【摘 要】
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The two-dimensional(2D)materials with nodal line band crossing have been attracting great research interest.How-ever,it remains a challenge to find high-stable nodal line structure in 2D systems.Herein,based on the first-principles cal-culations and theor
【机 构】
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School of Physics and Technology,Institute of Spintronics,University of Jinan,Jinan 250022,China;Sch
论文部分内容阅读
The two-dimensional(2D)materials with nodal line band crossing have been attracting great research interest.How-ever,it remains a challenge to find high-stable nodal line structure in 2D systems.Herein,based on the first-principles cal-culations and theoretical analysis,we propose that monolayer B6O possesses symmetry protected Dirac nodal line(DNL)state,with its Fermi velocity of 106 m/s in the same order of magnitude as that of graphene.The origin of DNL fermions is induced by coexistence of time-reversal symmetry and inversion symmetry.A two-band tight-binding model is fur-ther given to understand the mechanism of DNL.Considering its robustness against spin-orbit coupling(SOC)and high structural stability,these results suggest monolayer B6O as a new platform for realizing future high-speed low-dissipation devices.
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