Berlin 2018 – scientific programme
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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: Talk
Thursday, March 15, 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 fSAW ≅ 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)