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Impact of phonons on dephasing of individual excitons in deterministic quantum dot microlenses

Jakubczyk, Tomasz, Delmonte, Valentin, Fischbach, Sarah, Wigger, Daniel, Reiter, Doris E., Mermillod, Quentin, Schnauber, Peter, Kaganskiy, Arsenty, Schulze, Jan-Hindrik, Strittmatter, André, Rodt, Sven, Langbein, Wolfgang Werner, Kuhn, Tilmann, Reitzenstein, Stephan and Kasprzak, Jacek 2016. Impact of phonons on dephasing of individual excitons in deterministic quantum dot microlenses. ACS Photonics 3 (12) , pp. 2461-2466. 10.1021/acsphotonics.6b00707

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Optimized light–matter coupling in semiconductor nanostructures is a key to understand their optical properties and can be enabled by advanced fabrication techniques. Using in situ electron beam lithography combined with a low-temperature cathodoluminescence imaging, we deterministically fabricate microlenses above selected InAs quantum dots (QDs), achieving their efficient coupling to the external light field. This enables performing four-wave mixing microspectroscopy of single QD excitons, revealing the exciton population and coherence dynamics. We infer the temperature dependence of the dephasing in order to address the impact of phonons on the decoherence of confined excitons. The loss of the coherence over the first picoseconds is associated with the emission of a phonon wave packet, also governing the phonon background in photoluminescence (PL) spectra. Using theory based on the independent boson model, we consistently explain the initial coherence decay, the zero-phonon line fraction, and the line shape of the phonon-assisted PL using realistic quantum dot geometries.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Uncontrolled Keywords: coherent nonlinear spectroscopy; electron beam lithography; excitons; four-wave mixing; phonons; quantum dots
Publisher: ACS Publications
ISSN: 2330-4022
Date of First Compliant Deposit: 6 July 2017
Last Modified: 10 Mar 2020 19:15

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