Dresden 2009 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 15: C/diamond I

HL 15.3: Talk

Tuesday, March 24, 2009, 10:00–10:15, POT 51

A comparison of the temperature-dependent charge carrier dynamics in naturally grown graphite and HOPG probed by time-resolved THz spectroscopy — •Konrad von Volkmann¹, Martin Scheuch¹, Luca Perfetti², Tobias Kampfrath¹, Christian Frischkorn¹, and Martin Wolf¹ — ¹Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin — ²Laboratoire des Solides Irradiés, Ecole polytechnique, 91128 Palaiseau cedex, France

The ultrafast charge carrier dynamics of naturally grown graphite and Highly Oriented Pyrolytic Graphite (HOPG) have been investigated by time-resolved THz spectroscopy in the range of 10 to 30 THz. For both samples, we present temperature dependent measurement of the scattering rates between 10 K and 300 K and give a comparison of the static dielectric function. While HOPG displays a clear rise of the scattering rate with temperature this behavior is hardly noticeable - if at all present - in the case for naturally grown graphite. A discussion of possible origins of this discrepancy will be given.