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01493 am a22002293u 4500 |
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|a Tielrooij, Klaas J.
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|a Massachusetts Institute of Technology. Department of Physics
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|a Song, Justin Chien Wen
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|a Levitov, Leonid
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|a Koppens, Frank Henricus Louis
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|a Song, Justin Chien Wen
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|a Levitov, Leonid
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|a Photoexcited carrier dynamics and impact-excitation cascade in graphene
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|b American Physical Society,
|c 2014-08-19T14:47:42Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/88788
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|a 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.
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|a United States. Office of Naval Research (Grant N00014-09-1-0724)
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|a en_US
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|a Article
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|t Physical Review B
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