Chiral and topological superconductivity in isospin polarized multilayer graphene
Abstract
A microscopic mechanism for chiral superconductivity from Coulomb repulsion is proposed for spin- and valley-polarized state of rhombohedral multilayer graphene. The superconducting state occurs at low density, has chiral p-wave pairing symmetry, and exhibits highest Tc close to a Lifshitz transition from annular to simply-connected Fermi sea. This Lifshitz transition also marks a topological phase transition from a trivial to a topological superconducting phase hosting Majorana fermions. The chirality of the superconducting order parameter is selected by the chirality of the valley-polarized Bloch electrons. Our results are in reasonable agreement with observations in a recent experiment on tetralayer graphene [arXiv:2408.15233]
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