Excitation gap of an antiferromagnetic Heisenberg chain with multiple decorations

H Asakawa

Physica A: Statistical Mechanics and its Applications, 2000, vol. 286, issue 1, 181-188

Abstract: A one-dimensional spin-12 antiferromagnetic Heisenberg model with multiple decorations is introduced. The low-lying properties of the decorated quantum spin chain are discussed. In the continuum and semiclassical limit of the present model, the non-linear sigma model with a topological term is derived and the conjecture for the low-lying state is proposed. Validity of the conjecture seems to be supported by the perturbational expansions and by the density matrix renormalization group calculations.

Keywords: Quantum spin chain; Heisenberg model (search for similar items in EconPapers)
Date: 2000
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:286:y:2000:i:1:p:181-188

DOI: 10.1016/S0378-4371(00)00189-8

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