Abstract
With the use of ab initio calculations, the topological phase diagrams of bulk and monolayer are established. Whereas bulk shows two strong topological phases [1;(000)] and [1;(001)] for and , respectively, the monolayer is topologically nontrivial for . Because in the latter doping range the topologically nontrivial nature survives down to a monolayer, is a unique system for studying topological phases in three and two dimensions simultaneously.
- Received 16 May 2012
DOI:https://doi.org/10.1103/PhysRevLett.110.077202
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