Evidence of correlation in spin excitations of few-electron quantum dots |
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Authors: | García César Pascual Pellegrini Vittorio Pinczuk Aron Rontani Massimo Goldoni Guido Molinari Elisa Dennis Brian S Pfeiffer Loren N West Ken W |
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Institution: | NEST CNR-INFM and Scuola Normale Superiore, Pisa, Italy. |
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Abstract: | We report inelastic light scattering measurements of spin and charge excitations in nanofabricated AlGaAs/GaAs quantum dots with few electrons. A narrow spin excitation peak is observed and assigned to the intershell triplet-to-singlet monopole mode of dots with four electrons. Configuration-interaction theory provides precise quantitative interpretations that uncover large correlation effects that are comparable to exchange Coulomb interactions. |
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