RVB description of the low-energy singlets of the spin 1/2 kagome antiferromagnet

Details RVB description of the low-energy singlets of the spin 1/2 kagome antiferromagnet RVB description of the low-energy singlets of the spin 1/2 kagome antiferromagnet

2000-03-06

arxiv.org/abs/cond-mat/0003080v1

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 13 figures, 3 tables. Submitted to EPJB

Scientific paper

10.1007/PL00011071

{Extensive calculations in the short-range RVB (Resonating valence bond) subspace on both the trimerized and the regular (non-trimerized) Heisenberg model on the kagome lattice show that short-range dimer singlets capture the specific low-energy features of both models. In the trimerized case the singlet spectrum splits into bands in which the average number of dimers lying on one type of bonds is fixed. These results are in good agreement with the mean field solution of an effective model recently introduced. For the regular model one gets a continuous, gapless spectrum, in qualitative agreement with exact diagonalization results.

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