Article Co-Dominant Piezoelectric and Flexoelectric Effects in Twisted Double Bilayer Graphene

Yuanhao Wei ; Yuhao Li ; Hanhao Zhang ; Shengsheng Lin ; Takashi Taniguchi SAMURAI ORCID ; Kenji Watanabe SAMURAI ORCID ; Cun-Fa Gao ; Yan Shi ORCID

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Yuanhao Wei, Yuhao Li, Hanhao Zhang, Shengsheng Lin, Takashi Taniguchi, Kenji Watanabe, Cun-Fa Gao, Yan Shi. Co-Dominant Piezoelectric and Flexoelectric Effects in Twisted Double Bilayer Graphene. Symmetry. 2024, 16 (11), 1524. https://doi.org/10.3390/sym16111524

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(abstract)

Controlling the balance between piezoelectric and flexoelectric effects is crucial for tailoring the electromechanical responses of a material. In twisted graphene, it is found that the electromechanical response near the domain walls (DWs) is dominated by either the flexoelectric effect as in twisted bilayer graphene (tBLG), or the piezoelectric effect as in twisted monolayer- bilayer graphene (tMBG). The codominance of both effects in a single system is rare. Here, utilizing lateral piezoresponse force microscopy (LPFM), we show piezoelectric and flexoelectric effects can coexist and are equally important in twisted double bilayer graphene (tDBG), termed as piezo- flexoelectric effect. Unlike tBLG and tMBG, distinctive two-step LPFM spatial profiles are captured across the moiré DWs of tDBG. By decomposing the LPFM signal into axisymmetric and antisymmetric components, we find that the angular dependence of both components satisfies sinusoidal relations. The conclusion is further supported by continuum mechanics simulations. Our results demonstrate that the stacking configuration serves as a powerful tuning knob for modulating the electromechanical responses of twisted van der Waals

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Keyword: Piezoelectric effect, flexoelectric effect, twisted graphene

Date published: 2024-11-14

Publisher: MDPI AG

Journal:

  • Symmetry (ISSN: 20738994) vol. 16 issue. 11 1524

Funding:

  • National Key Research and Development Program of China 2021YFA0715600
  • National Natural Science Foundation of China 12072150
  • National Natural Science Foundation of China 12274222
  • National Natural Science Foundation of China 12404217
  • National Science Foundation of Jiangsu Province BK20220756
  • Natural Science Foundation of Guangdong Province 2022A1515011773
  • National Natural Science Foundation of China for Creative Research Groups 51921003
  • JSPS KAKENHI 21H05233
  • JSPS KAKENHI 23H02052
  • World Premier International Research Center Initiative (WPI), MEXT, Japan

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.3390/sym16111524

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Updated at: 2025-02-05 12:31:18 +0900

Published on MDR: 2025-02-05 12:31:18 +0900

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