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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)

Authors :
Chia-Hsiu Hsu
Zhi-Quan Huang
Feng-Chuan Chuang
Chien-Cheng Kuo
Yu-Tzu Liu
Hsin Lin
Arun Bansil
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