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arXiv · 2301.02502

Stacking-dependent topological magnons in bilayer CrI$_3$

M. Soenen·C. Bacaksiz·R. M. Menezes·M. V. Milosevic
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Abstract

Motivated by the potential of atomically-thin magnets towards tunable high-frequency magnonics, we detail the spin-wave dispersion of bilayer CrI$_3$. We demonstrate that the magnonic behavior of the bilayer strongly depends on its stacking configuration and the interlayer magnetic ordering, where a topological bandgap opens in the dispersion caused by the Dzyaloshinskii-Moriya and Kitaev interactions, classifying bilayer CrI$_3$ as a topological magnon insulator. We further reveal that both size and topology of the bandgap in a CrI$_3$ bilayer with an antiferromagnetic interlayer ordering are tunable by an external magnetic field.

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M. Soenen, C. Bacaksiz, R. M. Menezes, M. V. Milosevic. 2023-01-06. Stacking-dependent topological magnons in bilayer CrI$_3$. https://doi.org/10.1103/physrevmaterials.7.024421

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