Ground state fluctuations in rung-dimerised spin ladders

Details Ground state fluctuations in rung-dimerised spin ladders Ground state fluctuations in rung-dimerised spin ladders

2009-08-02

arxiv.org/abs/0908.0125v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages

Scientific paper

Treating an exactly rung-dimerized spin ladder as a reference model we study perturbatively zero temperature quantum fluctuations in spin ladders with slightly destroyed rung-dimerization. Analytic expressions are obtained for the gas parameter (density of rung-triplets) and the ground state energy per rung. At a strong diagonal frustration as well as at a rather strong antiferromagnetic rung coupling these results well agree with the previous numerical calculations.

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