TY  - JOUR
AU  - Niu, Chengwang
AU  - Buhl, Patrick
AU  - Bihlmayer, Gustav
AU  - Wortmann, Daniel
AU  - Blügel, Stefan
AU  - Mokrousov, Yuriy
TI  - Two-dimensional topological crystalline insulator phase in quantum wells of trivial insulators
JO  - 2D Materials
VL  - 3
IS  - 2
SN  - 2053-1583
CY  - Bristol
PB  - IOP Publ.
M1  - FZJ-2016-04328
SP  - 025037
PY  - 2016
AB  - The realization of two-dimensional (2D) topological insulators (TIs) in HgTe/CdTe quantum wells (QWs) has generated an explosion of research on TIs and novel topologically nontrivial phases. Here we predict, based on first-principles calculations, that the newly discovered 2D topological crystalline insulators (TCIs) phase exists even in the QWs of trivial insulators, e.g. (Sn/Pb)Te and Na(Cl/Br), with mirror Chern number ${n}_{{\rm{M}}}=-2$. Tunable nontrivial energy gaps ranging from 4 to 238 meV are obtained, guaranteeing further room-temperature observations and applications. The combined effect of strain and electrostatic interaction that can be engineered by the cladding layers leads to a band inversion, resulting in the phase transition from trivial insulator to 2D TCIs. Our work provides a new strategy for engineering topological states in 2D materials.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000378571400057
DO  - DOI:10.1088/2053-1583/3/2/025037
UR  - https://juser.fz-juelich.de/record/812032
ER  -