Berlin 2018 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

DS: Fachverband Dünne Schichten

DS 27: New Twists for Nanoquakes on a Chip - Emerging Applications of Surface Acoustic Waves in Condensed Matter Physics (Focussed Session): Session I

DS 27.6: Vortrag

Donnerstag, 15. März 2018, 12:00–12:15, H 2032

Surface acoustic wave regulated single photon emission of a coupled quantum dot-nanocavity system — •Matthias Weiß¹, Stephan Kapfinger¹, Thorsten Reichert², Jonathan Finley², Achim Wixforth¹, Michael Kaniber², and Hubert Krenner¹ — ¹Lehrstuhl für Experimentalphysik 1, Universität Augsburg, 86159 Augsburg, Germany — ²Walter Schottky Institut, TU München, 85748 Garching, Germany

Here we report on a coupled quantum dot-nanocavity system in the weak coupling regime, that is dynamically tuned by the coherent elastic field of a f_SAW ≅ 800 MHz surface acoustic wav (SAW).[1] The SAW induced strain fields lead to a dynamic modulation of the cavity resonance by a combination of mechanical deformation and photo-elastic coupling and of the QD by deformation potential coupling. These effects lead to a dynamical tuning of the energy splitting between the single QD and the cavity. By applying a phase locked stroboscopic laser excitation scheme and the use of time and spectral resolved detection the SAW induced modulation of the interaction can be observed. These measurements show clearly a spectral resonance between QD and cavity at a well defined time during the acoustic cycle and the resulting increase of the QD-cavity interaction by the Purcell effect. This leads to a precisely timed single photon emission as confirmed by a direct measurement of the second order photon correlation function, g⁽²⁾, at the resonance.
M. Weiß et al., Appl. Phys. Lett. 109, 033105 (2016)