Electron-electron interactions in the conductivity of graphene

TL;DR

This paper experimentally studies how electron-electron interactions affect the low-temperature conductivity of graphene, revealing a new temperature regime and the influence of disorder and chirality on interaction corrections.

Contribution

It provides the first experimental analysis of electron-electron interaction effects in graphene's conductivity, highlighting the role of disorder and chirality.

Findings

Interaction correction is sensitive to disorder details.

A new temperature regime where quantum interference is suppressed.

Interaction parameter F_0 is approximately -0.1, influenced by chirality.

Abstract

The effect of electron-electron interaction on the low-temperature conductivity of graphene is investigated experimentally. Unlike in other two-dimensional systems, the electron-electron interaction correction in graphene is sensitive to the details of disorder. A new temperature regime of the interaction correction is observed where quantum interference is suppressed by intra-valley scattering. We determine the value of the interaction parameter, F_0 ~ -0.1, and show that its small value is due to the chiral nature of interacting electrons.