From Fractionalization to Chiral Topological Superconductivity in a Flat Chern Band

Abstract

We show that interacting electrons in a flat Chern band can form, in addition to fractional Chern insulators, a chiral $f$-wave topological superconductor that hosts neutral Majorana fermion edge modes. Superconductivity emerges from an interaction-induced metallic state that exhibits anomalous Hall effect, as observed in rhombohedral graphene and near the $\hat{I}½=\frac{2}{3}$ fractional Chern insulator in twisted transition metal dichalcogenides.

To appear in Physical Review Letters