In photoluminescence spectra of symmetric [111] grown GaAs/AlGaAs quantum dots in longitudinal magnetic fields applied along the growth axis, we observe in addition to the expected bright states also nominally dark transitions for both charged and neutral excitons. We uncover a strongly nonmonotonic, sign-changing field dependence of the bright neutral exciton splitting resulting from the interplay between exchange and Zeeman effects. Our theory shows quantitatively that these surprising experimental results are due to magnetic-field-induced ±3/2 heavy-hole mixing, an inherent property of systems with C3v point-group symmetry.

Original languageEnglish
Article number166604
JournalPhysical Review Letters
Volume107
Issue number16
DOIs
StatePublished - 14 Oct 2011

    Scopus subject areas

  • Physics and Astronomy(all)

ID: 36375295