Topological magnetic excitations on the distorted kagomé antiferromagnets: Applications to volborthite, vesignieite, and edwardsite
Perimeter Institute for Theoretical Physics - 31 Caroline St. N., Waterloo, Ontario N2L 2Y5, Canada and African Institute for Mathematical Sciences - 6 Melrose Road, Muizenberg, Cape Town 7945, South Africa
Received: 6 December 2016
Accepted: 13 March 2017
In this letter, we identify a noncoplanar chiral spin texture on the distorted kagomé-lattice antiferromagnets induced by the presence of a magnetic field applied perpendicular to the distorted kagomé plane. The noncoplanar chiral spin texture has a nonzero scalar spin chirality similar to a chiral quantum spin liquid with broken time-reversal symmetry. In the noncoplanar regime we observe nontrivial topological magnetic excitations and thermal Hall response through the emergent field-induced scalar spin chirality in contrast to collinear ferromagnets in which the Dzyaloshinskii-Moriya (DM) spin-orbit interaction is the driving force. Our results shed light on recent observation of thermal Hall conductivity in distorted kagomé volborthite at nonzero magnetic field with no signal of DM spin-orbit interaction, and the results also apply to other distorted kagomé antiferromagnets such as vesignieite and edwardsite.
PACS: 75.10.Jm – Quantized spin models, including quantum spin frustration / 75.70.Tj – Spin-orbit effects / 75.30.Gw – Magnetic anisotropy
© EPLA, 2017