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Edge states in antiferromagnetic quantum spin chains

Authors Tai-Kai Ng
Issue Date 1994
Source Physical Review B, v. 50, (1), July 1994
Summary The structure of edge states in general finite antiferromagnetic quantum spin chains with arbitrary spin value S is discussed within the framework of the nonlinear-sigma model (NLσM) plus a topological θ term. Based on a large-N theory of SU(N) quantum antiferromagnets and strong-coupling expansion, we argue that edge states with fractionalized spin quantum number S’ exist in all spin chains with S≥1, with S’=S/2 for integer spin chains and S’=(S-1/2)/2 for half-integer spin chains.
ISSN 1098-0121
Rights © 1994 American Physical Society
Language English
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