%0 Journal Article
%A Niu, Chengwang
%A Buhl, Patrick
%A Bihlmayer, Gustav
%A Wortmann, Daniel
%A Blügel, Stefan
%A Mokrousov, Yuriy
%T Two-dimensional topological crystalline insulator phase in quantum wells of trivial insulators
%J 2D Materials
%V 3
%N 2
%@ 2053-1583
%C Bristol
%I IOP Publ.
%M FZJ-2016-04328
%P 025037
%D 2016
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000378571400057
%R 10.1088/2053-1583/3/2/025037
%U https://juser.fz-juelich.de/record/812032