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Twisted Bilayer Graphene: A Phonon-Driven Superconductor

Author(s): Lian, Biao; Wang, Zhijun; Bernevig, Bogdan A.

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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 theta approximate to 1.05 degrees 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 T-c similar to 1 K, in agreement with the experiment. We predict that superconductivity can also be observed in TBG at many other angles 9 and higher electron densities in higher moire bands, which may also explain the possible granular superconductivity of highly oriented pyrolytic graphite. We support our conclusions by ab initio calculations.
Publication Date: 28-Jun-2019
Electronic Publication Date: 28-Jun-2019
Citation: Lian, Biao, Wang, Zhijun, Bernevig, B Andrei. (2019). Twisted Bilayer Graphene: A Phonon-Driven Superconductor. PHYSICAL REVIEW LETTERS, 122, doi:10.1103/PhysRevLett.122.257002
DOI: doi:10.1103/PhysRevLett.122.257002
ISSN: 0031-9007
EISSN: 1079-7114
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW LETTERS
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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