Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 107: Microcavities, polaritons and condensates

HL 107.6: Talk

Friday, March 20, 2015, 11:45–12:00, EW 015

Excition-polariton relaxation in a ZnO-based microresonator — •Oliver Herrfurth, Tom Michalsky, Helena Franke, Chris Sturm, Rüdiger Schmidt-Grund, and Marius Grundmann — Universität Leipzig, Institut für Experimentelle Physik II, Linnéstraße 5, 04103 Leipzig

We report on time-resolved photoluminescence (PL) measurements of the lower polariton branch (LPB) in a microresonator (MR) with a wedge-shaped cavity revealing the impact of longitudinal optical (LO) phonons on the polariton relaxation at low temperatures. The MR was fabricated by pulsed laser deposition. The wedge-shaped cavity enables access to different detunings between the uncoupled exciton and photon mode by probing different positions on the sample surface. If the LPB ground state is in the spectral vicinity of a LO phonon replica of the exciton-like polariton reservoir, then the polariton system can scatter efficiently with LO phonons. In particular, for such detuning PL spectra show maximal intensity and time-resolved PL measurements detect the slowest decay of the polariton ensemble. For these measurements only a small interval in k-space around the LPB ground state was chosen and resolved in time with a streak camera.