Ferroelectricity in twisted double bilayer graphene
Fuente:
arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
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| _version_ | 1866911856840409088 |
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| author | Du, Renjun Xiao, Jingkuan Zhang, Di Cai, Xiaofan Jiang, Siqi Lian, Fuzhuo Watanabe, Kenji Taniguchi, Takashi Wang, Lei Yu, Geliang |
| author_facet | Du, Renjun Xiao, Jingkuan Zhang, Di Cai, Xiaofan Jiang, Siqi Lian, Fuzhuo Watanabe, Kenji Taniguchi, Takashi Wang, Lei Yu, Geliang |
| contents | Two-dimensional ferroelectrics can maintain vertical polarization up to room temperature, and are, therefore, promising for next-generation nonvolatile memories. Although natural two-dimensional ferroelectrics are few, moiré superlattices provide us with a generalized method to construct ferroelectrics from non-ferroelectric parent materials. We report a realization of ferroelectric hysteresis in a AB-BA stacked twisted double bilayer graphene (TDBG) system. The ferroelectric polarization is prominent at zero external displacement field and reduces upon increasing displacement fields. TDBG in the AB-BA configuration possesses a superlattice of non-centrosymmetric domains, exhibiting alternatively switchable polarities even without the assistance of any boron nitride layers; however, in the AB-AB stacking case, the development of polarized domains necessitates the presence of a second superlattice induced by the adjacent boron nitride layer. Therefore, twisted multilayer graphene systems offer us a fascinating field to explore two-dimensional ferroelectricity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_18059 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ferroelectricity in twisted double bilayer graphene Du, Renjun Xiao, Jingkuan Zhang, Di Cai, Xiaofan Jiang, Siqi Lian, Fuzhuo Watanabe, Kenji Taniguchi, Takashi Wang, Lei Yu, Geliang Mesoscale and Nanoscale Physics Two-dimensional ferroelectrics can maintain vertical polarization up to room temperature, and are, therefore, promising for next-generation nonvolatile memories. Although natural two-dimensional ferroelectrics are few, moiré superlattices provide us with a generalized method to construct ferroelectrics from non-ferroelectric parent materials. We report a realization of ferroelectric hysteresis in a AB-BA stacked twisted double bilayer graphene (TDBG) system. The ferroelectric polarization is prominent at zero external displacement field and reduces upon increasing displacement fields. TDBG in the AB-BA configuration possesses a superlattice of non-centrosymmetric domains, exhibiting alternatively switchable polarities even without the assistance of any boron nitride layers; however, in the AB-AB stacking case, the development of polarized domains necessitates the presence of a second superlattice induced by the adjacent boron nitride layer. Therefore, twisted multilayer graphene systems offer us a fascinating field to explore two-dimensional ferroelectricity. |
| title | Ferroelectricity in twisted double bilayer graphene |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2404.18059 |