Abstract The search for two-dimensional (2D) nodal ring semimetallic materials is a current research hotspot in spintronics, and designing a 2D nodal ring (NR) material with high Curie temperature ( and strong robustness to spin-orbit coupling (SOC) is an even greater challenge. Here, based on the first-principles calculations and symmetry analysis, we predict that 2D MnN is a nodal ring semimetal (NRSM) with three energy bands near the Fermi energy level consisting of electrons in the same spin channel. An electron-like energy band and two hole-like energy bands near the Fermi plane cross to form two NRs centered at the point . Symmetry analysis shows that the spin-polarized NR semimetal is robust to SOC due to the conservation of horizontal mirror symmetry. Monte-Carlo simulations further demonstrate that the of the 2D MnN reaches 530 K, well above the room temperature. Notably, the 2D MnN remains an NRSM on h-BN substrate. Our results not only reveal a general framework for designing 2D NR materials, but also promote further research in the direction of multifunctional quantum devices for spintronics.
(Relativistic corrections, spin-orbit effects, fine structure; hyperfine structure)
Fund: Project supported by Taishan Scholar Program of Shandong Province, China (Grant No. ts20190939), Independent Cultivation Program of Innovation Team of Jinan City (Grant No. 2021GXRC043), and National Natural Science Foundation of China (Grant Nos. 52173283 and 62071200).
Xin-Ke Liu(刘鑫柯), Xin-Yang Li(李欣阳), Miao-Juan Ren(任妙娟),Pei-Ji Wang(王培吉), and Chang-Wen Zhang(张昌文) High-temperature nodal ring semimetal in two-dimensional honeycomb-kagome Mn2N3 lattice 2022 Chin. Phys. B 31 127203
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A new direct band gap silicon allotrope o-Si32 Xin-Chao Yang(杨鑫超), Qun Wei(魏群), Mei-Guang Zhang(张美光), Ming-Wei Hu(胡明玮), Lin-Qian Li(李林茜), and Xuan-Min Zhu(朱轩民). Chin. Phys. B, 2022, 31(2): 026104.
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