Low-energy sector of the S=1/2 Kagome antiferromagnet

Details Low-energy sector of the S=1/2 Kagome antiferromagnet Low-energy sector of the S=1/2 Kagome antiferromagnet

1998-05-07

arxiv.org/abs/cond-mat/9805078v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages including 3 figures

Scientific paper

10.1103/PhysRevLett.81.2356

Starting from a modified version of the the S=1/2 Kagome antiferromagnet to emphasize the role of elementary triangles, an effective Hamiltonian involving spin and chirality variables is derived. A mean-field decoupling that retains the quantum nature of these variables is shown to yield a Hamiltonian that can be solved exactly, leading to the following predictions: i) The number of low lying singlet states increase with the number of sites N like 1.15 to the power N; ii) A singlet-triplet gap remains in the thermodynamic limit; iii) Spinons form boundstates with a small binding energy. By comparing these properties with those of the regular Kagome lattice as revealed by numerical experiments, we argue that this description captures the essential low energy physics of that model.

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