Edge states interferometry and spin rotations in zigzag graphene nanoribbons

TL;DR

This paper explores how edge states in zigzag graphene nanoribbons enable interference effects and spin rotations through external fields, without needing geometric holes, revealing potential for spintronic applications.

Contribution

It demonstrates that edge states cause interference oscillations and allow controlled spin rotations in graphene nanoribbons under external fields, without geometric modifications.

Findings

Edge states cause interference oscillations in electron transport.

External fields enable controlled spin rotations.

Interference effects occur without geometric holes.

Abstract

An interesting property of zigzag graphene nanoribbons is the presence of edge states which are extended along its borders but localized in the transverse direction. We show that because of this property, electron transport through an externally induced potential well displays two-paths-interference oscillations when subject either to a magnetic or a transverse electric field. This effect does not require the existence of an actual `hole' in the nanoribbon's geometry. Moreover, since edge states are spin polarized, having opposite polarization on opposite sides, such interference effect can be used to rotate the spin of the incident carriers in a controlled way.