Topological Magnon Bands and Unconventional Thermal Hall Effect on the Frustrated Honeycomb and Bilayer Triangular Lattice

Abstract

In the conventional ferromagnetic systems, topological magnon bands and thermal Hall effect are due to the Dzyaloshinskii-Moriya interaction (DMI). In principle, however, the DMI is either negligible or it is not allowed by symmetry in some quantum magnets. Therefore, we expect that topological magnon features will not be present in those systems. In addition, quantum magnets on the triangular-lattice are not expected to possess topological features as the DMI or spin-chirality cancels out due to equal and opposite contributions from adjacent triangles. Here, however, we predict that the isomorphic frustrated honeycomb-lattice and bilayer triangular-lattice antiferromagnetic system will exhibit topological magnon bands and topological thermal Hall effect in the absence of an intrinsic DMI. These unconventional topological magnon features are present as a result of magnetic-field-induced non-coplanar spin configurations with nonzero scalar spin chirality. The relevance of the results to realistic bilayer triangular antiferromagnetic materials are discussed.

arXiv comment7 pages, 8 figures. Final version to be published in J. Phys.: Condens. Mat

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• Bulk and edge spin transport in topological magnon insulators
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• Magnon topology and thermal Hall effect in trimerized triangular lattice antiferromagnet
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• Magnetoelectric Response of Antiferromagnetic Van der Waals Bilayers
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• Thermal Hall responses in frustrated honeycomb spin systems
• Intrinsic topological magnons in arrays of magnetic dipoles
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• Classification of magnon thermal Hall systems based on U(1) to non-Abelian gauge fields
• Topological edge states in dipolar zig-zag stripes
• Multiple topological phases of magnons induced by Dzyaloshinskii-Moriya and pseudodipolar anisotropic exchange interactions in Kagome ferromagnets