Wave vector dependance of population and spin dynamics of exciton polaritons in bulk semiconductors

We study the dynamics of a system consisting of exciton polaritons and biexcitons in bulk semiconductors. The polariton dispersion curve is scanned in a pump-and-probe experiment by looking at different excitation and detection wavelengths. This allows us to determine the influence of the polaritonw...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2005, Vol.18
Main Authors: Cronenberger, Steeve, Rahimpour-Soleimani, Hamid, Ostatnický, Tomas, Crégut, Olivier, Gallart, Mathieu, Gilliot, Pierre, Hönerlage, Bernd
Format: Article
Language:English
Subjects:
Condensed Matter
Other
Physics
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Summary:We study the dynamics of a system consisting of exciton polaritons and biexcitons in bulk semiconductors. The polariton dispersion curve is scanned in a pump-and-probe experiment by looking at different excitation and detection wavelengths. This allows us to determine the influence of the polaritonwavevector on polariton-spin relaxation processes and on their overall population dynamics. We perform these studies at low temperatures in bulk CuCl samples on a sub-picosecond timescale. We evaluate how the optical properties close to the exciton resonance develop with time from induced absorption to gain, depending on the wavelength and the intensity of excitation. This allows us to determine the polariton- and biexciton-population relaxation dynamics inside the bottleneck spectral region, and their spin dynamics, and reveals the importance of scattering and propagation effects.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/18/1/023