title: Giant Excitonic Exchange Splittings at Zero Field in Single Colloidal CdSe Quantum Dots Doped with Individual Mn2+Impurities.
abstract: Replacing a single atom of a host semiconductor nanocrystal with a functional dopant can introduce completely new properties potentially valuable for "solotronic" information-processing applications. Here, we report successful doping of colloidal CdSe quantum dots with a very small number of manganese ions-down to the ultimate limit of one. Single-particle spectroscopy reveals spectral fingerprints of the spin-spin interactions between individual dopants and quantum-dot excitons. Spectrally well-resolved emission peaks are observed that can be related to the discrete spin projections of individual Mn2+ions. In agreement with theoretical predictions, the exchange splittings are enhanced by more than an order of magnitude in these quantum dots compared to their epitaxial counterparts, opening a path for solotronic applications at elevated temperatures.
authors.affiliation: Werkstoffe der Elektrotechnik and CENIDE, University Duisburg-Essen , Bismarckstr. 81, Duisburg, 47057 Germany.|Department of Chemistry, University of Washington , Seattle, Washington 98195-1700, United States.
authors.forename: Rachel
authors.initials: R
authors.lastname: Fainblat
authors.affiliation: Department of Chemistry, University of Washington , Seattle, Washington 98195-1700, United States.
authors.forename: Charles J
authors.initials: CJ
authors.lastname: Barrows
authors.affiliation: Werkstoffe der Elektrotechnik and CENIDE, University Duisburg-Essen , Bismarckstr. 81, Duisburg, 47057 Germany.
authors.forename: Eric
authors.initials: E
authors.lastname: Hopmann
authors.affiliation: Werkstoffe der Elektrotechnik and CENIDE, University Duisburg-Essen , Bismarckstr. 81, Duisburg, 47057 Germany.
authors.forename: Simon
authors.initials: S
authors.lastname: Siebeneicher
authors.affiliation: Department of Chemistry, University of Washington , Seattle, Washington 98195-1700, United States.
authors.forename: Vladmir A
authors.initials: VA
authors.lastname: Vlaskin
authors.affiliation: Department of Chemistry, University of Washington , Seattle, Washington 98195-1700, United States.
authors.forename: Daniel R
authors.initials: DR
authors.lastname: Gamelin
authors.affiliation: Werkstoffe der Elektrotechnik and CENIDE, University Duisburg-Essen , Bismarckstr. 81, Duisburg, 47057 Germany.
authors.forename: Gerd
authors.initials: G
authors.lastname: Bacher
keywords: Nanocrystal; diluted magnetic semiconductors; giant Zeeman splitting; photoluminescence; single particle; solotronics