Negative circular polarization as a universal property of quantum dots

This paper shows that negative circular polarization, a spin flip of polarized carriers resulting in emission of opposite helicity, can be observed in undoped, n-doped, and p-doped InAs/GaAs quantum dots. These results contradict the usual interpretation of the effect. We show using power dependent...

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Veröffentlicht in:Applied physics letters 2015-03, Vol.106 (12)
Hauptverfasser: Taylor, Matthew W., Spencer, Peter, Murray, Ray
Format: Artikel
Sprache:eng
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Zusammenfassung:This paper shows that negative circular polarization, a spin flip of polarized carriers resulting in emission of opposite helicity, can be observed in undoped, n-doped, and p-doped InAs/GaAs quantum dots. These results contradict the usual interpretation of the effect. We show using power dependent and time resolved spectroscopy that the generation of negative circular polarization correlates with excited state emission. Furthermore, a longer spin lifetime of negatively polarized excitons is observed where emission is largely ground state in character.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4916370