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(TC)and strong robustness to spin-o...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(TC)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 Mn_(2)N_(3)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 pointΓ.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 TCof the 2D Mn_(2)N_(3)reaches 530 K,well above the room temperature.Notably,the 2D Mn_(2)N_(3)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.展开更多
基金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)National Natural Science Foundation of China(Grant Nos.52173283 and 62071200)
文摘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(TC)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 Mn_(2)N_(3)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 pointΓ.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 TCof the 2D Mn_(2)N_(3)reaches 530 K,well above the room temperature.Notably,the 2D Mn_(2)N_(3)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.
