Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 35: Acoustic Waves and Nanomechanics

HL 35.1: Vortrag

Donnerstag, 8. September 2022, 15:00–15:15, H34

A hybrid (Al)GaAs-LiNbO₃ surface acoustic wave resonator for cavity quantum dot optomechanics — •Emeline Nysten¹, Armando Rastelli², and Hubert Krenner¹ — ¹Physikalisches Institut, WWU Münster, Germany — ²Institute of Semiconductor and Solid-State Physics, Johannes Kepler Universität Linz, Austria

Surface acoustic waves (SAW) are a useful tool to control the emission of quantum dots (QDs). In particular, SAWs enable the modulation of their energy levels through the deformation potential coupling [1]. Here, we explore the possibility to enhance the interaction between the SAW and the QDs by transferring them on a strong piezoelectric LiNbO₃ substrate by epitaxial lift-off [2,3]. Additionally, the membrane is transferred inside a SAW resonator confining the acoustic field inside the cavity. High acoustic quality factors of Q>4000 are demonstrated for the SAW resonator for an operation frequency of f=300 MHz and stay high even after the hybridization. The frequency and position dependent optomechanical coupling of single quantum dots with the resonator modes is recorded and quantified. A possible non-linear coupling between the QDs and the resonator modes is also observed [4]. [1] Appl. Phys. Lett. 93, 081115 (2008) [2] Phys. Rev. B 88, 085307 (2013) [3] J. Phys. D: Appl. Phys. 50, 43LT01 (2017) [4] Appl. Phys. Lett. 117, 121106 (2020)