# Charge and spin transport on graphene grain boundaries in a quantizing magnetic field

## TL;DR

This paper investigates how charge and spin transport occur along graphene grain boundaries under strong magnetic fields, revealing hybridized states, edge state deflections, and potential for spin filtering.

## Contribution

It introduces a detailed analysis of grain boundary states in graphene under quantum Hall conditions, highlighting their hybridization with Landau modes and potential for spin filtering.

## Key findings

- Transport states are formed by hybridization of Landau zero modes with interfacial states.
- Quantum Hall edge states can be deflected into grain boundary states, affecting conductance.
- Grain boundaries can act as gate-switchable spin filters with confined transport channels.

## Abstract

We study charge and spin transport along grain boundaries in single layer graphene in the presence of a quantizing magnetic field. Transport states in a grain boundary are produced by hybridization of Landau zero modes with interfacial states. In selected energy regimes quantum Hall edge states can be deflected either fully or partially into grain boundary states. The degree of edge state deflection is studied in the nonlocal conductance and in the shot noise. We also consider the possibility of grain boundaries as gate-switchable spin filters, a functionality enabled by counterpropagating transport channels laterally confined in the grain boundary.