Programming twist angle and strain profiles in 2D materials

• 成果类型: Article
• 署名作者: Kapfer, Maelle; Jessen, Bjarke S.; Eisele, Megan E.; Fu, Matthew; Danielsen, Dorte R.; Darlington, Thomas P.; Moore, Samuel L.; Finney, Nathan R.; Marchese, Ariane; Hsieh, Valerie; Majchrzak, Paulina; Jiang, Zhihao; Biswas, Deepnarayan; Dudin, Pavel; Avila, Jose; Watanabe, Kenji; Taniguchi, Takashi; Ulstrup, Soren; Boggild, Peter; Schuck, P. J.; Basov, Dmitri N.; Hone, James; Dean, Cory R.
• 署名单位: Columbia University; Technical University of Denmark; Technical University of Denmark; Columbia University; Aarhus University; SOLEIL Synchrotron; Universite Paris Saclay
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-10047
• DOI: 10.1126/science.ade9995
• 发表日期: 2023-08-11
• 页码: 677-681
• 关键词: magic-angle; graphene; TRANSITION; disorder

摘要

Moire superlattices in twisted two-dimensional materials have generated tremendous excitement as a platform for achieving quantum properties on demand. However, the moire pattern is highly sensitive to the interlayer atomic registry, and current assembly techniques suffer from imprecise control of the average twist angle, spatial inhomogeneity in the local twist angle, and distortions caused by random strain. We manipulated the moire patterns in hetero- and homobilayers through in-plane bending of monolayer ribbons, using the tip of an atomic force microscope. This technique achieves continuous variation of twist angles with improved twist-angle homogeneity and reduced random strain, resulting in moire patterns with tunable wavelength and ultralow disorder. Our results may enable detailed studies of ultralow-disorder moire systems and the realization of precise strain-engineered devices.