Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 35: Acoustic Waves and Nanomechanics

HL 35.4: Talk

Thursday, September 8, 2022, 15:45–16:00, H34

A quantum dot coupled to a mechanical resonator — •Clemens Spinnler¹, Giang Nam Nguyen¹, Liang Zhai¹, Alisa Javadi¹, Andreas D. Wieck², Arne Ludwig², Ying Wang³, Peter Lodahl³, Leonardo Midolo³, and Richard J. Warburton¹ — ¹Department of Physics, University of Basel — ²Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum — ³Niels Bohr Institute, University of Copenhagen

Coupling a single-photon emitter to a mechanical resonator is a promising route towards operations involving a single photon and a single phonon. Semiconductor quantum dots (QDs) are bright sources of coherent single-photons, and their optical two-level transition can be coupled to mechanical motion via deformation potential coupling.

Here, we present a membrane-design resonator: a cantilever with a fundamental in-plane mode at 3.1 MHz with a quality factor as high as 22'000. The membrane design hosts a heterostructure diode for stabilising the QD's charge state. This results in narrow optical linewidths and a high mechanical sensitivity. We probe the Brownian motion at low temperature, 4 K, of the mechanical resonator via the resonance fluorescence from a single quantum dot. The mechanical noise imprinted on the QD's photons is extracted via an autocorrelation measurement. A single photon coupling strength of around 100 kHz is estimated. The in-plane mechanical motion probed here, together with the membrane design, allows a translation to higher frequencies using phononic-crystal resonators for which operation in the resolved-sideband regime becomes viable.