Spectroscopy of few-electron collective excitations in charge-tunable artificial atoms |
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Authors: | Brocke T Bootsmann M-T Tews M Wunsch B Pfannkuche D Heyn Ch Hansen W Heitmann D Schüller C |
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Institution: | Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universit?t Hamburg, Jungiusstrasse 11, D-20355 Hamburg, Germany. |
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Abstract: | We report the investigation of electronic excitations in InGaAs self-assembled quantum dots using resonant inelastic light scattering. The dots can be charged via a gate by N=1, em leader,6 electrons. We observe excitations, which are identified as transitions of electrons, predominantly from the s to the p shell (s-p transitions) of the quasiatoms. We find that the s-p transition energy decreases and the observed band broadens, when the p shell is filled with 1 to 4 electrons. By a theoretical model, which takes into account the full Coulomb interaction in the few-electron artificial atom, we can confirm the experimental results to be an effect of the Coulomb interaction in the quantum dot. |
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