Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 28: Poster Session: Graphen; Transport properties; Transport in high magnetic fields / Quantum Hall effect; Metal-semiconductor hybrid systems

HL 28.12: Poster

Montag, 11. März 2013, 16:00–20:00, Poster A

Hot Carrier Photoluminescence in Graphene — •Andreas Neff, Reiner Bormann, Sascha Schäfer, and Claus Ropers — Materials Physics Institute and Courant Research Centre, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

The photoluminescence of hot carriers in graphene yields insight into the ultrafast carrier and phonon dynamics after optical excitation [1,2], providing complementary information to transient spectroscopy [3]. In this contribution, we study the blue-shifted spectral component of hot-carrier photoluminescence of graphene on sapphire substrates, excited by sub-10-fs near-infrared laser pulses. We characterise the nonlinear spectral dependence of the emission as a function of laser fluence and pulse duration. The experimental findings are analysed using a microscopic model of carrier dynamics based on Boltzmann rate equations, including carrier-carrier and carrier-phonon scattering processes. Specifically, the role of Auger recombination and impact ionization on the photoluminescence properties is discussed.
[1] C.H. Lui, et al., Phys. Rev. Lett. 105, 127404 (2010)

[2] W. Liu, et al., Phys. Rev. B. 82, 081408 (2010)

[3] M. Breusing, et al., Phys. Rev. B. 83, 153410 (2011)