%0 Journal Article
%A Niu, Chengwang
%A Mao, Ning
%A Huang, Baibiao
%A Mokrousov, Yuriy
%A Dai, Ying
%T Antiferromagnetic Topological Insulator with Nonsymmorphic Protection in Two Dimensions
%J Physical review letters
%V 124
%N 6
%@ 1079-7114
%C College Park, Md.
%I APS
%M FZJ-2020-01072
%P 066401
%D 2020
%X The recent demonstration of topological states in antiferromagnets (AFMs) provides an exciting platform for exploring prominent physical phenomena and applications of antiferromagnetic spintronics. A famous example is the AFM topological insulator (TI) state, which, however, was still not observed in two dimensions. Using a tight-binding model and first-principles calculations, we show that, in contrast to previously observed AFM topological insulators in three dimensions, an AFM TI can emerge in two dimensions as a result of a nonsymmorphic symmetry that combines the twofold rotation symmetry and half-lattice translation. Based on the spin Chern number, Wannier charge centers, and gapless edge states analysis, we identify intrinsic AFM XMnY (X=Sr and Ba, Y=Sn and Pb) quintuple layers as experimentally feasible examples of predicted topological states with a stable crystal structure and giant magnitude of the nontrivial band gaps, reaching as much as 186 meV for SrMnPb, thereby promoting these systems as promising candidates for innovative spintronics applications.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:32109083
%U <Go to ISI:>//WOS:000513240600008
%R 10.1103/PhysRevLett.124.066401
%U https://juser.fz-juelich.de/record/873882