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Non-Markovian polarization decay in semiconductor quantum wells by three-beam four-wave mixing

Nicht Markowscher Polarisationszerfall in Halbleiter Quantum Wells untersucht mittels Dreistrahl Vierwellen Mischen


Physica status solidi. B 188 (1995), S.435-445
ISSN: 0031-8957
ISSN: 0370-1972
Fraunhofer IAF ()
III-V Halbleiter; III-V semiconductors; quantum wells; time resolved photoluminescence; zeitaufgelöste Photolumineszenz

The polarization and population dynamics of resonantly generated excitions in GaAs/AlGaAs quantum well structures are investigated using transient three-pulse four-wave mixing. The decay dynamics show strongly nonexponential behavior for both variation of the delay between the second two pulses, which reflects the population dynamics. A comparison with a theoretical model schows that the dynamics of both polarization and population are mainly determined by frequency fluctuations and not by scattering processes or by recombination. The characteristic time of the fluctuations Tc has to be energy-dependent fo fully describe the results.