| Issue |
Europhys. Lett.
Volume 40, Number 3, November I 1997
|
|
|---|---|---|
| Page(s) | 323 - 328 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1997-00466-6 | |
| Published online | 01 September 2002 | |
Coulomb quantum kinetics of degenerate resonant femtosecond four-wave mixing
Institut für Theoretische Physik, J. W. Goethe Universität Frankfurt,
Robert-Mayer-Str. 8, D-60054 Frankfurt a.M., Germany
Received:
23
June
1997
Accepted:
19
September
1997
Resonant time-resolved four-wave–mixing spectra are calculated for
direct-gap semiconductors. For pulses shorter than the build-up time of the
Coulomb screening (given by the period of a typical plasma oscillation) the
dephasing and relaxation of the excited carriers are
dominated by the bare Coulomb potential scattering. The quantum kinetics of
this regime results in an unusual decay law
![$\propto \exp[-an\tau^3]$](/articles/epl/abs/1997/27/40315/40315_tex_eq1.png)
for the integrated
four-wave–mixing signal with the delay time τ and the carrier
density n. Due to the wave properties contained in the
early time regime of quantum kinetics a sideband appears in the
spectrum of the
time-resolved four-wave mixing with a carrier-density–dependent
frequency separation from the main band. The conditions under which the
predicted new features can be measured are discussed.
PACS: 78.47.+p – Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter / 72.20.Dp – General theory, scattering mechanisms
© EDP Sciences, 1997
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