Journal
PHYSICAL REVIEW B
Volume 87, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.155429
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Funding
- NSS program, Singapore
- Office of Naval Research [N00014-09-1-0724]
- Fundacio Cellex Barcelona
- NWO Rubicon Grant
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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. DOI: 10.1103/PhysRevB.87.155429
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