Sliding-dependent electronic structures of alternating-twist tetralayer graphene
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866914958280753152 |
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| author | Shin, Kyungjin Shin, Jiseon Lee, Yoonsung Min, Hongki Jung, Jeil |
| author_facet | Shin, Kyungjin Shin, Jiseon Lee, Yoonsung Min, Hongki Jung, Jeil |
| contents | We study the electronic structure of alternating-twist tetralayer graphene, especially near its magic angle $θ= 1.75^\circ$, for different AA, AB, and SP sliding geometries at their middle interface that divides two twisted bilayer graphenes. This sliding dependence is shown for the bandwidths, band gaps, and $K$-valley Chern numbers of the lowest-energy valence and conduction bands as a function of twist angle and interlayer potential difference. Our analysis reveals that the AA sliding is most favorable for narrow bands and gaps, and the AB sliding is most prone to developing finite valley Chern numbers. We further analyze the linear longitudinal optical absorptions as a function of photon energy and the absorption map in the moiré Brillouin zone for specific transition energies. A self-consistent Hartree calculation reveals that the AA system's electronic structure is the most sensitive to variations in carrier density. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_11527 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Sliding-dependent electronic structures of alternating-twist tetralayer graphene Shin, Kyungjin Shin, Jiseon Lee, Yoonsung Min, Hongki Jung, Jeil Mesoscale and Nanoscale Physics We study the electronic structure of alternating-twist tetralayer graphene, especially near its magic angle $θ= 1.75^\circ$, for different AA, AB, and SP sliding geometries at their middle interface that divides two twisted bilayer graphenes. This sliding dependence is shown for the bandwidths, band gaps, and $K$-valley Chern numbers of the lowest-energy valence and conduction bands as a function of twist angle and interlayer potential difference. Our analysis reveals that the AA sliding is most favorable for narrow bands and gaps, and the AB sliding is most prone to developing finite valley Chern numbers. We further analyze the linear longitudinal optical absorptions as a function of photon energy and the absorption map in the moiré Brillouin zone for specific transition energies. A self-consistent Hartree calculation reveals that the AA system's electronic structure is the most sensitive to variations in carrier density. |
| title | Sliding-dependent electronic structures of alternating-twist tetralayer graphene |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2406.11527 |