Photoexcited carrier dynamics and impact-excitation cascade in graphene
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Song-2013-Photoexcited carrier dynamics.pdf
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Author(s)
Tielrooij, Klaas J.
Koppens, Frank Henricus Louis
Song, Justin Chien Wen
Levitov, Leonid
Date Issued
April 2013
Journal
Physical Review B
Publisher
American Physical Society
Citation
Song, Justin C. W., Klaas J. Tielrooij, Frank H. L. Koppens, and Leonid S. Levitov. “Photoexcited Carrier Dynamics and Impact-Excitation Cascade in Graphene.” Phys. Rev. B 87, no. 15 (April 2013). © 2013 American Physical Society
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Final published version
Abstract
In materials with strong electron-electron interactions, photoexcitation can trigger a cascade in which multiple particle-hole excitations are generated. Here we analyze the cascade of impact-excitation processes in graphene in which many hot carriers are generated by a single absorbed photon. We show that the number of generated carriers has a strong dependence on doping (gate tunability). Linear scaling with photon energy is predicted for the number of pairs and for the duration of the cascade. These dependencies, along with a sharply peaked angular distribution of excited carriers, provide clear experimental signatures of hot carrier multiplication.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.87.155429
