| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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 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 |
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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.
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Received: 12 July 2022
Revised: 25 August 2022
Accepted manuscript online: 08 September 2022
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PACS:
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72.15.Jf
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(Thermoelectric and thermomagnetic effects)
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72.25.-b
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(Spin polarized transport)
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74.62.Dh
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(Effects of crystal defects, doping and substitution)
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66.35.+a
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(Quantum tunneling of defects)
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| 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
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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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