|Title||Theory of Phonon-Mediated Superconductivity in Twisted Bilayer Graphene|
|Publication Type||Journal Article|
|Year of Publication||2018|
|Authors||F. Wu, A.. H. MacDonald, and I. Martin|
|Journal||PHYSICAL REVIEW LETTERS|
|Date Published||DEC 17|
We present a theory of phonon-mediated superconductivity in near magic angle twisted bilayer graphene. Using a microscopic model for phonon coupling to moire band electrons, we find that phonons generate attractive interactions in both s- and d-wave pairing channels and that the attraction is strong enough to explain the experimental superconducting transition temperatures. Before including Coulomb repulsion, the s-wave channel is more favorable; however, on-site Coulomb repulsion can suppress s-wave pairing relative to d wave. The pair amplitude varies spatially with the moire period, and is identical in the two layers in the s-wave channel but phase shifted by pi in the d-wave channel. We discuss experiments that can distinguish the two pairing states.