Quantitative expression of the spin gap via bosonization for a dimerized spin-1/2 chain

E. Orignac ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2004, vol. 39, issue 3, 335-339

Abstract: Using results on the mass gap in the sine-Gordon model combined with the exact amplitudes in the bosonized representation of the Heisenberg spin-1/2 chain and one-loop renormalization group, we derive a quantitative expression for the gap in a dimerized spin-1/2 chain. This expression is shown to be in good agreement with recent numerical estimates when a marginally irrelevant perturbation is taken into account. Copyright Springer-Verlag Berlin/Heidelberg 2004

Date: 2004
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DOI: 10.1140/epjb/e2004-00198-5

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