Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 76: Graphene: Electronic properties (organized by O)

HL 76.13: Vortrag

Mittwoch, 2. April 2014, 19:00–19:15, WIL C107

Controlling and understanding the non-linear photoluminescence in graphene on a femtosecond time scale — •Richard Ciesielski1, Alberto Comin1, Matthias Handloser1, Kevin Donkers1, Torben Winzer2, Ermin Malic2, and Achim Hartschuh11Ludwig Maximilians Universität München & CeNS — 2TU Berlin

Upon excitation, graphene exhibits nonlinear photoluminescence [1-3] that reflects the charge-carrier population and relaxation around the K-point. We present microscopic measurements on high quality exfoliated graphene samples with a pulsed laser system of ca. 18fs and a broad spectrum centred at 800nm.

Using a pulse shaping setup we can measure and manipulate the incident pulse in amplitude and phase. We find that the PL intensity depends sensitively on the temporal shape of the laser pulse, which we use to study and control the charge-carrier relaxation processes of graphene. Our findings are compared to numerical calculations.

[1] Stöhr, Wachtrup, Phys. Rev. B 82, 121408(R) (2010)

[2] Malic, Winzer, Bobkin, Knorr, Phys. Rev. B 84, 205404 (2011)

[3] Malic, Knorr, John Wiley & Sons (2013)

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