From Fractionalization to Chiral Topological Superconductivity in a Flat Chern Band

TL;DR

This paper demonstrates that interacting electrons in a flat Chern band can give rise to a chiral f-wave topological superconductor with Majorana edge modes, expanding the understanding of topological phases in flat band systems.

Contribution

It introduces a new topological superconducting phase in flat Chern bands, connecting fractional Chern insulators and chiral superconductivity with Majorana modes.

Findings

Identification of a chiral f-wave topological superconductor in flat Chern bands.

Superconductivity arises from an interaction-induced metallic state with anomalous Hall effect.

Potential realization in rhombohedral graphene and twisted transition metal dichalcogenides.

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 $\nu=\frac{2}{3}$ fractional Chern insulator in twisted transition metal dichalcogenides.