Superconductivity from repulsive interactions in Bernal-stacked bilayer graphene
Fuente:
arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866909470316036096 |
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| author | Wagner, Glenn Kwan, Yves H. Bultinck, Nick Simon, Steven H. Parameswaran, S. A. |
| author_facet | Wagner, Glenn Kwan, Yves H. Bultinck, Nick Simon, Steven H. Parameswaran, S. A. |
| contents | A striking series of experiments have observed superconductivity in Bernal-stacked bilayer graphene (BBG) when the energy bands are flattened by applying an electrical displacement field. Intriguingly, superconductivity manifests only at non-zero magnetic fields, or when spin-orbit coupling is induced in BBG by coupling to a substrate. We present detailed functional renormalization group and random-phase approximation calculations that provide a unified explanation for the superconducting mechanism in both cases. Both calculations yield a purely electronic $p$-wave instability of the Kohn-Luttinger (KL) type. The latter can be enhanced either by magnetic fields or Ising spin-orbit coupling, naturally explaining the behaviour seen in experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2302_00682 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Superconductivity from repulsive interactions in Bernal-stacked bilayer graphene Wagner, Glenn Kwan, Yves H. Bultinck, Nick Simon, Steven H. Parameswaran, S. A. Superconductivity Mesoscale and Nanoscale Physics Strongly Correlated Electrons A striking series of experiments have observed superconductivity in Bernal-stacked bilayer graphene (BBG) when the energy bands are flattened by applying an electrical displacement field. Intriguingly, superconductivity manifests only at non-zero magnetic fields, or when spin-orbit coupling is induced in BBG by coupling to a substrate. We present detailed functional renormalization group and random-phase approximation calculations that provide a unified explanation for the superconducting mechanism in both cases. Both calculations yield a purely electronic $p$-wave instability of the Kohn-Luttinger (KL) type. The latter can be enhanced either by magnetic fields or Ising spin-orbit coupling, naturally explaining the behaviour seen in experiments. |
| title | Superconductivity from repulsive interactions in Bernal-stacked bilayer graphene |
| topic | Superconductivity Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2302.00682 |