Kosterlitz-Thouless transition of quantum XY model in two dimensions

被引：72

作者：

Harada, K ^{[1
]}

Kawashima, N

机构：

[1] Kyoto Univ, Div Appl Syst Sci, Sakyo Ku, Kyoto 6068501, Japan

[2] Toho Univ, Dept Phys, Chiba 2748510, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1998年 / 67卷 / 08期

关键词：

quantum XY model; Kosterlitz-Thouless transition; quantum Monte Carlo; helicity modulus;

D O I：

10.1143/JPSJ.67.2768

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The two-dimensional S = 1/2 XY model is investigated with an extensive quantum Monte Carlo simulation. The helicity modulus is precisely estimated through a continuous-time loop algorithm for systems up to 128 x 128 near and below the critical temperature. The critical temperature is estimated as T-KT = 0.3427(2)J. The obtained estimates for the helicity modulus are well fitted hy a scaling form derived from the Kosterlitz renormalization group equation. The validity of the Kosterlitz-Thouless theory for this model is confirmed.

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收藏

页码：2768 / 2776

页数：9

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