Theoretical determination of the effect of a screening gate on plasmon-induced superconductivity in twisted bilayer graphene
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866913267875577856 |
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| author | Peng, Liangtao Yudhistira, Indra Vignale, Giovanni Adam, Shaffique |
| author_facet | Peng, Liangtao Yudhistira, Indra Vignale, Giovanni Adam, Shaffique |
| contents | The microscopic pairing mechanism for superconductivity in magic-angle twisted bilayer graphene remains an open question. Recent experimental studies seem to rule out a purely electronic mechanism due to the insensitivity of the critical superconducting temperature to either a highly doped screening layer or the proximity to a metallic screening gate. In this theoretical work, we explore the role of external screening layers on the superconducting properties of twisted bilayer graphene within a purely electronic mechanism. Consistent with the experimental observations, we find that the critical temperature is unaffected by screening unless the screening layer is closer than 3 nanometers from the superconductor. Thus, the available transport data is not in contradiction with a plasmon-mediated mechanism. We also investigate other properties of this plasmon-mediated superconductivity including signatures in the tunneling density of states as probed in spectroscopy experiments. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2309_14767 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Theoretical determination of the effect of a screening gate on plasmon-induced superconductivity in twisted bilayer graphene Peng, Liangtao Yudhistira, Indra Vignale, Giovanni Adam, Shaffique Superconductivity Mesoscale and Nanoscale Physics Strongly Correlated Electrons The microscopic pairing mechanism for superconductivity in magic-angle twisted bilayer graphene remains an open question. Recent experimental studies seem to rule out a purely electronic mechanism due to the insensitivity of the critical superconducting temperature to either a highly doped screening layer or the proximity to a metallic screening gate. In this theoretical work, we explore the role of external screening layers on the superconducting properties of twisted bilayer graphene within a purely electronic mechanism. Consistent with the experimental observations, we find that the critical temperature is unaffected by screening unless the screening layer is closer than 3 nanometers from the superconductor. Thus, the available transport data is not in contradiction with a plasmon-mediated mechanism. We also investigate other properties of this plasmon-mediated superconductivity including signatures in the tunneling density of states as probed in spectroscopy experiments. |
| title | Theoretical determination of the effect of a screening gate on plasmon-induced superconductivity in twisted bilayer graphene |
| topic | Superconductivity Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2309.14767 |