Flat spin wave dispersion in a triangular antiferromagnet
强关联电子
2007-05-23 v2 统计力学
摘要
The excitation spectrum of a S=1/2 2D triangular quantum antiferromagnet is studied using 1/S expansion. Due to the non-collinearity of the classical ground state significant and non-trivial corrections to the spin wave spectrum appear already in the first order in 1/S in contrast to the square lattice antiferromagnet. The resulting magnon dispersion is almost flat in a substantial portion of the Brillouin zone. Our results are in quantitative agreement with recent series expansion studies by Zheng, Fjaerestad, Singh, McKenzie, and Coldea [PRL 96, 057201 (2006) and cond-mat/0608008].
关键词
引用
@article{arxiv.cond-mat/0608002,
title = {Flat spin wave dispersion in a triangular antiferromagnet},
author = {Oleg A. Starykh and Andrey V. Chubukov and Alexander G. Abanov},
journal= {arXiv preprint arXiv:cond-mat/0608002},
year = {2007}
}
备注
4.1 pages, 13 figures; v2 - as published, references updated