title: Bandgap opening/closing of graphene antidot lattices with zigzag-edged hexagonal holes.
abstract: How to predict the bandgap size of graphene antidot lattices (GALs) is a key problem in the field of graphene-based nanoelectronics. Here, we have obtained the universal rules on bandgap opening/closing of GALs with zigzag-edged hexagonal holes (ZH-GALs), as well as the means to control the bandgap size. In the simple case that the electronic property depends on the choice of the supercell, the quantitative relationship between Eg and the density/diameter of antidots is fitted. Turning to complex structures, we reveal that the bandgap opening in ZH-GALs results mainly from the intervalley scattering. In this interpretation, according to their relative position, the antidots can be divided into three categories. A relatively large bandgap appears in ZH-GALs, only when the numbers of the three categories are unequal. This could be explained based on a mechanism similar to diffraction. A formula according to the explanation is provided to estimate the bandgap, which can be used to predict the electronic properties of GALs and guide the design of semiconductor and photoelectronic devices based on GALs.
authors.affiliation: Powder Metallurgy Research Institute, and State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, P. R. China. xiongx228@sina.com.|School of Physics and Electronics, and Institute of Super-microstructure and Ultrafast Process in Advanced Materials, Central South University, Changsha 410083, P. R. China. zouhui1115@163.com.
authors.forename: Fangping
authors.initials: F
authors.lastname: Ouyang
authors.affiliation: Powder Metallurgy Research Institute, and State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, P. R. China. xiongx228@sina.com.
authors.forename: Shenglin
authors.initials: S
authors.lastname: Peng
authors.affiliation: School of Physics and Electronics, and Institute of Super-microstructure and Ultrafast Process in Advanced Materials, Central South University, Changsha 410083, P. R. China. zouhui1115@163.com.
authors.forename: Zhixiong
authors.initials: Z
authors.lastname: Yang
authors.affiliation: School of Physics and Electronics, and Institute of Super-microstructure and Ultrafast Process in Advanced Materials, Central South University, Changsha 410083, P. R. China. zouhui1115@163.com.
authors.forename: Yu
authors.initials: Y
authors.lastname: Chen
authors.affiliation: School of Physics and Electronics, and Institute of Super-microstructure and Ultrafast Process in Advanced Materials, Central South University, Changsha 410083, P. R. China. zouhui1115@163.com.
authors.forename: Hui
authors.initials: H
authors.lastname: Zou
authors.affiliation: Powder Metallurgy Research Institute, and State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, P. R. China. xiongx228@sina.com.
authors.forename: Xiang
authors.initials: X
authors.lastname: Xiong