Twisted Bilayer Graphene: A Phonon-Driven Superconductor
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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Princeton Univ., NJ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1612433
- Alternate Identifier(s):
- OSTI ID: 1546267
- Grant/Contract Number:
- SC0016239
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 122; Journal Issue: 25; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 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
Citation Formats
Lian, Biao, Wang, Zhijun, and Bernevig, B. Andrei. Twisted Bilayer Graphene: A Phonon-Driven Superconductor. United States: N. p., 2019.
Web. doi:10.1103/physrevlett.122.257002.
Lian, Biao, Wang, Zhijun, & Bernevig, B. Andrei. Twisted Bilayer Graphene: A Phonon-Driven Superconductor. United States. https://doi.org/10.1103/physrevlett.122.257002
Lian, Biao, Wang, Zhijun, and Bernevig, B. Andrei. Fri .
"Twisted Bilayer Graphene: A Phonon-Driven Superconductor". United States. https://doi.org/10.1103/physrevlett.122.257002. https://www.osti.gov/servlets/purl/1612433.
@article{osti_1612433,
title = {Twisted Bilayer Graphene: A Phonon-Driven Superconductor},
author = {Lian, Biao and Wang, Zhijun and Bernevig, B. Andrei},
abstractNote = {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.},
doi = {10.1103/physrevlett.122.257002},
journal = {Physical Review Letters},
number = 25,
volume = 122,
place = {United States},
year = {Fri Jun 28 00:00:00 EDT 2019},
month = {Fri Jun 28 00:00:00 EDT 2019}
}
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