Coulomb interaction, phonons, and superconductivity in twisted bilayer graphene.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 34362849.
- Also identified by DOI 10.1073/pnas.2107874118 and PMC identifier 8364166.
- Licence recorded as CC BY-NC-ND.
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Abstract
The polarizability of twisted bilayer graphene, due to the combined effect of electron-hole pairs, plasmons, and acoustic phonons, is analyzed. The screened Coulomb interaction allows for the formation of Cooper pairs and superconductivity in a significant range of twist angles and fillings. The tendency toward superconductivity is enhanced by the coupling between longitudinal phonons and electron-hole pairs. Scattering processes involving large momentum transfers, Umklapp processes, play a crucial role in the formation of Cooper pairs. The magnitude of the superconducting gap changes among the different pockets of the Fermi surface.