Acoustic-Phonon-Mediated Superconductivity in Rhombohedral Trilayer Graphene
Yang-Zhi Chou, Fengcheng Wu, Jay D. Sau, Sankar Das Sarma
DOI 10.1103/PhysRevLett.127.187001 · Physical Review Letters
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Abstract
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.
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