Quantized multi-terminal resistances in ferromagnetic graphene p-n junctions

TL;DR

This paper investigates quantized multi-terminal resistances in ferromagnetic graphene p-n junctions under magnetic fields, revealing new robust quantum plateaus due to spin and potential interactions.

Contribution

It introduces a topologically protected measurement approach for quantized resistances in ferromagnetic graphene p-n junctions, highlighting nine distinct regimes based on charge carriers.

Findings

Observation of symmetric Hall and longitudinal resistances.

Revelation of new robust quantum plateaus.

Identification of nine regimes based on charge carrier types.

Abstract

The quantum Hall and longitudinal resistances in multi-terminal ferromagnetic graphene p-n junctions under a perpendicular magnetic field are investigated. In the Hall measurements, the transverse contacts are assumed to be located at p-n interface to avoid the mixing of edge states at the interface and the resulting quantized resistances are then topologically protected. According to the charge carrier type, the resistances in four-terminal p-n junction can be naturally divided into nine different regimes. The symmetric Hall and longitudinal resistances are observed, with lots of new robust quantum plateaus revealed due to the competition between spin splitting and local potentials.