中国物理B ›› 2023, Vol. 32 ›› Issue (1): 17201-017201.doi: 10.1088/1674-1056/ac904d

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Interface-induced topological phase and doping-modulated bandgap of two-dimensioanl graphene-like networks

Ningjing Yang(杨柠境)1, Hai Yang(杨海)1,†, and Guojun Jin(金国钧)1,2,‡   

  1. 1 School of Physics Science and Technology, Kunming University, Kunming 650214, China;
    2 National Laboratory of Solid State Microstructures, Department of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • 收稿日期:2022-07-12 修回日期:2022-08-25 接受日期:2022-09-08 出版日期:2022-12-08 发布日期:2022-12-08
  • 通讯作者: Hai Yang, Guojun Jin E-mail:kmyangh@263.net;gjin@nju.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12074156 and 12164023) and the Yunnan Local College Applied Basic Research Projects (Grant No. 2021Y710).

Interface-induced topological phase and doping-modulated bandgap of two-dimensioanl graphene-like networks

Ningjing Yang(杨柠境)1, Hai Yang(杨海)1,†, and Guojun Jin(金国钧)1,2,‡   

  1. 1 School of Physics Science and Technology, Kunming University, Kunming 650214, China;
    2 National Laboratory of Solid State Microstructures, Department of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • Received:2022-07-12 Revised:2022-08-25 Accepted:2022-09-08 Online:2022-12-08 Published:2022-12-08
  • Contact: Hai Yang, Guojun Jin E-mail:kmyangh@263.net;gjin@nju.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12074156 and 12164023) and the Yunnan Local College Applied Basic Research Projects (Grant No. 2021Y710).

摘要: Biphenylene is a new topological material that has attracted much attention recently. By amplifying its size of unit cell, we construct a series of planar structures as homogeneous carbon allotropes in the form of polyphenylene networks. We first use the low-energy effective model to prove the topological three periodicity for these allotropes. Then, through first-principles calculations, we show that the topological phase has the Dirac point. As the size of per unit cell increases, the influence of the quaternary rings decreases, leading to a reduction in the anisotropy of the system, and the Dirac cone undergoes a transition from type II to type I. We confirm that there are two kinds of non-trivial topological phases with gapless and gapped bulk dispersion. Furthermore, we add a built-in electric field to the gapless system by doping with B and N atoms, which opens a gap for the bulk dispersion. Finally, by manipulating the built-in electric field, the dispersion relations of the edge modes will be transformed into a linear type. These findings provide a hopeful approach for designing the topological carbon-based materials with controllable properties of edge states.

关键词: polyphenylene, interface, band structure, Zak phase, edge state

Abstract: Biphenylene is a new topological material that has attracted much attention recently. By amplifying its size of unit cell, we construct a series of planar structures as homogeneous carbon allotropes in the form of polyphenylene networks. We first use the low-energy effective model to prove the topological three periodicity for these allotropes. Then, through first-principles calculations, we show that the topological phase has the Dirac point. As the size of per unit cell increases, the influence of the quaternary rings decreases, leading to a reduction in the anisotropy of the system, and the Dirac cone undergoes a transition from type II to type I. We confirm that there are two kinds of non-trivial topological phases with gapless and gapped bulk dispersion. Furthermore, we add a built-in electric field to the gapless system by doping with B and N atoms, which opens a gap for the bulk dispersion. Finally, by manipulating the built-in electric field, the dispersion relations of the edge modes will be transformed into a linear type. These findings provide a hopeful approach for designing the topological carbon-based materials with controllable properties of edge states.

Key words: polyphenylene, interface, band structure, Zak phase, edge state

中图分类号:  (Thermoelectric and thermomagnetic effects)

  • 72.15.Jf
72.25.-b (Spin polarized transport) 74.62.Dh (Effects of crystal defects, doping and substitution) 66.35.+a (Quantum tunneling of defects)