Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 107: Microcavities, polaritons and condensates
HL 107.5: Vortrag
Freitag, 20. März 2015, 11:15–11:30, EW 015
Nonlinear spectroscopy of exciton-polaritons in a GaAs-based microcavity — •Johannes Schmutzler1, Marc Aßmann1, Thomas Czerniuk1, Martin Kamp2, Christian Schneider2, Sven Höfling2,3, 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 — 3SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, KY16 9SS, United Kingdom
We present a systematic investigation of two-photon excitation processes in a GaAs-based microcavity in the strong-coupling regime. Second harmonic generation resonant to the upper and lower polariton level is observed, which exhibits a strong dependence on the photonic fraction of the corresponding polariton. In addition we have performed two-photon excitation spectroscopy to identify 2p exciton states which are crucial for the operation as a terahertz lasing device, which was suggested recently [1]. However, no distinct signatures of a 2p exciton state could be identified, which indicates a low two-photon pumping efficiency [2].
[1] A. V. Kavokin et al., Phys. Rev. Lett. 108, 197401 (2012)
J. Schmutzler et al., Phys. Rev. B 90, 075103 (2014)