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HL: Fachverband Halbleiterphysik

HL 55: Quantum Dots and Wires: (Single) Photonics

HL 55.2: Vortrag

Freitag, 13. März 2026, 09:45–10:00, POT/0251

Deterministic single-photon source with on-chip GHz acoustic clock — •Alexander Kuznetsov¹, Meysam Saeedi¹, Zixuan Wang², Kevin Silverman², and Klaus Biermann¹ — ¹Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e. V., Hausvogteiplatz 5-7, 10117 Berlin, Germany — ²National Institute of Standards and Technology, Boulder, Colorado 80305, USA

Solid state single-photon sources are a key component in quantum communication. Their efficiency depends strongly on the single-photon (SP) emission rates. Typically, the latter can be enhanced via Purcell effect by embedding quantum dots (QDs) in optical microcavities (MC), which requires the energy matching between MC optical mode and QD energies. Here, we demonstrate triggering of QD SP emission using dynamic Purcell effect induced by acoustic strain at a frequency of several GHz. To this end, InAs QDs are integrated in a hybrid photon-phonon AlGaAs microcavity, where the density of optical states is tailored by the lateral confinement of photons in um-sized traps defined lithographical patterning of the microcavity spacer. We demonstrate modulation of QD energy up to 14 GHz using quasi-monochromatic strain of a piezoelectrically excited bulk acoustic wave. The modulation periodically shifts the QD transition in resonance with a spectrally narrow confined optical mode, leading to an enhancement of emission, i.e., the dynamic Purcell effect. In combination with high-Q MCs this approach is promising for SP rates above 10 GHz under continuous wave optical excitation. [arXiv:2510.22826]

Keywords: single-photon source; microcavity; quantum dot; acoustic phonon; Purcell effect