modified nearest neighbour interaction potential suggested by Domany, Schick and Swendsen. A relatively simple method to identify first-order transition in computer simulations of a statistical system is described. The critical value of p2 in this XY-model is determined using this method; which is found to increase with system size obeying a power law.