Stacking-dependent topological magnons in bilayer CrI${}_3$

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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Cited by in corpus (7)

• Tunable magnon topology in monolayer CrI${}_3$ under external stimuli
• Topological magnon gap engineering in van der Waals CrI${}_3$ ferromagnets
• Strain-tunable magnetic and magnonic states in Ni-dihalide monolayers
• Intrinsic Spin Nernst Effect and Chiral Edge Modes in van der Waals Ferromagnetic Insulators: Dzyaloshinskii-Moriya vs. Kitaev Interactions
• Angular-Dependent Thermal Hall Effect in a Honeycomb Magnet: Disentangling Kitaev and Dzyaloshinskii-Moriya Interactions
• Strong photon coupling to high-frequency antiferromagnetic magnons via topological surface states
• Stacking-dependent magnetic ordering in bilayer ScI${}_2$