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 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
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.
Fund: 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).
Corresponding Authors:
Hai Yang, Guojun Jin
E-mail: kmyangh@263.net;gjin@nju.edu.cn
Cite this article:
Ningjing Yang(杨柠境), Hai Yang(杨海), and Guojun Jin(金国钧) Interface-induced topological phase and doping-modulated bandgap of two-dimensioanl graphene-like networks 2023 Chin. Phys. B 32 017201
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