Non-linear two-photon resonance fluorescence on a single artificial atom

• Published in: arXiv.org
• Main Authors: P -L Ardelt, Koller, M, Simmet, T, Hanschke, L, Bechtold, A, Regler, A, Wierzbowski, J, Riedl, H, Müller, K, Finley, J J
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 02.11.2015
• Subjects: Excitation; Matter & antimatter; Nonlinear response; Physics - Mesoscale and Nanoscale Physics; Quantum dots; Rabi frequency; Resonance fluorescence
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1511.00503

We report two-photon resonance fluorescence of an individual semiconductor artificial atom. By non-linearly driving a single quantum dot via a two-photon transition, we probe the linewidth of the two-photon processes and show that, similar to their single-photon counterparts, they are close to being Fourier limited at low temperatures. The evolution of the population of excitonic states with the Rabi frequency exhibits a clear s-shaped behavior, indicative of the non-linear response via the two-photon excitation process. We model the non-linear response using a 4-level atomic system representing the manifold of excitonic and biexcitonic states of the quantum dot and show that quantitative agreement is obtained only by including the interaction with LA-phonons in the solid state environment. Finally, we demonstrate the formation of dressed states emerging from a two-photon interaction between the artificial atom and the excitation field. The non-linear optical dressing induces a mixing of all four excitonic states that facilitates the tuning of the polarization selection rules of the artificial atom.