Twisted Bilayer Graphene: A Phonon-Driven Superconductor

Biao Lian, Zhijun Wang, B. Andrei Bernevig

Research output: Contribution to journalArticle

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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 θ≈1.05°. We show that phonon-mediated electron attraction at the magic angle is strong enough to induce a conventional intervalley pairing between graphene valleys K and K′ with a superconducting critical temperature Tc∼1 K, in agreement with the experiment. We predict that superconductivity can also be observed in TBG at many other angles θ 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 ab initio calculations.

Original languageEnglish (US)
Article number257002
JournalPhysical review letters
Volume122
Issue number25
DOIs
StatePublished - Jun 28 2019

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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