TY - JOUR
T1 - Weak topological insulators induced by the interlayer coupling
T2 - A first-principles study of stacked Bi 2 TeI
AU - Tang, Peizhe
AU - Yan, Binghai
AU - Cao, Wendong
AU - Wu, Shu Chun
AU - Felser, Claudia
AU - Duan, Wenhui
PY - 2014/1/27
Y1 - 2014/1/27
N2 - Based on first-principles calculations, we predict Bi2TeI, a stoichiometric compound that is synthesized, to be a weak topological insulator (TI) in layered subvalent bismuth telluroiodides. Within a bulk energy gap of 80 meV, two Dirac-cone-like topological surface states exist on the side surface perpendicular to the BiTeI layer plane. These Dirac cones are relatively isotropic due to the strong interlayer coupling, distinguished from those of previously reported weak TI candidates. Moreover, with chemically stable cladding layers, the BiTeI-Bi2-BiTeI sandwiched structure is a robust quantum spin Hall system, which can be obtained by simply cleaving the bulk Bi2TeI.
AB - Based on first-principles calculations, we predict Bi2TeI, a stoichiometric compound that is synthesized, to be a weak topological insulator (TI) in layered subvalent bismuth telluroiodides. Within a bulk energy gap of 80 meV, two Dirac-cone-like topological surface states exist on the side surface perpendicular to the BiTeI layer plane. These Dirac cones are relatively isotropic due to the strong interlayer coupling, distinguished from those of previously reported weak TI candidates. Moreover, with chemically stable cladding layers, the BiTeI-Bi2-BiTeI sandwiched structure is a robust quantum spin Hall system, which can be obtained by simply cleaving the bulk Bi2TeI.
UR - http://www.scopus.com/inward/record.url?scp=84894646865&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84894646865&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.89.041409
DO - 10.1103/PhysRevB.89.041409
M3 - Article
AN - SCOPUS:84894646865
SN - 1098-0121
VL - 89
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 4
M1 - 041409
ER -