Quantum pumping in graphene with a perpendicular magnetic field

TL;DR

This paper investigates quantum pumping of Dirac fermions in graphene under a perpendicular magnetic field, demonstrating that measurable charge and spin currents can be generated through external voltage modulation.

Contribution

It introduces a scattering matrix approach to analyze quantum pumping in graphene with magnetic fields, providing predictions for observable charge and spin currents.

Findings

Predicted charge currents around 1000 nA are experimentally detectable.

Quantum pumping can generate significant spin currents in graphene.

Magnetic field influences the magnitude and direction of pumped currents.

Abstract

We consider quantum pumping of Dirac fermions in a monolayer of graphene in the presence of a perpendicular magnetic field in the central pumping region. The two external pump parameters are electrical voltages applied to the graphene sheet on either side of the pumping region. We analyze this pump within scattering matrix formalism and calculate both pumped charge and spin currents. The predicted charge currents are of the order of 1000 nA, which is readily observable using current technology.