Spectroscopy of Few-Electron Collective Excitations in Charge-Tunable Artificial Atoms

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Erscheinungsjahr:
2003
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Text
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  • 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 [Formula presented] electrons. We observe excitations, which are identified as transitions of electrons, predominantly from the [Formula presented] to the [Formula presented] shell ([Formula presented] transitions) of the quasiatoms. We find that the [Formula presented] transition energy decreases and the observed band broadens, when the [Formula presented] shell is filled with [Formula presented] to [Formula presented] 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. © 2003 The American Physical Society.
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  • info:eu-repo/semantics/closedAccess
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Forschungsinformationssystem der UHH
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oai:www.edit.fis.uni-hamburg.de:publications/379a3a37-85e9-440d-b566-425ecd02f214