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