Journal
NUCLEAR PHYSICS B
Volume 580, Issue 3, Pages 647-687Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0550-3213(00)00247-9
Keywords
fermions in reduced dimensions; lattice fermion models; quantized spin models
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We study the properties of the double-frequency sine-Gordon model in the vicinity of the Ising quantum phase transition displayed by this model. Using a mapping onto a generalized lattice quantum Ashkin-Teller model, we obtain critical and nearly-off-critical correlation functions of various operators. We discuss applications of the double-sine-Gordon model to one-dimensional physical systems, like spin chains in a staggered external field and interacting electrons in a staggered potential. (C) 2000 Elsevier Science B.V. All rights reserved.
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