Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 16: Quantum dots and wires: Optical properties I

HL 16.11: Vortrag

Montag, 25. Februar 2008, 16:45–17:00, ER 164

Carrier relaxation in quantum dots by means of time resolved transmission in two color pump probe experiments — •Hannes Kurtze¹, Robert Heinle¹, Manfred Bayer¹, Jan Seebeck², Frank Jahnke², Dirk Reuter³, and Andreas Wiek³ — ¹Experimentelle Physik Universität Dortmund, D-44221 Dortmund, Germany — ²Institut für Theoretische Physik, Universität Bremen, 28334 Bremen, Germany — ³Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany

Systematic time-resolved pump-probe studies with independent variation of pump and probe energies have been performed on InAs/GaAs quantum dot samples covering a wide range of confinement parameters. From these studies a phonon bottleneck for carrier relaxation can be excluded for small delay times after pump excitation. The use of time resolved transmission instead of time resolved photoluminescence offers also the opportunity to observe optically inactive carrier populations and their dynamics. Typical results of such measurements will be given in this talk.