Quantum phase transition induced by Dzyaloshinskii-Moriya interactions in the kagome antiferromagnet
Résumé
We argue that the S=1/2 kagome antiferromagnet undergoes a quantum phase transition when the Dzyaloshinskii-Moriya coupling is increased. For DDc the system develops antiferromagnetic long-range order. The quantum critical point is found to be Dc≃0.1J using exact diagonalizations and finite-size scaling. This suggests that the kagome compound ZnCu3(OH)6Cl3 may be in a quantum critical region controlled by this fixed point.
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