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HL: Halbleiterphysik

HL 44: Poster II

HL 44.66: Poster

Donnerstag, 11. März 2004, 16:30–19:00, Poster A

Time-Resolved THz Spectroscopy Of Graphite Sheets — •Tobias Kampfrath, Luca Perfetti, Christian Frischkorn, and Martin Wolf — Fachbereich Physik der Freien Universität Berlin, Arnimallee 14, 14195 Berlin

Pump-and-probe transmission measurements were performed with approximately 30  nm thick highly oriented pyrolitic graphite sheets at room temperature in air. The sample was excited by a pump pulse centered at 775  nm. A delayed probe pulse probed the linear optical response parallel to the basal plane in a frequency range from about 10 to 30  THz. The field-resolved sampling of the probe pulses allows for the determination of the temporally changing in-plane component of the dielectric function. Data analysis shows that the transient signal decays on timescales of 200  fs and 2  ps, respectively, which we attribute to carrier relaxation.