AN UPPER BOUND FOR THE SPIN-WAVE SPECTRUM OF THE HEISENBERG-ANTIFERROMAGNET

被引：10

作者：

MOMOI, T

机构：

[1] Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1994年 / 63卷 / 07期

关键词：

SPIN-WAVE SPECTRUM; HEISENBERG ANTIFERROMAGNET; XXZ MODEL; SPIN-WAVE VELOCITY; SINGLE-MODE APPROXIMATION;

D O I：

10.1143/JPSJ.63.2507

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the spin-wave spectrum of the Heisenberg antiferromagnet on a bipartite lattice. The spin-wave spectrum on a Neel-ordered ground state is bounded as epsilon(k) less-than-or-equal-to c\k\, where c gives an upper bound for the spin-wave velocity. In the large-S limit, the upper bound c coincides with the result of the spin-wave theory.

引用

页码：2507 / 2510

页数：4