Spin pumping into two-dimensional electron systems

TL;DR

This paper investigates how spin pumping injects spin currents into two different two-dimensional electron systems, graphene and 2DEG, highlighting the distinct effects of Klein tunneling on the process.

Contribution

It introduces a scattering theory analysis of spin pumping into 2D electron systems, emphasizing the role of Klein tunneling in graphene.

Findings

Spin currents differ significantly between graphene and 2DEG.

Klein tunneling critically influences spin injection in graphene.

Distinct spin pumping behaviors are observed in the two systems.

Abstract

We study the spin current injected by spin pumping into single layer graphene and the two-dimensional electron gas (2DEG) with ferromagnetic contacts using scattering theory. The spin currents pumped into graphene are very distinct from that into the 2DEG since importantly affected by Klein tunneling.