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HL: Fachverband Halbleiterphysik

HL 8: Quantum Dots and Wires 2: Optics 1

HL 8.7: Vortrag

Montag, 5. September 2022, 17:15–17:30, H32

Red Detuned Excitation of a Quantum Dot — •Yusuf Karli¹, Florian Kappe¹, Thomas Bracht², Julian Münzberg¹, Tim Seidelmann³, Vollrath Martin Axt³, Saimon Covre da Silva⁴, Armando Rastelli⁴, Vikas Remesh¹, Doris Reiter⁵, and Gregor Weihs¹ — ¹Institute für Experimentalphysik, Universität Innsbruck, Innsbruck, Austria — ²Institut für Festkörpertheorie, Universität Münster, Münster, Germany — ³Theoretische Physik III, Universität Bayreuth, Bayreuth, Germany — ⁴Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Linz, Austria — ⁵Condensed Matter Theory, Department of Physics, TU Dortmund, Dortmund, Germany

Semiconductor quantum dots have emerged as promising sources of highly indistinguishable single photons. To operate as an on-demand photon source, a quantum dot must be prepared in its exciton state, for which, several protocols exist. A recent remarkable theoretical discovery, also presented at this conference, showed that the exciton state in a quantum dot can be efficiently populated by two red-detuned pulses in a swing-up mechanism. We demonstrate the experimental implementation of this mechanism relying on amplitude-shaping of a broadband laser pulse in a 4f shaper including a spatial light modulator. The decisive advantage of our scheme is that both pulses are red-detuned and therefore, no higher-lying states of the quantum dot will be directly addressed. Our results contribute towards an effortless method for generating high-purity single photons, yet most importantly, removing the need for stringent polarization filtering.