Regensburg 2022 – scientific programme

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SYSD: SKM Dissertation Prize 2022

SYSD 1: SKM Dissertation Prize

SYSD 1.4: Invited Talk

Monday, September 5, 2022, 11:45–12:15, H2

Quantum dot optomechanics with surface acoustic waves — •Matthias Weiss — Institut für Physik, Universität Augsburg — Physikalisches Institut, WWU Münster

Phonons, the quanta of mechanical vibrations, represent fundamental excitation in solid state materials and interact strongly with literally any other system. This universal coupling and their low susceptibility to dissipation makes phonons ideally suited to manipulate dissimilar systems and interface them in hybrid technologies.

In this talk, I show experiments of the interaction between the coherent phonon field of a surface acoustic wave and a single quantum emitter, a semiconductor quantum dot, employing resonant light scattering. This approach provides an ideal testbed to study electron-phonon interactions and to implement optomechanical control schemes. I show that the dynamic strain field of the acoustic wave modulates the dot’s sharp optical transition at gigahertz frequencies enabling precisely triggered single photon emission and the generation of phononic sidebands in the optical spectrum. When combining two acoustic waves of different frequencies, spectral components are programmed by coherent wave mixing of photons and phonons by the quantum dot. I will discuss the experimental observations using a simple model of coupled phonon emission and absorption processes obeying well-defined phase matching conditions.