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

作　　者：杨柠境 杨海 金国钧 Ningjing Yang;Hai Yang;Guojun Jin(School of Physics Science and Technology,Kunming University,Kunming 650214,China;National Laboratory of Solid State Microstructures,Department of Physics,and Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China)

机构地区：[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

出　　处：《Chinese Physics B》2023年第1期434-439,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos.12074156 and 12164023);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 

分 类 号：O469[理学—凝聚态物理] TB34[理学—电子物理学]