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Ultrafast Electron Relaxation through Coulomb Collisions in GaAs
Author(s) -
Camescasse F. X.,
Alexandrou A.,
Hulin D.
Publication year - 1997
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(199711)204:1<293::aid-pssb293>3.0.co;2-n
Subject(s) - redistribution (election) , coulomb , non equilibrium thermodynamics , electron , atomic physics , ultrashort pulse , relaxation (psychology) , range (aeronautics) , condensed matter physics , materials science , physics , molecular physics , optics , nuclear physics , quantum mechanics , psychology , social psychology , laser , politics , political science , law , composite material
We have used a nondegenerate pump–probe configuration allowing to isolate the electron dynamics in intrinsic GaAs. Nonequilibrium electron populations giving rise to spectral hole burning were observed for a wide range of densities and excess energies and their redistribution due to Coulomb collisions was studied. Surprisingly, the redistribution is slower at higher densities due to band‐filling effects and to the ineffectiveness of screening at early times and for low densities.