Multi-exciton spectroscopy on a self-assembled InGaAs/GaAs quantum dot |
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Authors: | F Findeis A Zrenner M Markmann G Bhm G Abstreiter |
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Institution: | F. Findeis, A. Zrenner, M. Markmann, G. Böhm,G. Abstreiter |
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Abstract: | We report about spatially resolved magneto-optical experiments on a self-assembled InGaAs quantum dot. Using electron beam lithograpy for patterning a metal shadow mask we can isolate a single dot. This allows us to study the optical response of a single dot as a function of excitation power and magnetic field. We investigate the influence of many body interaction in the emission spectra for different exciton occupation numbers of the dot. The diamagnetic/orbital shift as well as Zeeman splitting in a magnetic field can be fully resolved and are used to identify the observed emission lines. Further we report on absorption properties of the quantum dot as a function of magnetic field. We analyse in detail the phonon-assisted absorption process connected with the GaAs LO-phonon 36 meV above the single-exciton ground state. |
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Keywords: | Self-assembled quantum dots Single-dot spectroscopy Magneto-spectroscopy Resonant Raman scattering |
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