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Time-resolved study of intervalence band thermalization in a GaAs quantum well

Zeitaufgelöste Untersuchungen von Intervalenzband Thermalisierungen in einem GaAs quantumwell
: Kim, A.M.T.; Hunsche, S.; Dekorsy, T.; Kurz, H.; Köhler, K.


Applied Physics Letters 68 (1996), No.21, pp.2956-2958
ISSN: 0003-6951
ISSN: 1077-3118
Journal Article
Fraunhofer IAF ()
heterostructure; Heterostruktur; III-V Halbleiter; III-V semiconductors; quantum wells; time resolved measurement; zeitaufgelöste Messung

The thermalization of optically excited cold holes in a GaAs quantum well is investigated by femtosecond two-color pump-probe measurements. Clear evidence is found for scattering from heavy-holes into the lowest light-hole band due to LO-phonon absorption. We obtain firm data on scattering times which depend strongly on lattice temperature. They vary from 230 fs at room temperature to 900 fs at T equal 05 K. The experimental data are well reproduced by numerical calculation.