Quantum phase transition induced by Dzyaloshinskii-Moriya in the kagome antiferromagnet

Details Quantum phase transition induced by Dzyaloshinskii-Moriya in the kagome antiferromagnet Quantum phase transition induced by Dzyaloshinskii-Moriya in the kagome antiferromagnet

2008-06-02

arxiv.org/abs/0806.0393v2

Phys. Rev. B 78, 140405(R) (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures; v2: add. data included, show that D=0.1J is at a quantum critical point

Scientific paper

10.1103/PhysRevB.78.140405

We argue that the S=1/2 kagome antiferromagnet undergoes a quantum phase transition when the Dzyaloshinskii-Moriya coupling is increased. For $DD_c$ the system develops antiferromagnetic long-range order. The quantum critical point is found to be $D_c \simeq 0.1J$ using exact diagonalizations and finite-size scaling. This suggests that the kagome compound ZnCu$_3(OH)$_6$Cl$_3$ may be in a quantum critical region controlled by this fixed point.

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