| Title | Designed growth of large bilayer graphene with arbitrary twist angles |
| Authors | Liu, Can Li, Zehui Qiao, Ruixi Wang, Qinghe Zhang, Zhibin Liu, Fang Zhou, Ziqi Shang, Nianze Fang, Hongwei Wang, Meixiao Liu, Zhongkai Feng, Zuo Cheng, Yang Wu, Heng Gong, Dewei Liu, Song Zhang, Zhensheng Zou, Dingxin Fu, Ying He, Jun Hong, Hao Wu, Muhong Gao, Peng Tan, Ping-Heng Wang, Xinqiang Yu, Dapeng Wang, Enge Wang, Zhu-Jun Liu, Kaihui |
| Affiliation | Peking Univ, Frontiers Sci Ctr Nanooptoelect, Sch Phys, State Key Lab Mesoscop Phys, Beijing, Peoples R China Renmin Univ China, Dept Phys, Beijing, Peoples R China Peking Univ, Int Ctr Quantum Mat, Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China Nanjing Univ Aeronaut & Astronaut, Inst Frontier Sci, Nanjing, Peoples R China Shanghai Tech Univ, Sch Phys Sci & Technol, ShanghaiTech Lab Topol Phys, Shanghai, Peoples R China Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing, Peoples R China Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen, Peoples R China Chinese Acad Sci, Inst Phys, Songshan Lake Mat Lab, Dongguan, Peoples R China Wuhan Univ, Sch Phys & Technol, Minist Educ, Key Lab Artificial Micro & Nanostruct, Wuhan, Peoples R China Peking Univ, Interdisciplinary Inst Light Element Quantum Mat, Beijing, Peoples R China Peking Univ, Res Ctr Light Element Adv Mat, Beijing, Peoples R China Liaoning Univ, Sch Phys, Shenyang, Peoples R China |
| Keywords | SINGLE-CRYSTAL GRAPHENE VAN-HOVE SINGULARITIES INSULATOR |
| Issue Date | Sep-2022 |
| Publisher | NATURE MATERIALS |
| Abstract | The production of large-area twisted bilayer graphene (TBG) with controllable angles is a prerequisite for proceeding with its massive applications. However, most of the prevailing strategies to fabricate twisted bilayers face great challenges, where the transfer methods are easily stuck by interfacial contamination, and direct growth methods lack the flexibility in twist-angle design. Here we develop an effective strategy to grow centimetre-scale TBG with arbitrary twist angles (accuracy, <1.0 degrees). The success in accurate angle control is realized by an angle replication from two prerotated single-crystal Cu(111) foils to form a Cu/TBG/Cu sandwich structure, from which the TBG can be isolated by a custom-developed equipotential surface etching process. The accuracy and consistency of the twist angles are unambiguously illustrated by comprehensive characterization techniques, namely, optical spectroscopy, electron microscopy, photoemission spectroscopy and photocurrent spectroscopy. Our work opens an accessible avenue for the designed growth of large-scale two-dimensional twisted bilayers and thus lays the material foundation for the future applications of twistronics at the integration level. Angle tunability in twisted bilayer graphene is crucial in promoting its applications of twistronics. Here an angle replication strategy is developed to obtain centimetre-scale bilayer graphene with arbitrary twist angles. |
| URI | http://hdl.handle.net/20.500.11897/654679 |
| ISSN | 1476-1122 |
| DOI | 10.1038/s41563-022-01361-8 |
| Indexed | SCI(E) |
| Appears in Collections: | 物理学院 人工微结构和介观物理国家重点实验室 量子材料科学中心 |
