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.
Evidence of correlation in spin excitations of few-electron quantum dots / Garcia, Cp; Pellegrini, V; Pinczuk, A; Rontani, M; Goldoni, Guido; Molinari, Elisa; Dennis, Bs; Pfeiffer, Ln; West, Kw. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 95:(2005), pp. 2668061-2668064. [10.1103/PhysRevLett.95.266806]
Evidence of correlation in spin excitations of few-electron quantum dots
GOLDONI, Guido;MOLINARI, Elisa;
2005
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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