Optical control of energy-level structure of few electrons in AlGaAs/GaAs quantum dots |
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Authors: | Kalliakos Sokratis Pellegrini Vittorio Garcia Cesar Pascual Pinczuk Aron Pfeiffer Loren N West Ken W |
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Affiliation: | NEST INFM-CNR and Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy. |
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Abstract: | Optical control of the lateral quantum confinement and number of electrons confined in nanofabricated GaAs/AlGaAs quantum dots is achieved by illumination with a weak laser beam that is absorbed in the AlGaAs barrier. Precise tuning of energy-level structure and electron population is demonstrated by monitoring the low-lying transitions of the electrons from the lowest quantum-dot energy shells by resonant inelastic light scattering. These findings open the way to the manipulation of single electrons in these quantum dots without the need of external metallic gates. |
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