Evidence of correlation in spin excitations of few-electron quantum dots.
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.
García
César Pascual
CP
NEST CNR-INFM and Scuola Normale Superiore, Pisa, Italy.
Pellegrini
Vittorio
V
Pinczuk
Aron
A
Rontani
Massimo
M
Goldoni
Guido
G
Molinari
Elisa
E
Dennis
Brian S
BS
Pfeiffer
Loren N
LN
West
Ken W
KW