|Title||Post-transient relaxation in graphene after an intense laser pulse|
|Publication Type||Journal Article|
|Year of Publication||2013|
|Authors||Zhang, J, Li, T, Wang, J, Schmalian, J|
|Journal||European Physical Journal-Special Topics|
|Type of Article||Article|
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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