TY  - JOUR
AU  - Zhu, Fengfeng
AU  - Zhang, Lichuan
AU  - Wang, Xiao
AU  - Dos Santos, Flaviano José
AU  - Song, Junda
AU  - Mueller, Thomas
AU  - Schmalzl, Karin
AU  - Schmidt, Wolfgang F.
AU  - Ivanov, Alexandre
AU  - Park, Jitae T.
AU  - Xu, Jianhui
AU  - Ma, Jie
AU  - Lounis, Samir
AU  - Blügel, Stefan
AU  - Mokrousov, Yuriy
AU  - Su, Yixi
AU  - Brückel, Thomas
TI  - Topological magnon insulators in two-dimensional van der Waals ferromagnets CrSiTe3 and CrGeTe3 : Toward intrinsic gap-tunability
JO  - Science advances
VL  - 7
IS  - 37
SN  - 2375-2548
CY  - Washington, DC [u.a.]
PB  - Assoc.
M1  - FZJ-2021-03488
SP  - eabi7532
PY  - 2021
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - 34516772
UR  - <Go to ISI:>//WOS:000695713400030
DO  - DOI:10.1126/sciadv.abi7532
UR  - https://juser.fz-juelich.de/record/894929
ER  -