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HL: Fachverband Halbleiterphysik
HL 19: Quantum Dots and Wires: Optics I
HL 19.2: Talk
Tuesday, March 19, 2024, 09:45–10:00, EW 202
Magneto-optical generation and characterization of dark exciton state in a quantum dot — •René Schwarz1, Florian Kappe1, Yusuf Karli1, Thomas Bracht2, Saimon Covre da Silva3, Armando Rastelli3, Vikas Remesh1, Doris Reiter2, and Gregor Weihs1 — 1Institute für Experimentalphysik, Universität Innsbruck, Innsbruck, Austria — 2Condensed Matter Theory, Department of Physics, TU Dortmund, Dortmund, Germany — 3Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Linz, Austria
Semiconductor quantum dots are arguably the most promising platform for future quantum technologies. Due to the confinement of charge carriers, a variety of photon states can be generated, making them a highly adaptable quantum platform. While the most common optical excitation methods target the so-called bright excitons or biexcitons for the generation of single or entangled photon states, quantum dots also accommodate optically dark excitons, which are not directly accessible via optical excitation methods. The dark exciton states exhibit significantly slower decay rates compared to their bright counterparts, making them potential candidates for application in quantum information protocols that demand the control of quantum coherence over long time scales [1]. In this work, we generate the dark exciton states in a single GaAs/AlGaAs quantum dot emitting ~ 800 nm under a magneto-optical excitation (in-plane magnetic field ~ 3.2 T), and characterize the emission energy splitting, lifetime variation and polarization response. [1] Phys. Rev. Lett. 94, 030502 (2005)
Keywords: quantum dots; dark exciton states; single photons; entangled photons