Regensburg 2022 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 19: Materials and Devices for Quantum Technology 1
HL 19.4: Vortrag
Mittwoch, 7. September 2022, 10:30–10:45, H34
Three-dimensional electrical control of the excitonic fine structure for a quantum dot in a cavity — •Martin Esmann1,2, Hélène Ollivier1, Priya Priya1, Abdelmounaim Harouri1, Isabelle Sagnes1, Aristide Lemaître1, Olivier Krebs1, Loic Lanco1, Daniel Lanzillotti-Kimura1, and Pascale Senellart1 — 1Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies (C2N), Palaiseau, France — 2Institut für Physik, Universität Oldenburg, Germany
The excitonic fine structure plays a key role for the quantum light generated by semiconductor quantum dots, both for entangled photon pairs and single photons [1]. Controlling the excitonic fine structure has been demonstrated using electric, magnetic, or strain fields, but not for quantum dots in optical cavities, a key requirement to obtain high source efficiency and near-unity photon indistinguishability [2]. Here, we demonstrate the control of the fine structure splitting for quantum dots embedded in micropillar cavities. We propose and implement a scheme based on remote electrical contacts connected to the pillar cavity through narrow ridges. Numerical simulations show that such a geometry allows for a three-dimensional control of the electrical field. We experimentally demonstrate tuning and reproducible canceling of the fine structure, a crucial step for the reproducibility of quantum light source technology.
[1] P. Senellart, G. Solomon, and A. White, Nature Nanotechnology 12, 1026 (2017). [2] R. Trotta et al. PRL 114, 150502 (2015). [3] H. Ollivier et al. arXiv:2112.00400.