Moiré excitons in biased twisted bilayer graphene under pressure
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866908284497166336 |
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| author | Duarte, V. G. M. da Costa, D. R. Peres, N. M. R. Teles, L. K. Chaves, A. J. |
| author_facet | Duarte, V. G. M. da Costa, D. R. Peres, N. M. R. Teles, L. K. Chaves, A. J. |
| contents | Using the tight-binding model, we report a gap opening in the energy spectrum of the twisted bilayer graphene under the application of pressure, that can be further amplified by the presence of a perpendicular bias voltage. The valley edges are located along the K-Gamma path of the superlattice Brillouin Zone, with the bandgap reaching values up to 200 meV in the single-particle picture. Employing the formalism of the semiconductor Bloch equations, we observe an enhancement of the bandgap due to the electron-electron interaction, with a renormalization of the bandgap of about 160 meV. From the solution of the corresponding Bethe-Salpeter equation, we show that this system supports highly anisotropic bright excitons whose electrons and holes are strongly hybridized between the adjacent layers. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_09645 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Moiré excitons in biased twisted bilayer graphene under pressure Duarte, V. G. M. da Costa, D. R. Peres, N. M. R. Teles, L. K. Chaves, A. J. Mesoscale and Nanoscale Physics Using the tight-binding model, we report a gap opening in the energy spectrum of the twisted bilayer graphene under the application of pressure, that can be further amplified by the presence of a perpendicular bias voltage. The valley edges are located along the K-Gamma path of the superlattice Brillouin Zone, with the bandgap reaching values up to 200 meV in the single-particle picture. Employing the formalism of the semiconductor Bloch equations, we observe an enhancement of the bandgap due to the electron-electron interaction, with a renormalization of the bandgap of about 160 meV. From the solution of the corresponding Bethe-Salpeter equation, we show that this system supports highly anisotropic bright excitons whose electrons and holes are strongly hybridized between the adjacent layers. |
| title | Moiré excitons in biased twisted bilayer graphene under pressure |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2310.09645 |