SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 33: Poster II

HL 33.37: Poster

Wednesday, March 29, 2023, 17:00–19:00, P1

Electrical Stark tuning of multiple waveguides with integrated quantum dots — •Yuhui Yang¹, Shulun Li^1,2, Johannes Schall¹, Chirag Palekar¹, Léo Roche¹, Hanqing Liu², Sven Rodt¹, Haiqiao Ni², Zhichuan Niu², and Stephen Reitzenstein¹ — ¹Institut für Festkörperphysik, TU Berlin, 10623 Germany — ²Institute of Semiconductors, CAS, 100083, China

Self-assembled quantum dots (QDs) are promising candidates for future photonic quantum technologies owing to their close-to-ideal quantum properties. However, the random spectral and spatial distribution of single QD complicates the controlled integration of single QD into photonic structures using standard nano-processing technologies such as standard electron beam lithography and makes upscaling to complex quantum circuits practically impossible. We overcome these technical issues by combining cryogenic cathodoluminescence (CL) mapping for spectrally selected integration of QDs and the quantum-confined Stark effect for spectral fine-tuning. Two spectrally similar self-assembled QDs in a p-i-n diode membrane are pre-selected and are deterministically integrated into the hybrid structure waveguides using marker-based electron beam lithography. Moreover, the gate voltage-dependent micro photoluminescence spectra reveal the achievement for tuning individual QD in waveguide systems and spectrally overlying them together. Our work demonstrates the high potential of deterministic quantum device processing for the scalable fabrication of complex quantum integrated circuits with multiple single-photon emitters as an attractive platform for future quantum technologies.