García César Pascual, Pellegrini Vittorio, Pinczuk Aron, Rontani Massimo, Goldoni Guido, Molinari Elisa, Dennis Brian S, Pfeiffer Loren N, West Ken W
NEST CNR-INFM and Scuola Normale Superiore, Pisa, Italy.
Phys Rev Lett. 2005 Dec 31;95(26):266806. doi: 10.1103/PhysRevLett.95.266806. Epub 2005 Dec 23.
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.
我们报道了对具有少量电子的纳米制造的AlGaAs/GaAs量子点中自旋和电荷激发的非弹性光散射测量。观察到一个窄的自旋激发峰，并将其归因于具有四个电子的量子点的壳间三重态到单重态单极模式。组态相互作用理论提供了精确的定量解释，揭示了与交换库仑相互作用相当的大关联效应。
