SEARCH FOR A HOPF TERM IN A DOPED SPIN-FERMION SYSTEM IN 2 DIMENSIONS

被引：11
作者：
MURAMATSU, A
机构：
[1] Physikalisches Institut, Universität Ẅrzburg
来源：
PHYSICAL REVIEW LETTERS | 1990年 / 65卷 / 23期
关键词：
44;
D O I：
10.1103/PhysRevLett.65.2909
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
It is shown that the long-wavelength limit of a doped spin-fermion model does not contain the Hopf invariant, when expanded around a staggered spin configuration. Furthermore, the resulting effective action that describes the destruction of long-range antiferromagnetic order by doping is an O(3) nonlinear model with coupling constants that depend on the dopant concentration. © 1990 The American Physical Society.
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页码：2909 / 2912
页数：4
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