Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 38: Polaritons and Polariton Lasing
HL 38.4: Vortrag
Dienstag, 15. März 2011, 12:45–13:00, FOE Anorg
Magnetic Field Interaction of Exciton-Polaritons in GaInAs Quantum Well-Microcavities — •Arash Rahimi-Iman, Christian Schneider, Julian Fischer, Matthias Amthor, Sven Hoefling, Stephan Reitzenstein, Martin Kamp, and Alfred Forchel — Technische Physik, Universität Würzburg, D-97074 Wuerzburg, Germany
Polaritons formed by excitons and photons in strongly coupled quantum well (QW) semiconductor microcavities have initiated intensive studies of multiple particle physics in solids during the last decade. Bose-Einstein condensation of these quasi particles and the so-called polariton-lasing represent very interesting physical phenomena investigated in different material systems (Deng et al. 2002, Kasprzak et al. 2006). Since condensation is not feasible in ideal 2D systems, it only occurs in planar cavities if natural or artificial traps are provided.
We have studied polariton emission from artificial traps in planar cavities in the presence of external magnetic fields up to 5 T, The work focuses on the interaction of the spin-resolved excitonic component of trapped polaritons due to the Zeeman effect. We report on trap-size dependent Zeeman splittings up to 100 µeV and diamagnetic coefficients up to 0.025 meV/T2 of exciton-polaritons spatially confined by photonic quantum boxes in a planar single GaInAs QW-microcavity at 5 T. Providing a size variation of the traps ranging from 0.5 to 10 µm on a wide detuning range, quantized polariton modes were observed under non-resonant optical pumping.