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.
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