Journal Article

FZJ-2021-03488

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Topological magnon insulators in two-dimensional van der Waals ferromagnets CrSiTe3 and CrGeTe3 : Toward intrinsic gap-tunability

Zhu, F. (Corresponding author)FZJ* ; Zhang, L.FZJ* ; Wang, X.FZJ* ; Dos Santos, F. J.FZJ* ; Song, J.FZJ* ; Mueller, T.FZJ* ; Schmalzl, K.FZJ* ; Schmidt, W. F.FZJ* ; Ivanov, A. ; Park, J. T. ; Xu, J. ; Ma, J. ; Lounis, S.FZJ* ; Blügel, S.FZJ* ; Mokrousov, Y. (Corresponding author)FZJ* ; Su, Y. (Corresponding author)FZJ* ; Brückel, T.FZJ*

2021
Assoc. Washington, DC [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/28679  doi:10.1126/sciadv.abi7532

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.

Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd) ; Condensed Matter Physics (2nd)

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IAS-1)
2. Quanten-Theorie der Materialien (PGI-1)
3. JARA-FIT (JARA-FIT)
4. JARA - HPC (JARA-HPC)
5. JCNS-FRM-II (JCNS-FRM-II)
6. JCNS-ILL (JCNS-ILL)
7. Streumethoden (JCNS-2)
8. JCNS-4 (JCNS-4)
9. Heinz Maier-Leibnitz Zentrum (MLZ)

Research Program(s):

1. 5211 - Topological Matter (POF4-521) (POF4-521)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)
3. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

1. DNS: Diffuse scattering neutron time of flight spectrometer (NL6S)
2. ILL-IN12: Cold neutron 3-axis spectrometer
3. PUMA: Thermal three axes spectrometer (SR7)

Appears in the scientific report 2021

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