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

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

2004-03-05

arxiv.org/abs/cond-mat/0403175v1

Eur. Phys. J. B 39, 335 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 2 EPS figures, uses svjour.cls

Scientific paper

10.1140/epjb/e2004-00198-5

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.

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