Unconventional double-bended saturation of carrier occupation in optically excited graphene due to many-particle interactions

Torben Winzer, Martin Mittendorff, Stephan Winnerl, Henry Mittenzwey, Roland Jago, Manfred Helm, Ermin Malic () and Andreas Knorr
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Torben Winzer: Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin
Martin Mittendorff: Institute for Research in Electronics & Applied Physics, University of Maryland
Stephan Winnerl: Helmholtz-Zentrum Dresden-Rossendorf
Henry Mittenzwey: Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin
Roland Jago: Chalmers University of Technology
Manfred Helm: Helmholtz-Zentrum Dresden-Rossendorf
Ermin Malic: Chalmers University of Technology
Andreas Knorr: Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract Saturation of carrier occupation in optically excited materials is a well-established phenomenon. However, so far, the observed saturation effects have always occurred in the strong-excitation regime and have been explained by Pauli blocking of the optically filled quantum states. On the basis of microscopic theory combined with ultrafast pump-probe experiments, we reveal a new low-intensity saturation regime in graphene that is purely based on many-particle scattering and not Pauli blocking. This results in an unconventional double-bended saturation behaviour: both bendings separately follow the standard saturation model exhibiting two saturation fluences; however, the corresponding fluences differ by three orders of magnitude and have different physical origin. Our results demonstrate that this new and unexpected behaviour can be ascribed to an interplay between time-dependent many-particle scattering and phase-space filling effects.

Date: 2017
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DOI: 10.1038/ncomms15042

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