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Band-Edge Exciton Fine Structure of Single CdSe-ZnS Nanocrystals in External Magnetic Fields

Abstract : We report a spectroscopic study of the two lowest-energy exciton levels of individual CdSe-ZnS nanocrystals under applied magnetic fields. Field-induced coupling between the bright and the dark excitonic states is directly observed in the low-temperature photoluminescence spectrum and decay and allows the determination of the angle between the nanocrystal c axis and the field. Orientation-dependent Zeeman splittings of the dark and bright exciton sublevels are measured and provide the corresponding exciton Landé factors, as well as spin-flip relaxation rates between Zeeman sublevels.
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https://hal.archives-ouvertes.fr/hal-00611555
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Submitted on : Tuesday, July 26, 2011 - 3:31:33 PM
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Louis Biadala, Yann Louyer, Philippe Tamarat, Brahim Lounis. Band-Edge Exciton Fine Structure of Single CdSe-ZnS Nanocrystals in External Magnetic Fields. Physical Review Letters, American Physical Society, 2010, 105, pp.157402. ⟨10.1103/PhysRevLett.105.157402⟩. ⟨hal-00611555⟩

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