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Title: Edge states in antiferromagnetic quantum spin chains
Authors: Ng, Tai-Kai
Keywords: Edge states
Antiferromagnetic quantum spin chains
Spin quantum
Spin chains
Issue Date: Jul-1994
Citation: Physical review. B, v. 50, iss. 1, July 1994, p. 555-558
Abstract: The structure of edge states in general finite antiferromagnetic quantum spin chains with arbitrary spin value S is discussed in this letter within the framework of non-linear-sigma-model (NLσM) plus 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.
Rights: Physical Review, B © copyright (1994) American Physical Society. The Journal's web site is located at
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