Energy flows in graphene: hot carrier dynamics and cooling
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Levitov_Energy flows.pdf
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1.1 MB
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Author(s)
Song, Justin C. W.
Levitov, Leonid
Date Issued
April 2015
Journal
Journal of Physics: Condensed Matter
Publisher
IOP Publishing
Citation
Song, Justin C W, and Leonid S Levitov. “Energy Flows in Graphene: Hot Carrier Dynamics and Cooling.” J. Phys.: Condens. Matter 27, no. 16 (April 2, 2015): 164201.
Version
Author's final manuscript
Abstract
Long lifetimes of hot carriers can lead to qualitatively new types of responses in materials. The magnitude and time scales for these responses reflect the mechanisms governing energy flows. We examine the microscopics of two processes which are key for energy transport, focusing on the unusual behavior arising due to graphene's unique combination of material properties. One is hot carrier generation in its photoexcitation dynamics, where hot carriers multiply through an Auger type carrier–carrier scattering cascade. The hot-carrier generation manifests itself through elevated electronic temperatures which can be accessed in a variety of ways, in particular optical conductivity measurements. Another process of high interest is electron-lattice cooling. We survey different cooling pathways and discuss the cooling bottleneck arising for the momentum-conserving electron–phonon scattering pathway. We show how this bottleneck can be relieved by higher-order collisions—supercollisions—and examine the variety of supercollision processes that can occur in graphene.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1088/0953-8984/27/16/164201
