Optimization of carrier density in graphene via terahertz pulse shaping.
Pulse shaping calculations for the control of photo-excited carrier densities in graphene are presented. A spectral parametrization of the incident pulse using $B$-splines is used in order to obtain experimentally realistic pulses of bandwidth $\sim$ 3 THz. Optimization of the spectral shape is performed numerically via differential evolution, using the $B$-splines expansion coefficients as decision variables. Using this high-level optimization procedure, we find that it is possible to change the carrier density in graphene by a factor of 4 for a fixed pulse energy. The selective suppression of multi-photon absorption features in reciprocal space is also discussed, as well as the application of this theoretical work to the control of scattering mechanisms in graphene.
Publisher URL: http://arxiv.org/abs/1710.09889
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