Twisted Bilayer Graphene: A Phonon-Driven Superconductor

Lian, Biao; Wang, Zhijun; Bernevig, B. Andrei

doi:10.1103/physrevlett.122.257002

Twisted Bilayer Graphene: A Phonon-Driven Superconductor

Journal Article · Fri Jun 28 00:00:00 EDT 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.122.257002· OSTI ID:1612433

Lian, Biao ^[1]; Wang, Zhijun ^[2]; Bernevig, B. Andrei ^[3]

Princeton Univ., NJ (United States); DOE/OSTI
Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
Princeton Univ., NJ (United States); Freie Univ. Berlin (Germany); Max Planck Inst. of Microstructure Physics, Halle (Germany)

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 T_c ~ 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.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Univ., NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0016239

OSTI ID:: 1612433

Alternate ID(s):: OSTI ID: 1546267

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 25 Vol. 122; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Strong electron–phonon coupling in magic-angle twisted bilayer graphene

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