In-Plane Critical Magnetic Fields in Magic-Angle Twisted Trilayer Graphene

It has recently been shown [Y. Cao, J. M. Park, K. Watanabe, T. Taniguchi, and P. Jarillo-Herrero, Pauli-limit violation and re-entrant superconductivity in moiré graphene, Nature (London) 595, 526 (2021).] that superconductivity in magic-angle twisted trilayer graphene survives to in-plane magnetic...

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Bibliographic Details
Published in:Physical review letters 2021-08, Vol.127 (9), p.097001-097001, Article 097001
Main Authors: Qin, Wei, MacDonald, Allan H.
Format: Article
Language:English
Subjects:
2-dimensional systems
BCS theory
Bilayers
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Electric fields
Graphene
Magnetic fields
methods in superconductivity
multiband superconductivity
spin-triplet pairing
Superconductivity
Symmetry
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Summary:It has recently been shown [Y. Cao, J. M. Park, K. Watanabe, T. Taniguchi, and P. Jarillo-Herrero, Pauli-limit violation and re-entrant superconductivity in moiré graphene, Nature (London) 595, 526 (2021).] that superconductivity in magic-angle twisted trilayer graphene survives to in-plane magnetic fields that are well in excess of the Pauli limit, and much stronger than the in-plane critical magnetic fields of magic-angle twisted bilayer graphene. The difference is surprising because twisted bilayers and trilayers both support the magic-angle flat bands thought to be the fountainhead of twisted graphene superconductivity. We show here that the difference in critical magnetic fields can be traced to a C2Mh symmetry in trilayers that survives in-plane magnetic fields, and also relative displacements between top and bottom layers that are not under experimental control at present. An gate electric field breaks the C2Mh symmetry and therefore limits the in-plane critical magnetic field.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.127.097001