Hot carrier diffusion in graphene

TL;DR

This study uses ultrafast optical techniques to measure hot carrier diffusion in graphene, revealing high diffusion coefficients and demonstrating a non-invasive method for assessing transport properties.

Contribution

It introduces a high-resolution optical pump-probe method to quantify hot carrier diffusion in different graphene samples, providing new insights into their transport dynamics.

Findings

Diffusion coefficients of 11,000 and 5,500 cm²/s in epitaxial and reduced graphene oxide

Carrier temperature around 3,600 K during measurements

Optical techniques enable non-contact, in-situ transport property detection

Abstract

We report an optical study of charge transport in graphene. Diffusion of hot carriers in epitaxial graphene and reduced graphene oxide samples are studied using an ultrafast pump-probe technique with a high spatial resolution. Spatiotemporal dynamics of hot carriers after a point-like excitation are monitored. Carrier diffusion coefficients of 11,000 and 5,500 squared centimeters per second are measured in epitaxial graphene and reduced graphene oxide samples, respectively, with a carrier temperature on the order of 3,600 K. The demonstrated optical techniques can be used for non-contact and non-invasive in-situ detection of transport properties of graphene.