NEW CRITICAL-POINT FOR 2-DIMENSIONAL XY-TYPE MODELS

被引：48

作者：

JONSSON, A

MINNHAGEN, P

NYLEN, M

机构：

[1] Department of Theoretical Physics, Umeå University

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.70.1327

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A new critical point is established through Monte Carlo simulations for a class of two dimensional XY models with a modified nearest-neighbor spin interaction. The critical exponents found are nu almost-equal-to 1.4, beta almost-equal-to 0.6, and an alpha < 0, consistent with hyperscaling. The phase transition is interpreted as a vortex-unbinding transition. Comparisons are made with the phase diagram of the two dimensional Coulomb gas and with the spin-1/2 XY model.

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页码：1327 / 1330

页数：4

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