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HL: Halbleiterphysik

HL 36: Hauptvortrag Leitenstorfer

HL 36.1: Hauptvortrag

Donnerstag, 27. März 2003, 09:30–10:15, POT/81

Ultrabroadband Terahertz Experiments in Femtosecond Semiconductor Physics — •Alfred Leitenstorfer, Rupert Huber, Florian Tauser, and Andreas Brodschelm — Physik-Department E11, Technische Universität München

Recent progress in field-resolved detection and coherent generation of ultrafast electro-magnetic transients covering the entire mid-infrared spectral region is presented [1,2]. These techniques open up a direct way to trace charge movement on a time scale of 10 fs. We study some of the fastest processes occuring in condensed matter:
(i) Femtosecond transient transport in GaAs, InP and Si semiconductor devices is investigated via ultrabroadband THz emission spectroscopy [3].
(ii) The ultrafast buildup of Coulomb screening and collective behavior in a dense electon-hole plasma extremely far from thermal equilibrium is monitored in two-time optical pump – THz probe measurements [4].
Future fields of applications of these methods and the technological challenges involved will be discussed.

[1] A. Leitenstorfer et al., Appl. Phys. Lett. 74, 1516 (1999)

[2] R. Huber et al., Appl. Phys. Lett. 76, 3191 (2000)

[3] A. Leitenstorfer et al., Phys. Rev. Lett. 82, 5140 (1999),
Phys. Rev. B 61, 16642 (2000)

[4] R. Huber et al., Nature 414, 286 (2001)