Numbers of donors and acceptors from transport measurements in graphene

TL;DR

This paper proposes a method to distinguish and quantify positive and negative impurity densities in graphene using transport measurements, leveraging the differential scattering of charge carriers by charged impurities.

Contribution

It introduces a novel approach to separately determine the densities of positive and negative impurities affecting graphene mobility based on scattering behavior.

Findings

Method accurately distinguishes impurity types

Quantifies impurity densities in graphene

Enhances understanding of scattering mechanisms

Abstract

A method is suggested to separately determine the surface density of positively and negatively charged impurities that limit the mobility in a graphene monolayer. The method is based on the exact result for the transport cross-section, according to which the massless carriers are scattered more strongly when they are attracted to a charged impurity than when they are repelled from it.