| Title | Scanning tunneling microscopy and spectroscopy of finite-size twisted bilayer graphene |
| Authors | Wang, Wen-Xiao Jiang, Hua Zhang, Yu Li, Si-Yu Liu, Haiwen Li, Xinqi Wu, Xiaosong He, Lin |
| Affiliation | Beijing Normal Univ, Ctr Adv Quantum Studies, Dept Phys, Beijing 100875, Peoples R China. Soochow Univ, Coll Phys Optoelect & Energy, Suzhou 215006, Peoples R China. Peking Univ, State Key Lab Artificial Microstruct & Mesoscop P, Beijing 100871, Peoples R China. Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China. |
| Keywords | NANORIBBONS LAYERS |
| Issue Date | 2017 |
| Publisher | PHYSICAL REVIEW B |
| Citation | PHYSICAL REVIEW B.2017,96(11). |
| Abstract | Finite-size twisted bilayer graphene (TBG, where here the TBG is of nanoscale size) is quite unstable and will change its structure to a Bernal (or AB-stacking) bilayer with a much lower energy. Therefore, the lack of finite-size TBG makes its electronic properties difficult to access in experiments. In this paper, a special confined TBG is obtained in the overlaid area of two continuous misoriented graphene sheets. The width of the confined region of the TBG changes gradually from about 22 to 0 nm. By using scanning tunneling microscopy, we study carefully the structure and the electronic properties of finite-size TBG. Our results indicate that the low-energy electronic properties, including twist-induced Van Hove singularities (VHSs) and spatial modulation of the local density of states, are strongly affected by the translational symmetry breaking of the finite-size TBG. However, the electronic properties above the energy of the VHSs are almost not influenced by quantum confinement even when the width of the TBG is reduced to only a single moire spot. |
| URI | http://hdl.handle.net/20.500.11897/470813 |
| ISSN | 2469-9950 |
| DOI | 10.1103/PhysRevB.96.115434 |
| Indexed | SCI(E) |
| Appears in Collections: | 人工微结构和介观物理国家重点实验室 |
