Quantum Cafe: Sankar Das Sarma
Title: Superconductivity in Graphene: Twisted or not and phonons or not
Abstract: I will describe a number of theoretical approaches to understanding the unexpected observation of superconductivity, seemingly both singlet and. triplet, in various graphene multilayers, including twisted bilayer graphene, twisted double bilayer graphene, trilayer rhombohedral graphene, and bernal bilayer graphene. No superconductivity has ever been reported, however, in regular monolayer graphene. The fundamental theoretical question is whether there is a universal mechanism underlying all of this graphene superconductivity. I will provide (at least a partial) answer to this question. Theory from Maryland and experiments from several (non-Maryland) groups will be discussed and compared.
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