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Research Article

Construction of twisted graphene–silicene heterostructures

Guangyuan Han1,2, Huan Shan1,2, Lizhi Zhang2,3, Wenpeng Xu1,2, Zhao-Yan Gao1,2, Hui Guo1,2, Geng Li1,2,4( ), Hong-Jun Gao1,2,4
Beijing National Center for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing 100190, China
Songshan Lake Materials Laboratory, Dongguan 523808, China
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Abstract

Van der Waals stacking of two-dimensional crystals with rotation or mismatch in lattice constants gives rise to rich physical phenomena that are closely related to the strong correlations and band topology. Twisted graphene and silicene heterobilayers have been theoretically predicted to host a tunable transport gap due to the mismatch of Dirac cones in the graphene and silicene layers. However, experimental realization of such twisted structure is challenging. Here, we report the formation of twisted graphene/silicene bilayers on Ru (0001) crystal via intercalation. Different moiré patterns form as single-crystalline graphene grows over different grains of the Ru surface. After silicon intercalation, graphene/silicene bilayers are observed with different twisting angles on top of different grains of the Ru substrate. Our work provides a new pathway towards construction of graphene based twisted heterobilayers.

Graphical Abstract

Twisted graphene/silicene heterobilayers are fabricated on Ru (0001) crystal via silicon intercalation. Twisting structures are demonstrated by a variety of moiré patterns provided by the single-crystalline graphene grown on different grains of the Ru substrate.

Keywords

twisted heterobilayersgraphenesilicenescanning tunneling microscopyfirst-principles calculations

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Nano Research
Volume 16 Issue 5,
May 2023
Pages 7926-7930
DOI: 10.1007/s12274-023-5408-5

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Cite this article:
Han G, Shan H, Zhang L, et al. Construction of twisted graphene–silicene heterostructures. Nano Research, 2023, 16(5): 7926-7930. https://doi.org/10.1007/s12274-023-5408-5
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Received: 12 October 2022
Revised: 30 November 2022
Accepted: 15 December 2022
Published: 11 February 2023
© Tsinghua University Press 2023