# Strain Controlled Spin and Charge Pumping in Graphene Devices via Spin-orbit Coupled Barriers

## TL;DR

This paper proposes a graphene-based adiabatic quantum pump with strain and spin-orbit coupling, demonstrating how operation mode and strain influence spin and charge current control.

## Contribution

It introduces a novel graphene quantum pump model with strain and spin-orbit effects, analyzing different operation modes and their impact on current efficiency and control.

## Key findings

- Pump current amplitude depends on operation mode.
- Strain can suppress or enhance spin and charge currents.
- Optimal operation occurs when chemical potential oscillates.

## Abstract

We theoretically propose a graphene-based adiabatic quantum pump with intrinsic spin-orbit coupling (SOC) subject to strain where two time-dependent extrinsic spin-orbit coupled barriers drive spin and charge currents. We study three differing operation modes where i) location, ii) chemical potential, and iii) SOC of the two barriers oscillate periodically and out of phase around their equilibrium states. Our results demonstrate that the amplitude of adiabatically pumped currents highly depends on the considered operation mode. We find that such a device operates with highest efficiency and in a broader range of parameters where the barriers chemical potential drives the quantum pump. Our results also reveal that by introducing strain to the system, one can suppress or enhance the charge and spin currents separately, depending on strain direction.