Giant tunable magnetoresistance of electrically gated graphene ribbon with lateral interface under magnetic field

TL;DR

This paper investigates the quantum behavior of electrically gated graphene ribbons with lateral junctions under magnetic fields, predicting giant, controllable magnetoresistance oscillations useful for electronic applications.

Contribution

It introduces a theoretical analysis of magnetoresistance in graphene ribbons with lateral junctions, revealing giant oscillations and controllable resistance changes under small magnetic or gate voltage variations.

Findings

Giant conductance oscillations in graphene ribbons with n-p-n junctions.

Magnetoresistance can be tuned by 50% to 90% with small magnetic or voltage changes.

Snake-like quasiparticle states do not significantly affect main conductance.

Abstract

Quantum dynamics and kinetics of electrically gated graphene ribbons with lateral n-p and e-n-p junctions under magnetic field are investigated. It is shown that the snake-like states of quasiparticles skipping along the n-p interface do not manifest themselve in the main semiclassical part of the ribbon conductance. Giant oscillations of the conductance of a ribbon with an n-p-n junction are predicted and analytically calculated. Depending on the number of junctions inside the ribbon its magnetoresistance may be controllably changed by 50% - 90% by an extremely small change of the magnetic field or the gate voltage.