Quarter Metal Superconductivity

TL;DR

This paper explores the novel superconducting states in rhombohedral graphene quarter metals, highlighting a potential chiral topological pair-density wave with Majorana modes and unique symmetry properties.

Contribution

It identifies a specific single-band, single-valley superconducting state as a likely chiral topological pair-density wave in rhombohedral graphene quarter metals.

Findings

Presence of unpaired Majorana zero modes at edges and vortices

Observation of an anomalous intrinsic superconducting diode effect

Threefold symmetry in the superconducting state

Abstract

We investigate the recently discovered multiple superconducting states in rhombohedral graphene quarter metal. We demonstrate that one of these states features a single-spin, single-valley, single-band, single-Fermi-pocket parent state and is most likely a chiral topological pair-density wave, marked by a threefold symmetry that may not be spontaneously broken, unpaired Majorana zero modes at edges, vortices, and dislocations, and an anomalous intrinsic superconducting diode effect.