Twisted Bilayer Graphene: A Phonon-Driven Superconductor

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

doi:10.1103/physrevlett.122.257002

Title: 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)
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.

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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, Vol. 122, Issue 25; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 184 works

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Spectroscopy of Twisted Bilayer Graphene Correlated Insulators

Journal Article · Thu Sep 08 00:00:00 EDT 2022 · Physical Review Letters · OSTI ID:1612433

Călugăru, Dumitru; Regnault, Nicolas; Oh, Myungchul; +6 more

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Physics
Electron-phonon coupling
Superconducting phase transition
Graphene
Low-temperature superconductors
Multilayer thin films
Two-dimensional electron system

Title: Twisted Bilayer Graphene: A Phonon-Driven Superconductor

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