Regensburg 2007 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)

MA 15.66: Poster

Dienstag, 27. März 2007, 15:00–19:00, Poster A

Charge and magnetization dynamics in correlated solids observed with THz time-domain spectroscopy — •Tobias Kampfrath, Jan Nötzold, Luca Perfetti, Christian Frischkorn, and Martin Wolf — Fachbereich Physik der Freien Universität Berlin, Arnimallee 14, D-14195 Berlin

THz pulses covering the spectral range from 8 to 30 THz have been employed to measure the dielectric function of carbon nanotube and graphite films which were excited with a 10-fs, 780-nm laser pulse. In contrast to graphite, the nanotube sample does not show a free-carrier response which clearly demonstrates that strongly bound excitons are the main product of photoexcitation in semiconducting nanotubes.

In case of ferromagnetic Fe, Co, and Ni films, we have detected the THz waveform that is emitted upon excitation of these samples with an intense 20-fs, 800-nm laser pulse. We discuss the origin of the emitted radiation and its relationship to the ultrafast magnetization dynamics of the sample.