Motivated by the potential of atomically-thin magnets towards tunable high-frequency magnonics, we detail the spin-wave dispersion of bilayer CrI3. 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 CrI3 as a topological magnon insulator. We further reveal that both size and topology of the bandgap in a CrI3 bilayer with an antiferromagnetic interlayer ordering are tunable by an external magnetic field.
Cite
@article{arxiv.2301.02502,
title = {Stacking-dependent topological magnons in bilayer CrI$_3$},
author = {M. Soenen and C. Bacaksiz and R. M. Menezes and M. V. Milosevic},
journal= {arXiv preprint arXiv:2301.02502},
year = {2023}
}