TY - JOUR
T1 - Symmetry-constrained reorganization of Dirac cones in topological insulators by surface modification
AU - Bian, Guang
AU - Wang, Xiaoxiong
AU - Liu, Yang
AU - Miller, T.
AU - Chiang, T. C.
PY - 2011/12/1
Y1 - 2011/12/1
N2 - Topological insulators possess a symmetry-protected surface spin current, a property highly relevant to spintronics applications. This current arises from gapless spin-polarized surface states. Calculations show that these states can undergo drastic transformations with surface treatment, despite the overall symmetry-based constraints. Specifically, the single Dirac cone at the zone center for the surface states in Bi 2Se 3 (Bi 2Te 3) is transformed, upon hydrogen termination, into three Dirac cones at the zone boundary. This trifurcation enhances the surface spin polarization, but leaves the overall topological order invariant.
AB - Topological insulators possess a symmetry-protected surface spin current, a property highly relevant to spintronics applications. This current arises from gapless spin-polarized surface states. Calculations show that these states can undergo drastic transformations with surface treatment, despite the overall symmetry-based constraints. Specifically, the single Dirac cone at the zone center for the surface states in Bi 2Se 3 (Bi 2Te 3) is transformed, upon hydrogen termination, into three Dirac cones at the zone boundary. This trifurcation enhances the surface spin polarization, but leaves the overall topological order invariant.
UR - http://www.scopus.com/inward/record.url?scp=84855410288&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.84.235414
DO - 10.1103/PhysRevB.84.235414
M3 - Article
AN - SCOPUS:84855410288
SN - 1098-0121
VL - 84
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 23
M1 - 235414
ER -