Regensburg 2019 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 33: Quantum light sources

HL 33.7: Talk

Wednesday, April 3, 2019, 16:45–17:00, H34

Chiral light-matter coupling in deterministic quantum dot waveguides — •Paweł Mrowiński¹, Peter Schnauber¹, Arsenty Kaganskiy¹, Philipp Gutsche², Sven Burger², Sven Rodt¹, and Stephan Reitzenstein¹ — ¹Technische Universität Berlin, Hardenbergstraße 36, D-10623 Berlin, Germany — ²Zuse Institute Berlin, Takustraße 7, D-14195 Berlin, Germany

Quantum dots embedded in waveguides can exhibit directional emission or non-reciprocal transmission on a single-photon level via chiral light-matter interactions, which is important for realization of large-scale on-chip quantum circuits [1,2]. In this work, we study directional emission of a single InAs/GaAs quantum dot (QD) in a ridge waveguide (WG) structure with bottom AlGaAs/GaAs DBR mirror (cf. Fig. 1a). The QD is pre-selected and deterministic integrated into the WG by using in-situ electron-beam lithography, as described in [3]. We fabricated a series of WG structures containing single QD varying the in-plane position to explore the position dependence on directional emission. The directional propagation is reflected in the polarization resolved photoluminescence for the outcoupled light influenced by the external magnetic field applied in Faraday configuration. A significant contrast (C) of 90 % is observed for right/left circularly polarized QD emission from charged exciton in case of QD located at highly off-center position, which indicates chiral coupling in this system (cf. Fig 1b). Furthermore, we studied in detail the contrast vs QD position dependence and we obtain agreement with the calculated dependence by Finite Element Method (JCMwave).