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Acoustic-Phonon-Mediated Superconductivity in Rhombohedral Trilayer Graphene

TitleAcoustic-Phonon-Mediated Superconductivity in Rhombohedral Trilayer Graphene
Publication TypeJournal Article
Year of Publication2021
AuthorsY-Z. Chou, F. Wu, J. D. Sau, and S. Das Sarma
JournalPhys. Rev. Lett.
Volume127
Date PublishedOCT 29
Type of ArticleArticle
ISSN0031-9007
Abstract

Motivated by the observation of two distinct superconducting phases in the moireless ABC-stacked rhombohedral trilayer graphene, we investigate the electron-acoustic-phonon coupling as a possible pairing mechanism. We predict the existence of superconductivity with the highest T-c similar to 3 K near the Van Hove singularity. Away from the Van Hove singularity, T-c remains finite in a wide range of doping. In our model, the s-wave spin-singlet and f-wave spin-triplet pairings yield the same T-c, while other pairing states have negligible T-c. Our theory provides a simple explanation for the two distinct superconducting phases in the experiment and suggests that superconductivity and other interaction-driven phases (e.g., ferromagnetism) can have different origins.

DOI10.1103/PhysRevLett.127.187001