Low Energy Singlets in the Heisenberg Kagome Antiferromagnet

Details Low Energy Singlets in the Heisenberg Kagome Antiferromagnet Low Energy Singlets in the Heisenberg Kagome Antiferromagnet

2004-06-25

arxiv.org/abs/cond-mat/0406651v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages

Scientific paper

The spin half Heisenberg antiferromagnet on the Kagome lattice, is mapped by Contractor Renormalization to a Spin-Pseudospin Hamiltonian on the triangular superlattice. Variationally, we find a ground state with columnar dimer order. Dimer orientation fluctuations are described by an effective O(2) model at energies above an exponentially suppressed clock mass scale. Our results explain the large density of low energy singlets observed numerically, and the non magnetic T-squared specific heat observed experimentally.

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