Acoustic-Phonon-Mediated Superconductivity in Rhombohedral Trilayer Graphene

This is the authors' abstract. We don't add key points for this paper.

Motivated by the observation of two distinct superconducting phases in the moiréless 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 Tc∼3 K near the Van Hove singularity. Away from the Van Hove singularity, Tc 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 Tc, while other pairing states have negligible Tc. 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.