Photo-excited Carrier Dynamics and Impact Excitation Cascade in Graphene

Abstract

Photo-excitation in solids can trigger a cascade in which multiple particle-hole excitations are generated. We analyze the carrier multiplication cascade of impact excitation processes in graphene and show that the number of pair excitations has a strong dependence on doping, which makes carrier multiplication gate-tunable. We also predict that the number of excited pairs as well as the characteristic time of the cascade scale linearly with photo-excitation energy. These dependences, as well as sharply peaked angular distribution of pair excitations, provide clear experimental signatures of carrier multiplication.

References in corpus (8)

• Dielectric function, screening, and plasmons in 2D graphene
• Photo-excitation Cascade and Multiple Carrier Generation in Graphene
• First direct observation of Dirac fermions in graphite
• Ultrafast Photoluminescence from Graphene
• The Role of Electron-electron Interactions in Graphene ARPES Spectra
• Slow imbalance relaxation and thermoelectric transport in graphene
• Electron-Hole Generation and Recombination Rates for Coulomb Scattering in Graphene
• Inelastic carrier lifetime in graphene

Cited by in corpus (6)

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• Energy Flows in Graphene: Hot Carrier Dynamics and Cooling
• Giant intrinsic photoresponse in pristine graphene