Berlin 2018 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 27: New Twists for Nanoquakes on a Chip - Emerging Applications of Surface Acoustic Waves in Condensed Matter Physics (Focussed Session): Session I
DS 27.9: Vortrag
Donnerstag, 15. März 2018, 12:45–13:00, H 2032
Multi-harmonic quantum dot optomechanics in fused LiNbO3-(Al)GaAs hybrids — •Emeline Nysten1,2, Yong Heng Huo3,4, Hailong Yu5, Guo Feng Song5, Armando Rastelli3, and Hubert J. Krenner1,2 — 1Lehrstuhl für Experimentalphysik 1, Universität Augsburg, Augsburg, Germany — 2Nanosystems Initiative Munich (NIM), München, Germany — 3Institute of Semiconductor and Solid State Physics, Johannes Kepler Universität Linz, Linz, Austria — 4University of Science and Technology of China, Shanghai, China — 5Chinese Academy of Sciences, Beijing, China
Surface acoustic waves (SAW) are used to control the emission of quantum dots (QDs) and, in particular, SAWs enable the injection of charge carriers into the dot or the modulation of their energy levels [1,2,3]. Here we explore the possiblility to enhance the interaction between the SAW and epitaxial GaAs QDs by tranferring them on a strong piezoelectric LiNbO3 substrate by epitaxial lift-off [4]. By employing multi-harmonic transducers, we generated sound waves on LiNbO3 over a wide range of radio frequencies. We monitored their coupling to and propagation across the semiconductor membrane, both in the electrical and optical domain. We demonstrate the enhanced optomechanical tuning of the embedded quantum dots with increasing frequencies. This effect was verified by finite element modelling of our device geometry and attributed to an increased localization of the acoustic field within the semiconductor membrane. References: [1]Appl.Phys.Lett. 93, 081115 (2008), [2]Nano Lett. 10, 3399-3407 (2010), [3]Phys.Rev.B 88, 085307 (2013), [4]Appl.Phys.Lett. 106, 013107 (2015)