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001     873882
005     20210315194458.0
024 7 _ |a 10.1103/PhysRevLett.124.066401
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100 1 _ |a Niu, Chengwang
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245 _ _ |a Antiferromagnetic Topological Insulator with Nonsymmorphic Protection in Two Dimensions
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520 _ _ |a 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.
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536 _ _ |a Topological transport in real materials from ab initio (jiff40_20190501)
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700 1 _ |a Mao, Ning
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700 1 _ |a Huang, Baibiao
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700 1 _ |a Mokrousov, Yuriy
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700 1 _ |a Dai, Ying
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773 _ _ |a 10.1103/PhysRevLett.124.066401
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856 4 _ |u https://juser.fz-juelich.de/record/873882/files/AFM_Mn_0118.pdf
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