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

Abstract

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.

arXiv comment8 pages, 5 figures

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• Influence of quantum dot geometry on p-shell transitions in differently charged quantum dots
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• Selection rules for the excitation of quantum dots by spatially structured light beams -- Application to the reconstruction of higher excited exciton wave functions
• Selection Rules for Non-Radiative Carrier Relaxation Processes in Semiconductor Quantum Dots
• The excited spin-triplet state of a charged exciton in quantum dots
• Energy spectrum of confined positively charged excitons in single quantum dots
• Magneto-optics of a charge-tunable quantum dot: Observation of a negative diamagnetic shift