Nodal Line Spin-gapless Semimetals and High-quality Candidate Materials

Abstract

Spin-gapless semimetals (SGSMs), which generate 100\% spin polarization, are viewed as promising semi-half-metals in spintronics with high speed and low consumption. We propose and characterize a new ${\mathbb{Z}}_2$ class of topological nodal line (TNL) in SGSMs. The proposed TNLSGSMs are protected by space-time inversion symmetry or glide mirror symmetry with two-dimensional (2D) fully spin-polarized nearly flat surface states. Based on first-principles calculations and effective model analysis, a series of high-quality materials with $\text{R}\overline{3}\text{c}$ and $\text{R}3\text{c}$ space groups are predicted to realize such TNLSGSMs (chainlike). The 2D fully spin-polarized nearly flat surface states may provide a route to achieving equal spin pairing topological superconductivity as well as topological catalysts.

arXiv comment6 pages, 4 figures

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• Anisotropic non-linear optical response of nodal loop materials
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• Unique surface-state connection between Weyl and nodal ring fermions in ferromagnetic material Cs2MoCl6
• Two-dimensional Dirac semiconductor and its material realization
• Disorder- and Topology-Enhanced Fully Spin-Polarized Currents in Nodal Chain Spin-Gapless Semimetals
• Encyclopedia of emergent particles in three-dimensional crystals
• Collective modes in imbalanced nodal line semimetal
• Quasi-nodal lines in rhombohedral magnetic materials
• Robust large-gap topological insulator phase in transition-metal chalcogenide ZrTe${}_4$Se