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Chin. Phys. B, 2022, Vol. 31(3): 037305    DOI: 10.1088/1674-1056/ac4cba

Spin—orbit stable dirac nodal line in monolayer B6O

Wen-Rong Liu(刘文荣)1, Liang Zhang(张亮)1, Xiao-Jing Dong(董晓晶)2, Wei-Xiao Ji(纪维霄)1, Pei-Ji Wang(王培吉)1, and Chang-Wen Zhang(张昌文)1,†
1 School of Physics and Technology, Institute of Spintronics, University of Jinan, Jinan 250022, China;
2 School of Physics and Physical Engineering, Qufu Normal University, Qufu 273100, China
Abstract  The two-dimensional (2D) materials with nodal line band crossing have been attracting great research interest. However, it remains a challenge to find high-stable nodal line structure in 2D systems. Herein, based on the first-principles calculations 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 further 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.
Keywords:  monolayer B6O      Dirac nodal line      two-band tight-binding model  
Received:  17 September 2021      Revised:  03 January 2022      Accepted manuscript online:  19 January 2022
PACS:  73.20.At (Surface states, band structure, electron density of states)  
  75.70.Ak (Magnetic properties of monolayers and thin films)  
  75.70.Cn (Magnetic properties of interfaces (multilayers, superlattices, heterostructures))  
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 the National Natural Science Foundation of China (Grant Nos. 52173283 and 62071200).
Corresponding Authors:  Chang-Wen Zhang     E-mail:

Cite this article: 

Wen-Rong Liu(刘文荣), Liang Zhang(张亮), Xiao-Jing Dong(董晓晶), Wei-Xiao Ji(纪维霄), Pei-Ji Wang(王培吉), and Chang-Wen Zhang(张昌文) Spin—orbit stable dirac nodal line in monolayer B6O 2022 Chin. Phys. B 31 037305

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