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  1. 1 Acta Physica Polonica A

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  1. 1 1996

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  1. 1 Mos̆ko M.

  2. 1 Mos̆ková A.

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Near-Band Edge Spectral Hole in Quantum Well: No Evidence for Subpicosecond Plasma Thermalization

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Mos̆ko M., Mos̆ková A.
Acta Physica Polonica A
|
1996
|
vol. 90
|
issue 5
1055-1059
EN
We show that at low carrier energies and densities the carriers in a two-dimensional Coulomb gas interact via classical unscreened carrier-carrier collisions. This allows us to calculate exactly the thermalization due to the two-dimensional carrier-carrier collisions in a nonthermal low-density (≈10^{10} cm^{-2}) two-dimensional plasma excited near the band edge of an undoped GaAs quantum well. The thermalization is found to be 10-15 times slower than the 200 fs thermalization deduced from the previous spectral-hole burning measurements, which means that the spectral hole does not reflect the thermalization process. We also show that the Born approximation fails in describing such carrier-carrier collisions.
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