# Directional control of charge and valley currents in a graphene-based device

## TL;DR

This paper demonstrates a graphene-based three-terminal device that achieves directional control of charge and valley currents using magnetic fields and Fermi energy tuning, advancing active valleytronics technology.

## Contribution

It introduces a novel method for unidirectional charge and valley current control in graphene devices with a three-terminal setup under magnetic fields.

## Key findings

- Unidirectional charge and valley currents can be controlled by Fermi energy and magnetic field.
- The device generates unidirectional transport at the same bias voltage.
- Valley depolarization depends on disorder concentration.

## Abstract

We propose a directional switching effect in a metallic device. To such end we exploit a graphene-based device with a three-terminal geometry in the presence of a magnetic field. We show that unidirectional charge and valley currents can be controlled by the Fermi energy and the magnetic field direction in the active device. Interestingly, unidirectional transport of charge and valley is generated between two-terminals at the same bias voltage. Furthermore, we quantify the valley depolarization as a function of disorder concentration. Our results open a way for active graphene-based valleytronics devices.