TEP Seminar - Hubert Krenner

Elastic waves are an indispensable phononic technology finding applications in diverse fields ranging from the life sciences to quantum technologies [1]. In my talk, I will introduce surface acoustic wave (SAW) control of the optical properties of epitaxial semiconductor quantum dots (QDs). On this platform, QDs provide a unique ultrafast nanoscale strain sensor to map acoustic fields and an optically active two-level system for phononic frequency transduction of single photons [2]. I will show how the underlying optomechanical interaction can be deliberately exploited for three-wave mixing of near infrared photons and gigahertz phonons by the optical dipole of the QD [3]. Finally, I will discuss directions to exploit the universal coupling of phonons to both electronic (QD) and photonic degrees of freedom in integrated device platforms [4,5] for future hybrid information processing technologies.

[1] H. J. Krenner et al., The 2026 guided acoustic wave roadmap, J. Phys. D: Appl. Phys. 59, 093001 (2019).

[2] M. Weiß & H. J. Krenner, J. Phys. D: Appl. Phys. 51, 373001 (2018).

[3] M. Weiß et al., Optica 8, 291 (2021).

[4] D. D. Bühler et al., Nat. Commun. 13, 6998 (2022).

[5] M. Lienhart et al., J. Phys. D: Appl. Phys. 56, 365105 (2023).