%0 Journal Article
%A Zhu, Fengfeng
%A Zhang, Lichuan
%A Wang, Xiao
%A Dos Santos, Flaviano José
%A Song, Junda
%A Mueller, Thomas
%A Schmalzl, Karin
%A Schmidt, Wolfgang F.
%A Ivanov, Alexandre
%A Park, Jitae T.
%A Xu, Jianhui
%A Ma, Jie
%A Lounis, Samir
%A Blügel, Stefan
%A Mokrousov, Yuriy
%A Su, Yixi
%A Brückel, Thomas
%T Topological magnon insulators in two-dimensional van der Waals ferromagnets CrSiTe3 and CrGeTe3 : Toward intrinsic gap-tunability
%J Science advances
%V 7
%N 37
%@ 2375-2548
%C Washington, DC [u.a.]
%I Assoc.
%M FZJ-2021-03488
%P eabi7532
%D 2021
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ 34516772
%U <Go to ISI:>//WOS:000695713400030
%R 10.1126/sciadv.abi7532
%U https://juser.fz-juelich.de/record/894929