文献类型：期刊文献

英文题名：Node-surface and node-line fermions from nonsymmorphic lattice symmetries

作者：Liang, Qi-Feng[1];Zhou, Jian[2];Yu, Rui[3];Wang, Zhi[4];Weng, Hongming[5,6,7]

机构：[1]Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China;[2]Nanjing Univ, Dept Mat, Nanjing 210093, Jiangsu, Peoples R China;[3]Harbin Inst Technol, Dept Phys, Harbin 150001, Peoples R China;[4]Sun Yat Sen Univ, Sch Phys & Engn, Guangzhou 510275, Guangdong, Peoples R China;[5]Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China;[6]Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China;[7]Collaborat Innovat Ctr Quantum Matter, Beijing 100190, Peoples R China

年份：2016

卷号：93

期号：8

外文期刊名：PHYSICAL REVIEW B

收录：SCI-EXPANDED(收录号：WOS:000370488300008)、、Scopus(收录号：2-s2.0-84960145694)、WOS

基金：The work is supported by the National Natural Science Foundation of China (NSFC) (Grants No.11574215, No. 11274359, and No. 11422428). Q.F.L acknowledges support from the Scientific Research Foundation for Returned Overseas Chinese Scholars, State Education Ministry of China. H.M.W. is supported by the National 973 program of China (Grants No. 2011CBA00108 and No. 2013CB921700), and the "Strategic Priority Research Program (B)" of the Chinese Academy of Sciences (Grant No. XDB07020100).

语种：英文

外文摘要：We propose a kind of topological quantum state of semimetals in the quasi-one-dimensional (1D) crystal family BaMX3 (M = V, Nb, or Ta; X = S or Se) by using symmetry analysis and first-principles calculation. We find that in BaVS3 the valence and conduction bands are degenerate in the k(z) = pi/c plane (c is the lattice constant along the (z) over cap axis) of the Brillouin zone (BZ). These nodal points form a node surface, and they are protected by a nonsymmorphic crystal symmetry consisting of a twofold rotation about the (z) over cap axis and a half-translation along the same (z) over cap axis. The band degeneracy in the node surface is lifted in BaTaS3 by including strong spin-orbit coupling (SOC) of Ta. The node surface is reduced into 1D node lines along the high-symmetry paths k(x) = 0 and k(x) = +/-root 3k(y) on the k(z) = pi/ c plane. These node lines are robust against SOC and guaranteed by the symmetries of the P6(3)/mmc space group. These node-line states are entirely different from previous proposals which are based on the accidental band touchings. We also propose a useful material design for realizing topological node-surface and node-line semimetals.