Excitation spectroscopy of single quantum dots at tunable positive, neutral, and negative charge states

We present a comprehensive study of the optical transitions and selection rules of variably charged single self-assembled InAs/GaAs quantum dots. We apply high resolution polarization sensitive photoluminescence excitation spectroscopy to the same quantum dot for three different charge states: neutr...

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Veröffentlicht in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-08, Vol.86 (8), Article 085306
Hauptverfasser: Benny, Y., Kodriano, Y., Poem, E., Gershoni, D., Truong, T. A., Petroff, P. M.
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Sprache:eng
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Zusammenfassung:We present a comprehensive study of the optical transitions and selection rules of variably charged single self-assembled InAs/GaAs quantum dots. We apply high resolution polarization sensitive photoluminescence excitation spectroscopy to the same quantum dot for three different charge states: neutral and negatively or positively charged by one additional electron or hole. From the detailed analysis of the excitation spectra, a full understanding of the single-carrier energy levels and the interactions between carriers in these levels is extracted for the first time.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.86.085306