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HL: Fachverband Halbleiterphysik
HL 16: Ultrafast Phenoma II
HL 16.7: Talk
Monday, March 20, 2017, 17:00–17:15, POT 51
Long-life pulse states of exciton polariton condensates in GaAs QWs — •Bernd Berger1, Daniel Schmidt1, Marc Aßmann1, Martin Kamp2, Christian Schneider2, Sven Höfling2, and Manfred Bayer1 — 1Experimentelle Physik 2, Technische Universität Dortmund, D-44221 Dortmund, Germany — 2Technische Physik, Physikalisches Institut, Wilhelm Conrad Röntgen Research Center for Complex Material Systems, Universität Würzburg, D-97074 Würzburg, Germany
A ring-shaped CW laser is used to non-resonantly excite exciton polaritons in a two dimensional DBR microcavity. Due to phonon scattering and polariton-polariton scattering the exciton polaritons undergo relaxation and a condensate of polaritons is formed. An additional non-resonant pulsed laser is used to perturb the formed condensate. By performing a series of time resolved measurements the spatial and temporal dynamics are studied. In a comprehensive analysis we find an unexpected long living polariton signal after pulsed excitation. Its duration exceeds the polariton lifetime by more than one order of magnitude and could potentially store information for several hundreds of picoseconds.