Proximity-induced topological state in graphene
Citation:
I. Popov, M. Mantega, A. Narayan, and S. Sanvito, Proximity-induced topological state in graphene, Physical Review B, 90, 2014, 035418-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 Bi2Se3. 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/Bi2Se3 interface. The state has Dirac-cone-like dispersion at the Γ point and a well defined helical spin texture, indicating its topologically protected nature. This demonstrates that proximity can transfer the topological phase from Bi2Se3 to graphene.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
08/CE/I1432
Author's Homepage:
http://people.tcd.ie/sanvitosDescription:
PUBLISHED
Author: SANVITO, STEFANO
Sponsor:
Science Foundation Ireland (SFI)Type of material:
Journal ArticleCollections
Series/Report no:
Physical Review B90
Availability:
Full text availableKeywords:
Topological insulators (TIs)Subject (TCD):
Nanoscience & MaterialsDOI:
http://dx.doi.org/10.1103/PhysRevB.90.035418Metadata
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