title: Structural and electronic properties of an ordered grain boundary formed by separated (1,0) dislocations in graphene.
abstract: We present an investigation of the structural and electronic properties of an ordered grain boundary (GB) formed by separated pentagon-heptagon pairs in single-layer graphene/SiO2 using scanning tunneling microscopy/spectroscopy (STM/STS), coupled with density functional theory (DFT) calculations. It is observed that the pentagon-heptagon pairs, i.e., (1,0) dislocations, form a periodic quasi-one-dimensional chain. The (1,0) dislocations are separated by 8 transverse rows of carbon rings, with a period of ∼2.1 nm. The protruded feature of each dislocation shown in the STM images reflects its out-of-plane buckling structure, which is supported by the DFT simulations. The STS spectra recorded along the small-angle GB show obvious differential-conductance peaks, the positions of which qualitatively accord with the van Hove singularities from the DFT calculations.
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China. adzhao@ustc.edu.cn bwang@ustc.edu.cn.
authors.forename: Chuanxu
authors.initials: C
authors.lastname: Ma
authors.forename: Haifeng
authors.initials: H
authors.lastname: Sun
authors.forename: Hongjian
authors.initials: H
authors.lastname: Du
authors.forename: Jufeng
authors.initials: J
authors.lastname: Wang
authors.forename: Aidi
authors.initials: A
authors.lastname: Zhao
authors.forename: Qunxiang
authors.initials: Q
authors.lastname: Li
authors.forename: Bing
authors.initials: B
authors.lastname: Wang
authors.forename: J G
authors.initials: JG
authors.lastname: Hou