Resonant optical excitation of longitudinal-optical phonons and intermixing in InAsAlAs single quantum dots

Sarkar, D.; Van Der Meulen, H.P.; Calleja, J.M.; Meyer, J.M.; Haug, Rolf J.; Pierz, Klaus

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Sarkar, D.; Van Der Meulen, H.P.; Calleja, J.M.; Meyer, J.M.; Haug, R.J.; Pierz, K.: Resonant optical excitation of longitudinal-optical phonons and intermixing in InAsAlAs single quantum dots. In: Applied Physics Letters 92 (2008), Nr. 18, 181909. DOI: https://doi.org/10.1063/1.2920441

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Abstract:
Excitations of a single InAsAlAs self-assembled quantum dot were investigated by photoluminescence excitation spectroscopy. Resonant absorption by longitudinal-optical (LO) phonons of the quantum dot and the barriers is observed. In particular, a resonance at 41 meV is attributed to the AlAs-like mode of InAlAs with low Al content. Our results represent a direct optical measure of the intermixing (estimated below 10%) in a single quantum dot. They also demonstrate that all LO phonons of this mixed quantum dot system couple to the exciton states. © 2008 American Institute of Physics.
License of this version:	Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
Publication type:	Article
Publishing status:	publishedVersion
Publication date:	2008
Keywords english:	Absorption spectra, Excited states, Phonons, Photoexcitation, Photoluminescence spectroscopy, Resonance, Semiconducting indium compounds, Intermixing, Photoluminescence excitation spectroscopy, Resonant absorption, Resonant optical excitation, Single quantum dots, Semiconductor quantum dots
DDC:	530 \| Physik