Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 19: Quantum Dots and Wires: Optics I

HL 19.10: Vortrag

Dienstag, 19. März 2024, 12:15–12:30, EW 202

Deterministic nanofabrication of Purcell-enhanced single-photon sources based GaAs quantum dots — •Dinara Basharova¹, Nand Lal Sharma², Ching-Wen Shih¹, Chirag Palekar¹, Alexander Kosarev¹, Sven Rodt¹, Sai Abhishikth Dhurjati², Caspar Hopfmann², and Stephan Reitzenstein¹ — ¹Institute of Solid State Physics, Technische Universität Berlin, D-10623 Berlin, Germany — ²Leibniz Institute for Solid State and Materials Research Dresden, 01069 Dresden, Germany

On-demand single-photon and entangled photon pair sources based on semiconductor quantum dots (QDs) have drawn a great attention in the applications of quantum technologies, including quantum networks and computation. In quantum communication networks, quantum repeaters with QDs are necessary to extend the range of communication distance. In our work, we deterministically integrate semiconductor heterostructures with high-quality GaAs quantum dots emitting at 780 nm into circular Bragg grating (CBG) resonators with a gold mirror. Our design exhibits a theoretical photon extraction efficiency above 70% and a Purcell factor exceeding 14. In addition, in combination with reflectance measurement, we optimize the fabrication process to achieve excellent cavity performance. We use marker based electron beam lithography (EBL) as precise deterministic nanofabrication technique. The fabricated quantum light sources are characterized by high-resolution cathodoluminescence, micro-photoluminescence, and quantum optical spectroscopy, showing multi-photon emission suppression with g(2)(0) = 93%.

Keywords: Quantum Dots; Circular Bragg Grating; Electron Beam Lithography; Heterostructures