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HL: Fachverband Halbleiterphysik

HL 26: Poster II

HL 26.1: Poster

Mittwoch, 11. März 2026, 09:30–11:30, P1

Quantum Dots in Nonlinear Mechanical Resonators — •Jona Richter, Noah Spitzner, Emeline Nysten, Matthias Weiss, and Hubert Krenner — Universität Münster, Münster, Germany

Surface acoustic waves are employed in a broad range of technologies, including radio-frequency filters in wireless communication systems and life-science applications. In the presented work, SAWs are utilized to drive mechanical modes in a quantum-dot membrane patterned into rings on a lithium niobate substrate. Generation of the SAWs is achieved by fabricating a comb-shaped interdigital transducer on the substrate. When an RF signal is applied, the piezoelectric response of the lithium niobate converts the electrical excitation into coherent acoustic waves propagating on the surface of the substrate. The propagating SAW induces a periodic modulation of the QD lattice constant, resulting in a corresponding modulation of the emission energy at the driving frequency. This mechanism enables the use of individual QDs as point-like nanoscale sensors, which can be probed through photoluminescence spectroscopy using ultrafast optical detection. When sweeping the RF frequency over a range of 200-900 MHz, pronounced resonances in the emission-energy modulation are observed, but only for QDs located within the ring structures. Both time-integrated as well as time-resolved measurements exhibit clear signatures of nonlinear mechanical behavior for example a hysteresis.

Keywords: Mechanical Nonlinearities; Quantum Dots; Surface Acoustic Waves