Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 60: III-V Semiconductors (no Nitrides)
HL 60.5: Vortrag
Mittwoch, 9. März 2016, 16:15–16:30, H13
Probing the Dynamics of Self-Localised Exciton-Polariton Condensates in Moving 2D Lattices — •Jakov V. T. Buller1, Raul E. Balderas-Navarro2, Klaus Biermann1, Edgar A. Cerda-Méndez1, and Paulo V. Santos1 — 1Paul-Drude-Institut für Festkörperelektronik, 10117 Berlin, Germany — 2Instituto de Investigación en Comunicación Óptica, 78000 San Luis Potosí, México
Microcavity exciton-polaritons are bosonic half-light half-matter quasi-particles which result from the strong coupling between light and excitons. Their low effective mass enables their condensation at low particle densities and high temperatures in comparison to atomic systems. Additionally, by introducing a periodic spatial modulation exciton-polariton gap solitons (GS), i.e. self-localised exciton-polariton condensates, can be created at excitation powers close to or above the condensation threshold.
In this contribution, we report on the temporal dynamics of GS in moving acoustic square lattices generated by surface acoustic waves (SAWs). Beside the observation of the temporal evolution of the GS wave function, we find that the GS photoluminescence (PL) shows periodic variations of its intensity at harmonics of the SAW frequency. These variations can reach up to tens of percent of the average PL intensity and depend on the power as well as on the FWHM of the excitation laser spot. Possible explanations will be addressed in the talk. Our results enhance the fundamental understanding of the self-localised exciton-polariton condensates and may be relevant for their implementation of polaritonic devices.