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Antiferromagnetic Topological Insulator with Nonsymmorphic Protection in Two Dimensions
- Source :
- Physical review letters 124(6), 066401 (2020). doi:10.1103/PhysRevLett.124.066401
- Publication Year :
- 2020
- Publisher :
- American Physical Society (APS), 2020.
-
Abstract
- 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 $X\mathrm{Mn}Y$ ($X=\mathrm{Sr}$ and Ba, $Y=\mathrm{Sn}$ 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.
- Subjects :
- Physics
Spintronics
Condensed matter physics
Band gap
General Physics and Astronomy
Charge (physics)
01 natural sciences
Symmetry (physics)
Gapless playback
Topological insulator
0103 physical sciences
Antiferromagnetism
ddc:530
Condensed Matter::Strongly Correlated Electrons
010306 general physics
Spin-½
Subjects
Details
- ISSN :
- 10797114 and 00319007
- Volume :
- 124
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters
- Accession number :
- edsair.doi.dedup.....77977ed3add1477da1595343a718849c