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- W2227205540 abstract "We propose a kind of novel topological quantum state of semimetals in a quasi-one-dimensional (1D) crystals BaMX$_3$ (M = V, Nb or Ta; X = S or Se) family by using symmetry analysis and first principles calculation. We find that in BaVS$_3$ the valence and conduction bands are degenerate in the $k_z=pi/c$ plane ($c$ is the lattice constant along $hat{z}$ 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 two-fold rotation about the $hat{z}$ axis and a half-translation along the same $hat{z}$ axis. The band degeneracy in the node-surface is lifted in BaTaS$_3$ 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 $k_x$ = $pm{sqrt{3}}k_y$ on the $k_z=pi/c$ plane. These node-lines are robust against SOC and guaranteed by the symmetries of $P6_3/mmc$ 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." @default.
- W2227205540 created "2016-06-24" @default.
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- W2227205540 date "2016-02-18" @default.
- W2227205540 modified "2023-10-16" @default.
- W2227205540 title "Node-surface and node-line fermions from nonsymmorphic lattice symmetries" @default.
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- W2227205540 doi "https://doi.org/10.1103/physrevb.93.085427" @default.
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