Probing spin states in AlGaAs/GaAs few-electron quantum dots by inelastic light scattering

S. Kalliakos, C. Pascual García, V. Pellegrini, A. Pinczuk, B. S. Dennis, L. N. Pfeiffer, K. W. West, M. Rontani, G. Goldoni, E. Molinari

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Resonant inelastic light scattering provides a venue for the study of spin transitions and interactions in quantum dots (QDs) with few electrons. Here we present the observation of inter-shell excitations in GaAs/AlGaAs nanofabricated QDs containing four electrons. The ground state with four electrons dictated by Hund's rule is a triplet with total spin S = 1 so that peculiar to this configuration there are two monopole inter-shell spin modes with changes ΔS = ±1 that connect the triplet state to the excited states with S = 0 and S = 2, respectively. We present light scattering spectra that offer evidence of these excitations. The light scattering spectra are interpreted by numerical evaluations within a full configuration interaction approach.

Original languageEnglish (US)
Title of host publicationPhysics of Semiconductors - 28th International Conference on the Physics of Semiconductors, ICPS 2006, Part A and B
Pages959-960
Number of pages2
DOIs
StatePublished - 2007
Externally publishedYes
Event28th International Conference on the Physics of Semiconductors, ICPS 2006 - Vienna, Austria
Duration: Jul 24 2006Jul 28 2006

Publication series

NameAIP Conference Proceedings
Volume893
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other28th International Conference on the Physics of Semiconductors, ICPS 2006
Country/TerritoryAustria
CityVienna
Period7/24/067/28/06

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

Keywords

  • Electron correlation
  • Inelastic light scattering
  • Quantum dots

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