Post-transient relaxation in graphene after an intense laser pulse
Abstract
High intensity laser pulses were recently shown to induce a population inverted transient state in graphene [T. Li et al. Phys. Rev. Lett. 108, 167401 (2012)]. Using a combination of hydrodynamic arguments and a kinetic theory we determine the post-transient state relaxation of hot, dense, population inverted electrons towards equilibrium. The cooling rate and charge-imbalance relaxation rate are determined from the Boltzmann-equation including electron-phonon scattering. We show that the relaxation of the population inversion, driven by inter-band scattering processes, is much slower than the relaxation of the electron temperature, which is determined by intra-band scattering processes. This insight may be of relevance for the application of graphene as an optical gain medium.
Keywords
Cite
@article{arxiv.1303.7014,
title = {Post-transient relaxation in graphene after an intense laser pulse},
author = {Junhua Zhang and Tianqi Li and Jigang Wang and Joerg Schmalian},
journal= {arXiv preprint arXiv:1303.7014},
year = {2015}
}
Comments
10 pages, 4 figures, submitted as contribution of the IMPACT Special Topics series of the EPJ