title: 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.
authors.affiliation: Centre de Physique Moléculaire Optique et Hertzienne, Université de Bordeaux and CNRS, 351 cours de la Libération, Talence, F-33405, France.
authors.forename: L
authors.initials: L
authors.lastname: Biadala
authors.forename: Y
authors.initials: Y
authors.lastname: Louyer
authors.forename: Ph
authors.initials: P
authors.lastname: Tamarat
authors.forename: B
authors.initials: B
authors.lastname: Lounis