Time resolved carrier dynamics in graphene

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The linear dispersion relation and high mobility of charge carriers in graphene offer large potential for ultra-fast electronic and photonic devices, whose performance is intrinsically tied to the ultra-fast relaxation dynamics of nonequilibrium carrier dynamics. Hence understand-ing of the relaxation processes is crucial for designing high speed electronic and photonic devices. Femtosecond time resolved spectroscopy is a powerful tool to probe the evolution of the relaxation processes, as it can monitor sample properties on a time scale of a few tens of femtoseconds, which is indispensable to observe the quasi particle dynamics in graphene.By an interdisciplinary approach between electrical-engineering and funda-mental physics the ultra-fast relaxation processes in graphene and gra-phene based devices will be investigated using time-resolved femtosecond spectroscopy to gain knowledge necessary for understanding electronic transport in high speed electronic and photonic devices. Aside from the application on electronic devices the feasibility of using graphene as saturable absorber material for passive mode-locking in femtosecond lasers and as ultra-fast photo detectors will be explored.