Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 34: Poster Session I (Graphene; Plasmonics and nanooptics; Coherence and coherent control in nanophotonics and plasmonics)

O 34.11: Poster

Tuesday, March 27, 2012, 18:15–21:45, Poster E

Non-linear optics in graphene — •Evgeny Bobkin, Torben Winzer, Ermin Malic, and Andreas Knorr — Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, 10623 Berlin, Germany

We present a microscopic study on non-linear optics in graphene including the investigation of Rabi oscillations, adiabatic following, and detuning effects. Our approach is based on the density matrix formalism, which allows a straight-forward inclusion of many-body interactions, such as excitonic effects. By solving the microscopic graphene Bloch equations we gain a time- and momentum-resolved access to the non-linear dynamics of the charge carriers and the coherence [1]. We investigate the appearance of Rabi oscillations as a function of time and pump fluence for different excitation regimes. Furthermore, we compare the free-particle and the excitonic picture to extract the influence of the Coulomb interaction.

[1] Ermin Malic, Torben Winzer, Evgeny Bobkin and Andreas Knorr, "Microscopic theory of excitonic absorption and ultrafast many-particle kinetics in graphene", Phys. Rev. B 84, 205406 (2011)