Theory of carrier transport in graphene double-layer structure with carrier imbalance

TL;DR

This paper analyzes how carrier imbalance affects mobility in graphene double-layer systems and shows that mobility can be enhanced by tuning carrier density polarization and dielectric environment.

Contribution

It provides a theoretical evaluation of carrier mobility considering carrier imbalance in graphene double-layers using Boltzmann transport theory.

Findings

Mobility depends on carrier density polarization.

Optimizing dielectric environment improves mobility.

Carrier imbalance can be used to enhance transport properties.

Abstract

The carrier mobility of a graphene double-layer system is evaluated on the basis of the Boltzmann transport theory. In this system, two graphene layers are separated by a dielectric barrier layer. We focus on the cases in which there is carrier imbalance between the two layers. It is found that the mobility can be improved by controlling the carrier density polarization between the two layers if we choose an appropriate dielectric environment.