文献类型：期刊文献

英文题名：Topological states of non-Dirac electrons on a triangular lattice

作者：Liang, Qi-Feng[1,2];Yu, Rui[2];Zhou, Jian[3];Hu, Xiao[2]

机构：[1]Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China;[2]Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton WPI MANA, Tsukuba, Ibaraki 3050044, Japan;[3]Nanjing Univ, Dept Mat Sci, Nanjing 210093, Jiangsu, Peoples R China

年份：2016

卷号：93

期号：3

外文期刊名：PHYSICAL REVIEW B

收录：SCI-EXPANDED(收录号：WOS:000369220100004)、、Scopus(收录号：2-s2.0-85000838197)、WOS

基金：The authors are grateful to T. Uchihashi and T. Kawakami for stimulating discussions. This work was supported by WPI Initiative on Materials Nanoarchitectonics, Ministry of Education, Culture, Sports, Science and Technology in Japan. Q.F.L acknowledges the support from the National Natural Foundation of China (NFSC) No. 11574215 and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry of China.

语种：英文

外文摘要：We demonstrate possible nontrivial topology of non-Dirac electrons. In particular we show that, because of the C-3 crystal symmetry and time-reversal symmetry, multiple p orbitals accommodated on a triangular lattice exhibit a degeneracy and quadratic non-Dirac band dispersions at the Gamma point. When the atomic spin-orbit coupling (SOC) is taken into account, a quantum spin Hall effect state is realized. As revealed explicitly by a k . p model, the nontrivial topology is associated with a meron structure with double vorticity in the pseudospin texture, a mechanism different from that on honeycomb lattice and the band inversion. One possible realization of this scheme is the Si[111] surface adapted by heavy elements with strong atomic SOC, with symmetry and orbitals selected by choosing coverage and auxiliary elements. In terms of first-principles calculations on 1/3 regular coverage of Bi a topological gap of similar to 0.15 eV is derived.