paper

Twisted Bilayer Graphene: A Phonon Driven Superconductor

arXiv:1807.04382 · doi:10.1103/PhysRevLett.122.257002

Abstract

We study the electron-phonon coupling in twisted bilayer graphene (TBG), which was recently experimentally observed to exhibit superconductivity around the magic twist angle . We show that phonon-mediated electron electron attraction at the magic angle is strong enough to induce a conventional intervalley pairing between graphene valleys and with a superconducting critical temperature , in agreement with the experiment. We predict that superconductivity can also be observed in TBG at many other angles and higher electron densities in higher Moiré bands, which may also explain the possible granular superconductivity of highly oriented pyrolytic graphite. We support our conclusions by \emph{ab initio} calculations.

6+20 pages, 4+6 figures

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