Gate-controlled current switch in graphene

TL;DR

This paper demonstrates a numerical study of a graphene-based four-terminal device that functions as a gate-controlled current switch by guiding current along zigzag directions using a tunable pn-junction.

Contribution

It introduces a novel all-graphene device design that leverages zigzag current pathways and tunable pn-junctions for current switching.

Findings

Current flows along zigzag directions away from the Dirac point.

The device can be controlled via a gate to switch current paths.

Graphene's electronic properties are essential for device efficiency.

Abstract

We study numerically cross conductances in a four-terminal all-graphene setup. We show that far away from the Dirac point current flows along zigzag directions, giving the possibility to guide the current between terminals using a tunable pn-junction. The device operates as a gate-controlled current switch, and the electronic properties of graphene are crucial for efficient performance.