Einstein-de Haas Effect of Topological Magnons

Abstract

We predict the existence of Einstein-de Haas effect in topological magnon insulators. Temperature variation of angular momentum in the topological state shows a sign change behavior, akin to the low temperature thermal Hall conductance response. This manifests itself as a macroscopic mechanical rotation of the material hosting topological magnons. We show that an experimentally observable Einstein-de Haas effect can be measured in the square-octagon, the kagome, and the honeycomb lattices. Albeit, the effect is the strongest in the square-octagon lattice. We treat both the low and the high temperature phases using spin wave and Schwinger boson theory, respectively. We propose an experimental set up to detect our theoretical predictions. We suggest candidate square-octagon materials where our theory can be tested.

15 pages, 10 figures

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Cited by in corpus (6)

• Topological magnons on the triangular kagome lattice
• Type-II Dirac points and Dirac nodal loops on the magnons of square-hexagon-octagon lattice
• Einstein-de Haas effect: a bridge linking mechanics, magnetism, and topology
• A spin-rotation mechanism of Einstein-de Haas effect based on a ferromagnetic disk
• Chiral Magnons: Mechanisms and Research Progress
• Topological properties of multilayer magnon insulators