Hot carrier diffusion in graphene

Hot carrier diffusion in graphene

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...

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Veröffentlicht in:arXiv.org 2011-02
Hauptverfasser: Ruzicka, Brian A, Wang, Shuai, Werake, Lalani K, Weintrub, Ben, Loh, Kian Ping, Zhao, Hui
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Sprache:eng
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Charge transport
Diffusion rate
Graphene
Optics
Physics - Materials Science
Physics - Mesoscale and Nanoscale Physics
Spatial resolution
Transport properties
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creator Ruzicka, Brian A
Wang, Shuai
Werake, Lalani K
Weintrub, Ben
Loh, Kian Ping
Zhao, Hui
description 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.
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subjects Charge transport
Diffusion rate
Graphene
Optics
Physics - Materials Science
Physics - Mesoscale and Nanoscale Physics
Spatial resolution
Transport properties
title Hot carrier diffusion in graphene
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