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Post-transient relaxation in graphene after an intense laser pulse

TitlePost-transient relaxation in graphene after an intense laser pulse
Publication TypeJournal Article
Year of Publication2013
AuthorsZhang, J, Li, T, Wang, J, Schmalian, J
JournalEuropean Physical Journal-Special Topics
Date Published07
Type of ArticleArticle
ISBN Number1951-6355
Accession NumberWOS:000321914700021
Keywordsenergy relaxation

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 that 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.

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