Spin—orbit stable dirac nodal line in monolayer B6O

doi:10.1088/1674-1056/ac4cba

中国物理B ›› 2022, Vol. 31 ›› Issue (3): 37305-037305.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

收稿日期:2021-09-17 修回日期:2022-01-03 接受日期:2022-01-19 出版日期:2022-02-22 发布日期:2022-03-01
通讯作者: Chang-Wen Zhang E-mail:ss_zhangchw@ujn.edu.cn
基金资助:
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).

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

Received:2021-09-17 Revised:2022-01-03 Accepted:2022-01-19 Online:2022-02-22 Published:2022-03-01
Contact: Chang-Wen Zhang E-mail:ss_zhangchw@ujn.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: monolayer B₆O, Dirac nodal line, two-band tight-binding model

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.

Key words: monolayer B₆O, Dirac nodal line, two-band tight-binding model

中图分类号: (Surface states, band structure, electron density of states)

73.20.At

75.70.Ak (Magnetic properties of monolayers and thin films) 75.70.Cn (Magnetic properties of interfaces (multilayers, superlattices, heterostructures))

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[J]. 中国物理B, 2022, 31(3): 37305-037305.

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Spin—orbit stable dirac nodal line in monolayer B₆O

Spin—orbit stable dirac nodal line in monolayer B₆O

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