TY - JOUR
T1 - Topological insulators in ternary compounds with a honeycomb lattice
AU - Zhang, Hai Jun
AU - Chadov, Stanislav
AU - Müchler, Lukas
AU - Yan, Binghai
AU - Qi, Xiao Liang
AU - Kübler, Jürgen
AU - Zhang, Shou Cheng
AU - Felser, Claudia
N1 - DFG/ASPIMATT [1.2A]; Army Research Office [W911NF-09-10508]
PY - 2011/4/11
Y1 - 2011/4/11
N2 - We investigate a new class of ternary materials such as LiAuSe and KHgSb with a honeycomb structure in Au-Se and Hg-Sb layers. We demonstrate the band inversion in these materials similar to HgTe, which is a strong precondition for existence of the topological surface states. In contrast with graphene, these materials exhibit strong spin-orbit coupling and a small direct band gap at the Γ point. Since these materials are centrosymmetric, it is straightforward to determine the parity of their wave functions, and hence their topological character. Surprisingly, the compound with strong spin-orbit coupling (KHgSb) is trivial, whereas LiAuSe is found to be a topological insulator.
AB - We investigate a new class of ternary materials such as LiAuSe and KHgSb with a honeycomb structure in Au-Se and Hg-Sb layers. We demonstrate the band inversion in these materials similar to HgTe, which is a strong precondition for existence of the topological surface states. In contrast with graphene, these materials exhibit strong spin-orbit coupling and a small direct band gap at the Γ point. Since these materials are centrosymmetric, it is straightforward to determine the parity of their wave functions, and hence their topological character. Surprisingly, the compound with strong spin-orbit coupling (KHgSb) is trivial, whereas LiAuSe is found to be a topological insulator.
UR - http://www.scopus.com/inward/record.url?scp=79960631121&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.106.156402
DO - 10.1103/PhysRevLett.106.156402
M3 - مقالة
SN - 0031-9007
VL - 106
JO - Physical review letters
JF - Physical review letters
IS - 15
M1 - 156402
ER -