QUANTUM MATERIALS AND DEVICES SEMINARS: Sublattice-Pseudospin-Paramagnon Mediated Superconductivity in Magic Angle Twisted Bilayer Graphene

DIPC Seminars

Speaker: Chunli Huang, University of Texas at Austin, US
When: 2021/09/29
17:00
Place: Online Seminar, Donostia International Physics Center
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QUANTUM MATERIALS AND DEVICES SEMINARS: Sublattice-Pseudospin-Paramagnon Mediated Superconductivity in Magic Angle Twisted Bilayer Graphene

We present a theory of superconductivity in twisted bilayer graphene in which an attractive interaction is generated between electrons on the same honeycomb sublattice when the system is close to sublattice polarization instability. The resulting Cooper pairs are spin-polarized and valley-singlets. In our theory superconductivity is suppressed by i) applying a sub-lattice polarizing field (generated by an aligned BN substrate) or by moire band filling to move further from sub-lattice instabilities or toward valley polarization instabilities. We comment on the relationship between our sublattice paramagnon model, and the phenomenology of superconductivity in twisted bilayer and multilayer graphene. host: Miguel A. Cazalilla REGISTRATION REQUIRED ZOOM: https://dipc- org.zoom.us/meeting/register/tZAqceGqrzMqE9fPWdhzaKxoIscCspVlFJ4Y