TY  - JOUR
AU  - Niu, Chengwang
AU  - Mao, Ning
AU  - Huang, Baibiao
AU  - Mokrousov, Yuriy
AU  - Dai, Ying
TI  - Antiferromagnetic Topological Insulator with Nonsymmorphic Protection in Two Dimensions
JO  - Physical review letters
VL  - 124
IS  - 6
SN  - 1079-7114
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2020-01072
SP  - 066401
PY  - 2020
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:32109083
UR  - <Go to ISI:>//WOS:000513240600008
DO  - DOI:10.1103/PhysRevLett.124.066401
UR  - https://juser.fz-juelich.de/record/873882
ER  -