Topological magnon insulators in two-dimensional van der Waals ferromagnets CrSiTe3 and CrGeTe3: Toward intrinsic gap-tunability
Zhu F, Zhang L, Wang X, Dos Santos FJ, Song J, Mueller T, Schmalzl K, Schmidt WF, Ivanov A, Park JT, Xu J, Ma J, Lounis S, Bluegel S, Mokrousov Y, Su Y, Brueckel T (2021)
Publication Type: Journal article
Publication year: 2021
Journal
Book Volume: 7
Article Number: abi7532
Journal Issue: 37
Abstract
The bosonic analogs of topological insulators have been proposed in numerous theoretical works, but their experimental realization is still very rare, especially for spin systems. Recently, two-dimensional (2D) honeycomb van der Waals ferromagnets have emerged as a new platform for topological spin excitations. Here, via a comprehensive inelastic neutron scattering study and theoretical analysis of the spin-wave excitations, we report the realization of topological magnon insulators in CrXTe3 (X = Si, Ge) compounds. The nontrivial nature and intrinsic tunability of the gap opening at the magnon band-crossing Dirac points are confirmed, while the emergence of the corresponding in-gap topological edge states is demonstrated theoretically. The realization of topological magnon insulators with intrinsic gap-unability in this class of remarkable 2D materials will undoubtedly lead to new and fascinating technological applications in the domain of magnonics and topological spintronics.
Involved external institutions
Forschungszentrum Jülich / Research Centre Jülich (FZJ)
Germany (DE)
Institute Laue-Langevin (ILL)
France (FR)
Technische Universität München (TUM)
Germany (DE)
Shanghai Jiao Tong University / 上海交通大学
China (CN)
Germany (DE)
Institute Laue-Langevin (ILL)
France (FR)
Technische Universität München (TUM)
Germany (DE)
Shanghai Jiao Tong University / 上海交通大学
China (CN)
How to cite
APA:
Zhu, F., Zhang, L., Wang, X., Dos Santos, F.J., Song, J., Mueller, T.,... Brueckel, T. (2021). Topological magnon insulators in two-dimensional van der Waals ferromagnets CrSiTe3 and CrGeTe3: Toward intrinsic gap-tunability. Science Advances, 7(37). https://doi.org/10.1126/sciadv.abi7532
MLA:
Zhu, Fengfeng, et al. "Topological magnon insulators in two-dimensional van der Waals ferromagnets CrSiTe3 and CrGeTe3: Toward intrinsic gap-tunability." Science Advances 7.37 (2021).
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