FERMIONS IN MAGNETIC-FIELD VERSUS HARD-CORE BOSONS IN 2 DIMENSIONS

被引：2
|
作者：
MATSUI, T
SAKAKIBARA, K
TAKANO, H
机构：
[1] JOETSU UNIV EDUC,CTR INFORMAT,JOETSU 943,JAPAN
[2] NARA NATL COLL TECHNOL,DEPT PHYS,YAMATO KORIYAMA 63911,JAPAN
来源：
PHYSICS LETTERS A | 1994年 / 194卷 / 5-6期
基金：
日本学术振兴会;
关键词：
D O I：
10.1016/0375-9601(94)91299-8
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Following the work of Canright, Girvin and Brass [Phys. Rev. Lett. 63 (1989) 2291], we scrutinize the fermionic mean-field theory for the two-dimensional s = 1/2 XY spin model of hard-core bosons. Using nonlocal vertex operators and fermion correlators in a constant magnetic field, we calculated the spin-spin correlations, which show a Bose condensation. The mean-field theory is appropriate not only for the ground state but also for the low-lying excited states.
引用
收藏
页码：413 / 418
页数：6
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