Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 16: Ultrafast Phenoma II

HL 16.7: Vortrag

Montag, 20. März 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.