MODIFIED SPIN-WAVE THEORY FOR THE FRUSTRATED HEISENBERG ANTIFERROMAGNET ON A SQUARE LATTICE

被引：5
|
作者：
Wu, You [1 ]
Chen, Yuan [1 ]
机构：
[1] Guangzhou Univ, Coll Phys & Elect Engn, Dept Phys, Guangzhou 510006, Guangdong, Peoples R China
来源：
INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 2013年 / 27卷 / 11期
基金：
中国国家自然科学基金;
关键词：
Heisenberg antiferromagnet; modified spin-wave theory; frustration; MAGNON DISPERSION; SERIES;
D O I：
10.1142/S0217979213500215
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The effects of quantum fluctuations due to frustration between nearest neighbors and next-nearest neighbors of the quantum spin-half Heisenberg antiferromagnet on a square lattice are investigated by using the modified spin-wave theory (MSW). We have extended Takahashi's MSW theory, and studied the ground-state and finite-temperature properties of this model. The results calculated within this formalism on the thermodynamics agree quite well with the quantum Monte Carlo estimates, and exact diagonalization results. We have also compared the present method with the conventional spin wave theory.
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页数：16
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