Topological Magnetic Excitations on the Distorted Kagome Antiferromagnets: Applications to Volborthite, Vesignieite, and Edwardsite

Abstract

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.

8 pages + supplemental material, 8 figures. Updated version with Chern number computation

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Cited by in corpus (19)

• Magnon thermal Hall effect in kagome antiferromagnets with Dzyaloshinskii-Moriya interactions
• Interaction-stabilized topological magnon insulator in ferromagnets
• Thermal Hall effect and topological edge states in a square lattice antiferromagnet
• Spin Thermal Hall Conductivity of a Kagomé Antiferromagnet
• Quantum Magnetism in Minerals
• Bulk and edge spin transport in topological magnon insulators
• Thermal Hall effects in quantum magnets
• Topological Phases in Magnonics
• Thermal Hall effect of magnons in collinear antiferromagnetic insulators: signatures of magnetic and topological phase transitions
• Floquet Topological Magnons
• Thermal Hall effect in square-lattice spin liquids: A Schwinger boson mean-field study
• Weyl magnons in noncoplanar stacked kagome antiferromagnets
• Vesignieite: a $S=\frac{1}{2}$ kagome antiferromagnet with dominant third-neighbor exchange
• Competing phases and topological excitations of spin-one pyrochlore antiferromagnets
• Crossover from Diffusive to Superfluid Transport in Frustrated Magnets
• Magnons in a two dimensional transverse field XXZ model
• Effects of Dzyaloshinskii-Moriya interactions in volborthite: Magnetic orders and thermal Hall effect
• Topological Aspects of Antiferromagnets
• Classification of magnon thermal Hall systems based on U(1) to non-Abelian gauge fields