# Charged Topological Solitons in Zigzag Graphene Nanoribbons

## TL;DR

This paper investigates topological solitons in zigzag graphene nanoribbons, revealing their role as charge excitations and their formation at magnetic domain interfaces, which influences charge accommodation.

## Contribution

It introduces the concept of topological solitons arising from magnetic degeneracy in zigzag graphene nanoribbons and explores their role as charge carriers.

## Key findings

- Solitons appear at interfaces between degenerate magnetic ground states.
- Charge addition favors soliton formation over conduction band occupation.
- Solitons serve as relevant charge excitations in the system.

## Abstract

Graphene nanoribbons with zigzag terminated edges have a magnetic ground state characterized by edge ferromagnetism and antiferromagnetic inter edge coupling. This broken symmetry state is degenerate in the spin orientation and we show that, associated with this degeneracy, the system has topological solitons. The solitons appear at the interface between degenerate ground states. These solitons are the relevant charge excitations in the system. When charge is added to the nanoribbon, the system energetically prefers to create magnetic domains and accommodate the extra electrons in the interface solitons rather than setting them in the conduction band.