Valley polarized electronic beam splitting in graphene

TL;DR

This paper demonstrates how trigonal warping in doped graphene can generate valley-polarized currents and proposes a device functioning as both a beam splitter and collimator, supported by optical analogies with photonic crystals.

Contribution

It introduces a novel device design leveraging trigonal warping for valley polarization and beam splitting in graphene, supported by optical analogies.

Findings

Valley-polarized currents can be achieved in doped graphene.

A device acting as a beam splitter and collimator is proposed.

Optical analogies confirm the feasibility of the device.

Abstract

We show how the trigonal warping effect in doped graphene can be used to produce fully valley polarized currents. We propose a device that acts both as a beam splitter and a collimator of these electronic currents. The result is demonstrated trough an optical analogy using two dimensional photonic crystals.