Photo-excited Carrier Dynamics and Impact Excitation Cascade in Graphene
Mesoscale and Nanoscale Physics
2013-04-24 v1
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.
Keywords
Cite
@article{arxiv.1209.4346,
title = {Photo-excited Carrier Dynamics and Impact Excitation Cascade in Graphene},
author = {Justin C. W. Song and Klaas J. Tielrooij and Frank H. L. Koppens and Leonid S. Levitov},
journal= {arXiv preprint arXiv:1209.4346},
year = {2013}
}