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Coulomb interaction, phonons, and superconductivity in twisted bilayer graphene
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Journal Article
Coulomb interaction, phonons, and superconductivity in twisted bilayer graphene
2021
Overview
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.
Publisher
National Academy of Sciences
Subject
