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HL: Fachverband Halbleiterphysik
HL 19: Quantum Dots and Wires: Optics I
HL 19.11: Talk
Tuesday, March 19, 2024, 12:30–12:45, EW 202
Quantum optical properties of resonantly excited semiconductor quantum dots embedded in hybrid circular Bragg Gratings — •Martin von Helversen1, Lucas Rickert1, Daniel Vajner1, Johannes Schall1, Shulun Li1,2, Sven Rodt1, Zhichuan Niu2, Stephan Reitzenstein1, and Tobias Heindel1 — 1Institute of Solid State Physics, Technical University Berlin, Berlin, Germany — 2Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China
Aiming at the efficient on-demand generation of indistinguishable and highly pure single-photons, semiconductor quantum dots have proven excellent candidates - to large extend also due to the vast progress in their integration into photonic cavities. Amongst these, hybrid circular Bragg Gratings (hCBGs) have quickly become a well established choice, due to their broad outcoupling enhancement combined with high Purcell factors. Owed to the possible generation of polarization entangled photons, much research focuses on two-photon-resonant excitation.
In this work, we take advantage of a deterministically integrated QD in a hybrid CBG with a T1-time below 50 ps to study its quantum optical properties under quasi-resonant p-shell as well as resonant s-shell excitation, the latter in continuous wave as well as in the pulsed regime under varying optical pulse-lengths. While purities exceeding 98% are achieved even under p-shell, we observe indistinguishable photons with a non-postselected visibility of over 88% under resonant excitation.
Keywords: Resonance Fluorescence; Quantum Dot; Cirular Bragg Grating