Nodal Line Spin-Gapless Semimetals and High-Quality Candidate Materials

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 Z_{2} class of topological nodal line (TNL) in SGSMs. The proposed TNLSGSMs are protected by space-ti...

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Bibliographic Details
Published in:Physical review letters 2020-01, Vol.124 (1), p.016402
Main Authors: Zhang, Run-Wu, Zhang, Zeying, Liu, Cheng-Cheng, Yao, Yugui
Format: Article
Language:English
Subjects:
First principles
Flat surfaces
Materials selection
Metalloids
Polarization (spin alignment)
Spintronics
Superconductivity
Symmetry
Topology
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Summary: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 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 R3[over ¯]c and R3c 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.124.016402