Interfacial magnon-mediated superconductivity in twisted bilayer graphene

The interfacial coupling between electrons and magnons in adjacent layers can mediate an attractive electron–electron interaction and induce superconductivity. We consider magic-angle twisted bilayer graphene sandwiched between two ferromagnetic insulators to optimize this effect. As a result, magno...

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Bibliographic Details
Published in:New journal of physics 2024-03, Vol.26 (3), p.33014
Main Authors: Brekke, Bjørnulf, Sudbø, Asle, Brataas, Arne
Format: Article
Language:English
Subjects:
Bilayers
Electrons
Ferromagnetism
Fourier transforms
Graphene
heterostructure
Insulators
Interlayers
magnetism
Magnons
P waves
Superconductivity
Temperature
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Summary:The interfacial coupling between electrons and magnons in adjacent layers can mediate an attractive electron–electron interaction and induce superconductivity. We consider magic-angle twisted bilayer graphene sandwiched between two ferromagnetic insulators to optimize this effect. As a result, magnons induce an interlayer superconducting state characterized by p -wave symmetry. We investigate two candidate ferromagnets. The van der Waals ferromagnet CrI 3 stands out because it allows compression to tune the superconducting state with an exponential sensitivity. This control adds a new dimension to the tunability of twisted bilayer graphene. Our results open a new path for exploring magnon-induced superconductivity.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/ad2ffd