TY - JOUR
T1 - Twisted Bilayer Graphene
T2 - A Phonon-Driven Superconductor
AU - Lian, Biao
AU - Wang, Zhijun
AU - Bernevig, B. Andrei
N1 - Funding Information:
B. L. is supported by Princeton Center for Theoretical Science at Princeton University. Z. W. acknowledges the support from the CAS Pioneer Hundred Talents Program. B. B. is supported by the Department of Energy Grant No. DE-SC0016239, the National Science Foundation EAGER Grant No. DMR 1643312, Simons Investigator Grants No. 404513, No. ONR N00014-14-1-0330, and No. NSF-MRSEC DMR-142051, the Packard Foundation, and the Schmidt Fund for Innovative Research.
Publisher Copyright:
© 2019 American Physical Society.
PY - 2019/6/28
Y1 - 2019/6/28
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.122.257002
DO - 10.1103/PhysRevLett.122.257002
M3 - Article
C2 - 31347876
AN - SCOPUS:85068595495
SN - 0031-9007
VL - 122
JO - Physical Review Letters
JF - Physical Review Letters
IS - 25
M1 - 257002
ER -