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arXiv · 1701.01243

Chiral spin liquid on kagome antiferromagnet induced by Dzyaloshinskii-Moriya interaction

Laura Messio·Samuel Bieri·Claire Lhuillier·Bernard Bernu
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Abstract

The quantum spin liquid material herbertsmithite is described by an antiferromagnetic Heisenberg model on the kagome lattice with non-negligible Dzyaloshinskii-Moriya interaction~(DMI). A well established phase transition to the $\mathbf q=0$ long-range order occurs in this model when the DMI strength increases, but the precise nature of a small-DMI phase remains controversial. Here, we describe a new phase obtained from Schwinger-boson mean-field theory that is stable at small DMI, and which can explain the dispersionless spectrum seen in inelastic neutron scattering experiment by Han et al (Nature (London) 492, 406 (2012)}). It is a time-reversal symmetry breaking $\mathbb Z_2$ spin liquid, with the unique property of a small and constant spin gap in an extended region of the Brillouin zone. The phase diagram as a function of DMI and spin size is given, and dynamical spin structure factors are presented.

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Laura Messio, Samuel Bieri, Claire Lhuillier, Bernard Bernu. 2017-01-05. Chiral spin liquid on kagome antiferromagnet induced by Dzyaloshinskii-Moriya interaction. https://doi.org/10.1103/physrevlett.118.267201

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