2012/09/19 by Justin C. W. Song, Klaas‐Jan Tielrooij, Klaas J. Tielrooij +3 · 4 citations
Chemistry · Materials Science · Physics and Astronomy · #Atomic physics #Cascade #Chemistry #Diamond and Carbon-based Materials Research #Electron #Excitation #Excited state #Graphene #Graphene research and applications #Materials science #Molecular physics #Nanotechnology #Optics #Photoexcitation #Photon #Physics #Quantum and electron transport phenomena #Quantum mechanics #Scaling #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.87.155429
published as Phys. Rev. B 87, 155429 (2013)
arxiv created 2012/09/19 · openalex publication_date 2013/04/23 · arxiv updated 2013/04/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.