Suman Sinha, Soumen Kumar Roy
Published 2009-11-05, updated 2010-03-26Version 3
Monte Carlo simulation has been performed on a classical two dimensional XY- model with a modified form of interaction potential to investigate the role of topological defects on the phase transition exhibited by the model. In simulations in a restricted ensemble without defects, the system appears to remain ordered at all temperatures. Suppression of topological defects on the square plaquettes in the modified XY- model leads to complete elimination of the phase transition observed in this model.
Comments: 19 pages, 12 figures, Accepted for publication in Phys. Rev. E
Journal: Phys. Rev. E 81, 041120 (2010)
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