Tunable bandgaps and flat bands in twisted bilayer biphenylene carbon  

作　　者：Ya-Bin Ma Tao Ouyang Yuan-Ping Chen Yue-E Xie 马亚斌;欧阳滔;陈元平;谢月娥(School of Physics and Optoelectronics,Xiangtan University,Xiangtan 411105,China;Faculty of Science,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]School of Physics and Optoelectronics,Xiangtan University,Xiangtan 411105,China [2]Faculty of Science,Jiangsu University,Zhenjiang 212013,China

出　　处：《Chinese Physics B》2021年第7期451-455,共5页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant No.11874314);the Natural Science Foundation of Hunan Province,China(Grant No.2018JJ2377)。

摘　　要：Owing to the interaction between the layers,the twisted bilayer two-dimensional(2 D)materials exhibit numerous unique optical and electronic properties different from the monolayer counterpart,and have attracted tremendous interests in current physical research community.By means of first-principles and tight-binding model calculations,the electronic properties of twisted bilayer biphenylene carbon(BPC)are systematically investigated in this paper.The results indicate that the effect of twist will not only leads to a phase transition from semiconductor to metal,but also an adjustable band gap in BPC(0 me V to 120 me V depending on the twist angle).Moreover,unlike the twisted bilayer graphene(TBG),the flat bands in twisted BPC are no longer restricted by"magic angles",i.e.,abnormal flat bands could be appeared as well at several specific large angles in addition to the small angles.The charge density of these flat bands possesses different local modes,indicating that they might be derived from different stacked modes and host different properties.The exotic physical properties presented in this work foreshow twisted BPC a promising material for the application of terahertz and infrared photodetectors and the exploration of strong correlation.

关 键 词：twisted bilayer biphenylene carbon adjustable band gap flat bands 

分 类 号：O469[理学—凝聚态物理]