Dielectric Environment Effect on Carrier Mobility of Graphene Double-Layer Structure

TL;DR

This paper theoretically investigates how the dielectric environment influences the carrier mobility in graphene double-layer structures, highlighting the importance of the dielectric constant and interlayer distance for optimizing mobility.

Contribution

It provides a theoretical analysis of dielectric effects on carrier mobility in GDLS, identifying conditions to enhance mobility limited by charged impurities.

Findings

Carrier mobility depends strongly on the dielectric constant of the barrier layer.

Interlayer distance influences the dielectric effect on mobility.

Conditions for improving mobility are evaluated.

Abstract

We have theoretically studied the dielectric environment effect on the charged-impurity-limited carrier mobility of graphene double-layer structure (GDLS) on the basis of the Boltzmann transport theory. In this system, two graphene layers are separated by a dielectric barrier layer. It is pointed out that the carrier mobility strongly depends on the dielectric constant of the barrier layer when the interlayer distance becomes larger than the inverse of the Fermi wave vector. Moreover, the conditions to improve the charged-impurity-limited carrier mobility of the GDLS are evaluated.