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Journal Article

Twisted bilayer graphene: A phonon-driven superconductor

MPS-Authors

Bernevig,  B. Andrei
Max Planck Institute of Microstructure Physics, Max Planck Society;

External Resource

https://doi.org/10.1103/PhysRevLett.122.257002
(Publisher version)

https://link.aps.org/accepted/10.1103/PhysRevLett.122.257002
(Publisher version)

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Citation

Lian, B., Wang, Z., & Bernevig, B. A. (2019). Twisted bilayer graphene: A phonon-driven superconductor. Physical Review Letters, 122(25): 257002. doi:10.1103/PhysRevLett.122.257002.


Cite as: https://hdl.handle.net/21.11116/0000-0008-DC95-8
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.