4.7 Article

In-situ twistable bilayer graphene

期刊

SCIENTIFIC REPORTS
卷 12, 期 1, 页码 -

出版社

NATURE PORTFOLIO
DOI: 10.1038/s41598-021-04030-z

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资金

  1. National Natural Science Foundation of China [11774224, 12074244, 61701394]
  2. Shuguang Program - Shanghai Education Development Foundation
  3. SJTU [21X010200846]
  4. Elemental Strategy Initiative by the MEXT, Japan [JPMXP0112101001]
  5. JSPS KAKENHI [19H05790]
  6. A3 Foresight by JSPS
  7. Centre for Advanced Electronic Materials and Devices (AEMD) of Shanghai Jiao Tong University (SJTU)
  8. Shanghai Municipal Education Commission

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This study demonstrates the construction of in-situ twistable bilayer graphene, which allows for the continuous and precise tuning of the twist angle. The controlled tuning is confirmed by various characterizations, and the developed devices enable systematic investigation of the twist angle effects in a single device, thus advancing twistronics research.
The electrical and optical properties of twisted bilayer graphene (tBLG) depend sensitively on the twist angle. To study the angle dependent properties of the tBLG, currently it is required fabrication of a large number of samples with systematically varied twist angles. Here, we demonstrate the construction of in-situ twistable bilayer graphene, in which the twist angle of the two graphene monolayers can be in-situ tuned continuously in a large range with high precision. The controlled tuning of the twist angle is confirmed by a combination of real-space and spectroscopic characterizations, including atomic force microscopy (AFM) identification of crystal lattice orientation, scanning near-field optical microscopy (SNOM) imaging of superlattice domain walls, and resonant Raman spectroscopy of the largely enhanced G-mode. The developed in-situ twistable homostructure devices enable systematic investigation of the twist angle effects in a single device, thus could largely advance the research of twistronics.

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