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Q: Fachverband Quantenoptik und Photonik

Q 35: Ultrakurze Laserpulse: Anwendungen 2

Q 35.1: Vortrag

Mittwoch, 16. März 2011, 14:30–14:45, SCH A01

Ultrafast Lattice Heating in Graphite and few-layer Graphene monitored by Ultrafast Electron Diffraction — •Christian Gerbig, Silvio Morgenstern, Cristian Sarpe, Matthias Wollenhaupt, and Thomas Baumert — University of Kassel, Institute of Physics and Center of Interdisciplinary Nanostructure Science and Technology (CINSaT), D-34132 Kassel, Germany

Ultrafast Electron Diffraction (UED) has lately become one of the most promising techniques to directly provide insights into fundamental dynamics at the microscopic level and on the pico- to subpicosecond timescale [1]. The investigation of laser-induced structural dynamics in the recently discovered 2D material graphene via UED should bring new insights in its unique properties [2]. So far time-resolved electron crystallography has been used to study lattice vibrations and coherent motions of graphite sub-surfaces after photoexcitation [3,4].
In this contribution we present first results on the direct observation of transient lattice heating in free-standing graphite and few-layer graphene using UED. In addition, we show a new approach of our setup with the prospect to directly resolve coherent lattice motions.

[1] M. Chergui & A. H. Zewail, Chem. Phys. Chem. 10, 28 (2009)
[2] A. K. Geim & K. S. Novoselov, Nature Materials 6, 183 (2007)
[3] A. H. Zewail and coworkers, Phys. Rev. Lett. 100, 035501 (2008)
[4] R. K. Raman et al., Phys. Rev. Lett. 101, 077401 (2008)