Heterostrain and temperature-tuned twist between graphene/h-BN bilayers
Abstract Two-dimensional materials stacked atomically at small twist angles enable the modification of electronic states, motivating twistronics. Here, we demonstrate that heterostrain can rotate the graphene flake on monolayer h-BN within a few degrees (− 4° to 4°), and the twist angle stabilizes a...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-03-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-023-31233-3 |
| _version_ | 1797864993349173248 |
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| author | Xing Yang Bin Zhang |
| author_facet | Xing Yang Bin Zhang |
| author_sort | Xing Yang |
| collection | DOAJ |
| description | Abstract Two-dimensional materials stacked atomically at small twist angles enable the modification of electronic states, motivating twistronics. Here, we demonstrate that heterostrain can rotate the graphene flake on monolayer h-BN within a few degrees (− 4° to 4°), and the twist angle stabilizes at specific values with applied constant strains, while the temperature effect is negligible in 100–900 K. The band gaps of bilayers can be modulated from ~ 0 to 37 meV at proper heterostrain and twist angles. Further analysis shows that the heterostrain modulates the interlayer energy landscape by regulating Moiré pattern evolution. The energy variation is correlated with the dynamic instability of different stacking modes of bilayers, and arises from the fluctuation of interlayer repulsive interaction associated with p-orbit electrons. Our results provide a mechanical strategy to manipulate twist angles of graphene/h-BN bilayers, and may facilitate the design of rotatable electronic nanodevices. |
| first_indexed | 2024-04-09T23:00:52Z |
| format | Article |
| id | doaj.art-834cde31813948fda2f6f29de73a634a |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-09T23:00:52Z |
| publishDate | 2023-03-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-834cde31813948fda2f6f29de73a634a2023-03-22T10:59:37ZengNature PortfolioScientific Reports2045-23222023-03-011311810.1038/s41598-023-31233-3Heterostrain and temperature-tuned twist between graphene/h-BN bilayersXing Yang0Bin Zhang1State Key Laboratory of Mechanics and Control of Mechanical Structures, and College of Aerospace Engineering, Nanjing University of Aeronautics and AstronauticsState Key Laboratory of Mechanics and Control of Mechanical Structures, and College of Aerospace Engineering, Nanjing University of Aeronautics and AstronauticsAbstract Two-dimensional materials stacked atomically at small twist angles enable the modification of electronic states, motivating twistronics. Here, we demonstrate that heterostrain can rotate the graphene flake on monolayer h-BN within a few degrees (− 4° to 4°), and the twist angle stabilizes at specific values with applied constant strains, while the temperature effect is negligible in 100–900 K. The band gaps of bilayers can be modulated from ~ 0 to 37 meV at proper heterostrain and twist angles. Further analysis shows that the heterostrain modulates the interlayer energy landscape by regulating Moiré pattern evolution. The energy variation is correlated with the dynamic instability of different stacking modes of bilayers, and arises from the fluctuation of interlayer repulsive interaction associated with p-orbit electrons. Our results provide a mechanical strategy to manipulate twist angles of graphene/h-BN bilayers, and may facilitate the design of rotatable electronic nanodevices.https://doi.org/10.1038/s41598-023-31233-3 |
| spellingShingle | Xing Yang Bin Zhang Heterostrain and temperature-tuned twist between graphene/h-BN bilayers Scientific Reports |
| title | Heterostrain and temperature-tuned twist between graphene/h-BN bilayers |
| title_full | Heterostrain and temperature-tuned twist between graphene/h-BN bilayers |
| title_fullStr | Heterostrain and temperature-tuned twist between graphene/h-BN bilayers |
| title_full_unstemmed | Heterostrain and temperature-tuned twist between graphene/h-BN bilayers |
| title_short | Heterostrain and temperature-tuned twist between graphene/h-BN bilayers |
| title_sort | heterostrain and temperature tuned twist between graphene h bn bilayers |
| url | https://doi.org/10.1038/s41598-023-31233-3 |
| work_keys_str_mv | AT xingyang heterostrainandtemperaturetunedtwistbetweengraphenehbnbilayers AT binzhang heterostrainandtemperaturetunedtwistbetweengraphenehbnbilayers |