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Proceedings Paper

Ultrafast formation of many-particle interactions in a photoexcited electron-hole plasma
Author(s): Rupert Huber; Florian Tauser; Andreas Brodschelm; Max Bichler; Gerhard Abstreiter; Alfred Leitenstorfer
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Paper Abstract

Ultrabroadband THz spectroscopy is employed to observe how many-particle interactions build up in an extreme non-equilibrium electron-hole plasma. The plasma is photogenerated in bulk GaAs via resonant interband absorption of a 10 fs laser pulse. Subsequently, the dynamics of the complex dielectric function throughout the mid-infrared is directly monitored with uncertainty-limited temporal resolution with a single-cycle THz pulse. Field sensitive detection allows us to measure simultaneously real and imaginary part of the complex dielectric function of the plasma in the multi-THz regime. We show that collective phenomena such as Coulomb screening and plasmon scattering exhibit a delayed onset. This observation is explained in terms of the ultrafast formation of dressed quasiparticles. The time scale for this transient behavior is of the order of the inverse plasma frequency. Our findings support recent quantum kinetic calculations of the temporal evolution of the Coulomb interaction after ultrafast excitation of a dense electron-hole plasma.

Paper Details

Date Published: 30 May 2003
PDF: 8 pages
Proc. SPIE 4992, Ultrafast Phenomena in Semiconductors VII, (30 May 2003); doi: 10.1117/12.473201
Show Author Affiliations
Rupert Huber, Technische Univ. Muenchen (Germany)
Florian Tauser, Technische Univ. Muenchen (Germany)
Andreas Brodschelm, Technische Univ. Muenchen (Germany)
Max Bichler, Technische Univ. Muenchen (Germany)
Gerhard Abstreiter, Technische Univ. Muenchen (Germany)
Alfred Leitenstorfer, Technische Univ. Muenchen (Germany)

Published in SPIE Proceedings Vol. 4992:
Ultrafast Phenomena in Semiconductors VII
Kong-Thon F. Tsen; Jin-Joo Song; Hongxing Jiang, Editor(s)

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