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The nontrivial electronic structure of Bi/Sb honeycombs on SiC(0001)
The nontrivial electronic structure of Bi/Sb honeycombs on SiC(0001)
- Source :
- New Journal of Physics, Vol 17, Iss 2, p 025005 (2015)
- Publication Year :
- 2015
- Publisher :
- IOP Publishing, 2015.
-
Abstract
- We discuss two-dimensional (2D) topological insulators (TIs) based on planar Bi/Sb honeycombs on a SiC(0001) substrate using first-principles computations. The Bi/Sb planar honeycombs on SiC(0001) are shown to support a nontrivial band gap as large as 0.56 eV, which harbors a Dirac cone lying within the band gap. Effects of hydrogen atoms placed on either just one side or on both sides of the planar honeycombs are examined. The hydrogenated honeycombs are found to exhibit topologically protected edge states for zigzag as well as armchair edges, with a wide band gap of 1.03 and 0.41 eV in bismuth and antimony films, respectively. Our findings pave the way for using planar bismuth and antimony honeycombs as potential new 2D-TI platforms for room-temperature applications.
Details
- Language :
- English
- ISSN :
- 13672630
- Volume :
- 17
- Issue :
- 2
- Database :
- Directory of Open Access Journals
- Journal :
- New Journal of Physics
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.7d78f34a1394437b85e6fdf4ebc08db5
- Document Type :
- article
- Full Text :
- https://doi.org/10.1088/1367-2630/17/2/025005