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NEST Scientific Report 2007-2009 Probing collective modes of correlated states of few electrons in quantum dots
 

Summary: NEST Scientific Report 2007-2009
Probing collective modes of correlated states of few electrons in quantum dots
39
L
ow-lying collective excitations above highly correlated ground states of few interacting
electrons confined in GaAs quantum dots (QDs) are probed by resonant inelastic
light scattering. We highlight that separate studies of the changes in the spin and
charge degrees of freedom offer unique access to the fundamental interactions. The case
of QDs with four electrons is found to be determined by a competition between triplet and
singlet ground states that is uncovered in the rich light scattering spectra of spin excitations.
These light scattering results are described within a configuration-interaction framework
that captures the role of electron correlation with quantitative accuracy. In these studies,
inelastic light scattering methods emerge as powerful probes of collective phenomena and
spin configurations in QDs.
Despite the large body of theoretical
studies of the roles of correlation in
QDs [1,2], probing experimentally the
fundamental interactions underlying the
emergence of a collective correlated
state of few electrons in a QD represents

  

Source: Abbondandolo, Alberto - Scuola Normale Superiore of Pisa

 

Collections: Mathematics