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1 PublicationAbsorption saturation in optically pumped graphene
Winzer, T.; Knorr, A.; Mittendorff, M.; Winnerl, S.; Sun, D.; Norris, T. B.; Helm, M.; Malic, E.
Abstract
We investigate the saturation of the optical absorption in graphene induced by ultrafast optical pulses. Within a microscopic theory, we study the momentum-, angle-, and time-resolved interplay of anisotropic excitation, carrier-carrier and carrier-phonon scattering and its influence on the saturation of absorption and transmission as a function of the input intensity. In agreement with recent experiments, we observe a linear regime for the intensity-dependence of the transmission at low pump fluences and a nonlinear saturation in the high excitation regime. Applying 10 fs-pulses we obtain a saturation fluence of approximately 6.5mJ/cm2. We demonstrate how the interplay of Pauli-blocking and intensity-dependent relaxation determines the saturation behavior.
Involved research facilities
- Radiation Source ELBE DOI: 10.17815/jlsrf-2-58
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- DOI: 10.17815/jlsrf-2-58 is cited by this (Id 17534) publication
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Applied Physics Letters 101(2012)22, 221115
DOI: 10.1063/1.4768780
Cited 57 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-17534