TY  - JOUR
AU  - Niu, Chengwang
AU  - Buhl, Patrick
AU  - Bihlmayer, Gustav
AU  - Wortmann, Daniel
AU  - Blügel, Stefan
AU  - Mokrousov, Yuriy
TI  - Topological crystalline insulator and quantum anomalous Hall states in IV-VI-based monolayers and their quantum wells
JO  - Physical review / B
VL  - 91
IS  - 20
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2015-03083
SP  - 201401
PY  - 2015
AB  - Different from the two-dimensional (2D) topological insulator, the 2D topological crystalline insulator (TCI) phase disappears when the mirror symmetry is broken, e.g., upon placing on a substrate. Here, based on a new family of 2D TCIs—SnTe and PbTe monolayers—we theoretically predict the realization of the quantum anomalous Hall effect with a Chern number C=2 even when the mirror symmetry is broken. Remarkably, we also demonstrate that the considered materials retain their large-gap topological properties in quantum well structures obtained by sandwiching the monolayers between NaCl layers. Our results demonstrate that the TCIs can serve as a seed for observing robust topologically nontrivial phases.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000353880100001
DO  - DOI:10.1103/PhysRevB.91.201401
UR  - https://juser.fz-juelich.de/record/190152
ER  -