Layer-dependent electromechanical response in twisted graphene moiré superlattices
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arXiv
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| Autori principali: | , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866909440672792576 |
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| author | Zhang, Hanhao Wei, Yuanhao Li, Yuhao Lin, Shengsheng Wang, Jiarui Taniguchi, Takashi Watanabe, Kenji Li, Jiangyu Shi, Yi Wang, Xinran Shi, Yan Fei, Zaiyao |
| author_facet | Zhang, Hanhao Wei, Yuanhao Li, Yuhao Lin, Shengsheng Wang, Jiarui Taniguchi, Takashi Watanabe, Kenji Li, Jiangyu Shi, Yi Wang, Xinran Shi, Yan Fei, Zaiyao |
| contents | The coupling of mechanical deformation and electrical stimuli at the nanoscale has been a subject of intense investigation in the realm of materials science. Recently, twisted van der Waals (vdW) materials have emerged as a platform to explore exotic quantum states. These states are intimately tied to the formation of moiré superlattices, which can be visualized directly exploiting the electromechanical response. However, the origin of the response, even in twisted bilayer graphene (tBLG), remains unsettled. Here, employing lateral piezoresponse force microscopy (LPFM), we investigate the electromechanical responses of marginally twisted graphene moiré superlattices with different layer thicknesses. We observe distinct LPFM amplitudes and spatial profiles in tBLG and twisted monolayer-bilayer graphene (tMBG), exhibiting effective in-plane piezoelectric coefficients of 0.05 pm/V and 0.35 pm/V, respectively. Force tuning experiments further underscore a marked divergence in their responses. The contrasting behaviors suggest different electromechanical couplings in tBLG and tMBG. In tBLG, the response near the domain walls is attributed to the flexoelectric effect, while in tMBG, the behaviors can be comprehended within the context of piezoelectric effect. Our results not only provide insights to electromechanical and corporative effects in twisted vdW materials with different stacking symmetries, but may also show their potential for engineering them at the nanoscale. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_11442 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Layer-dependent electromechanical response in twisted graphene moiré superlattices Zhang, Hanhao Wei, Yuanhao Li, Yuhao Lin, Shengsheng Wang, Jiarui Taniguchi, Takashi Watanabe, Kenji Li, Jiangyu Shi, Yi Wang, Xinran Shi, Yan Fei, Zaiyao Mesoscale and Nanoscale Physics Materials Science The coupling of mechanical deformation and electrical stimuli at the nanoscale has been a subject of intense investigation in the realm of materials science. Recently, twisted van der Waals (vdW) materials have emerged as a platform to explore exotic quantum states. These states are intimately tied to the formation of moiré superlattices, which can be visualized directly exploiting the electromechanical response. However, the origin of the response, even in twisted bilayer graphene (tBLG), remains unsettled. Here, employing lateral piezoresponse force microscopy (LPFM), we investigate the electromechanical responses of marginally twisted graphene moiré superlattices with different layer thicknesses. We observe distinct LPFM amplitudes and spatial profiles in tBLG and twisted monolayer-bilayer graphene (tMBG), exhibiting effective in-plane piezoelectric coefficients of 0.05 pm/V and 0.35 pm/V, respectively. Force tuning experiments further underscore a marked divergence in their responses. The contrasting behaviors suggest different electromechanical couplings in tBLG and tMBG. In tBLG, the response near the domain walls is attributed to the flexoelectric effect, while in tMBG, the behaviors can be comprehended within the context of piezoelectric effect. Our results not only provide insights to electromechanical and corporative effects in twisted vdW materials with different stacking symmetries, but may also show their potential for engineering them at the nanoscale. |
| title | Layer-dependent electromechanical response in twisted graphene moiré superlattices |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2406.11442 |