SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 3: Focus Session: Progress in Hybrid Phononic Quantum Technologies I

HL 3.4: Talk

Monday, March 27, 2023, 10:45–11:00, POT 151

On-chip waveguides for hypersound with planar semiconductor optical microcavities — Antonio Crespo-Poveda, •Alexander Kuznetsov, Alberto Hernández-Mínguez, Abbes Tahraoui, Klaus Biermann, and Paulo Santos — Paul Drude Institute for Solid State Electronics, Berlin, Germany

In solid-state systems, coherent oscillations of the atomic lattice (phonons) couple to the majority of elementary excitations. This motivates studies that aim at creating phonon-based interfaces between photons and quantum systems. In this work, we show piezoelectric excitation of 6 GHz hypersound in a buried (Al,Ga)As planar waveguide. Acoustic echo spectroscopy reveals that phonons propagate over mm-long distances. Furthermore, the waveguide contains quantum wells and is embedded into an optical microcavity. The strong-coupling between nIR photons and excitons leads to the formation of light-matter quasiparticles -- polaritons. Due to the excitonic component, polaritons act as a sensitive local optical probe for gAPs. Thus, we demonstrated a conversion of microwave signals to guided hypersound with the subsequent polariton-mediated transduction to photons. In a broad context, the results are important for the remote coherent control of optoelectronic resonances and the realization of the on-chip phonon circuitry and a microwave-to-optical interface.