Dark-bright mixing of interband transitions in symmetric semiconductor quantum dots

Details Dark-bright mixing of interband transitions in symmetric semiconductor quantum dots Dark-bright mixing of interband transitions in symmetric semiconductor quantum dots

2011-06-30

arxiv.org/abs/1106.6182v1

Physical Review Letters 107, 166604 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

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 non-monotonous, 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 \pm 3/2 heavy-hole mixing, an inherent property of systems with C_3v point-group symmetry.

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