Alternating spin chains with singlet ground states
统计力学
2009-10-30 v1
摘要
We investigate low-energy properties of the alternating spin chain model composed of spin and with a singlet ground state. After examining the spin-wave spectrum in detail, we map low-energy spin excitations to the O(3) non-linear sigma model in order to take into account quantum fluctuations. Analyzing the topological term in the resulting sigma model, we discuss how the massless or massive excitations are developed, especially according to the topological nature of the alternating spin system.
引用
@article{arxiv.cond-mat/9707148,
title = {Alternating spin chains with singlet ground states},
author = {T. Fukui and N. Kawakami},
journal= {arXiv preprint arXiv:cond-mat/9707148},
year = {2009}
}
备注
9 pages, revtex, to appear in PRB