Abstract
The appearance of topologically protected states at the surface of an ordinary insulator is a rare occurrence and to date only a handful of materials are known for having this property. An intriguing question concerns the possibility of forming topologically protected interfaces between different materials. Here we propose that a topological phase can be transferred to graphene by proximity with the three-dimensional topological insulator . By using density functional and transport theory, we prove that, at the verge of the chemical bond formation, a hybrid state forms at the graphene/ interface. The state has Dirac-cone-like dispersion at the point and a well defined helical spin texture, indicating its topologically protected nature. This demonstrates that proximity can transfer the topological phase from to graphene.
- Received 19 August 2013
- Revised 30 June 2014
DOI:https://doi.org/10.1103/PhysRevB.90.035418
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