title: Giant Zeeman splitting in nucleation-controlled doped CdSe:Mn2+ quantum nanoribbons.
abstract: Doping of semiconductor nanocrystals by transition-metal ions has attracted tremendous attention owing to their nanoscale spintronic applications. Such doping is, however, difficult to achieve in low-dimensional strongly quantum confined nanostructures by conventional growth procedures. Here we demonstrate that the incorporation of manganese ions up to 10% into CdSe quantum nanoribbons can be readily achieved by a nucleation-controlled doping process. The cation-exchange reaction of (CdSe)(13) clusters with Mn(2+) ions governs the Mn(2+) incorporation during the nucleation stage. This highly efficient Mn(2+) doping of the CdSe quantum nanoribbons results in giant exciton Zeeman splitting with an effective g-factor of approximately 600, the largest value seen so far in diluted magnetic semiconductor nanocrystals. Furthermore, the sign of the s-d exchange is inverted to negative owing to the exceptionally strong quantum confinement in our nanoribbons. The nucleation-controlled doping strategy demonstrated here thus opens the possibility of doping various strongly quantum confined nanocrystals for diverse applications.
authors.affiliation: National Creative Research Initiative Center for Oxide Nanocrystalline Materials and School of Chemical and Biological Engineering, Seoul National University, Seoul 151-744, Korea.
authors.forename: Jung Ho
authors.initials: JH
authors.lastname: Yu
authors.forename: Xinyu
authors.initials: X
authors.lastname: Liu
authors.forename: Kyoung Eun
authors.initials: KE
authors.lastname: Kweon
authors.forename: Jin
authors.initials: J
authors.lastname: Joo
authors.forename: Jiwon
authors.initials: J
authors.lastname: Park
authors.forename: Kyung-Tae
authors.initials: KT
authors.lastname: Ko
authors.forename: Dong Won
authors.initials: DW
authors.lastname: Lee
authors.forename: Shaoping
authors.initials: S
authors.lastname: Shen
authors.forename: Kritsanu
authors.initials: K
authors.lastname: Tivakornsasithorn
authors.forename: Jae Sung
authors.initials: JS
authors.lastname: Son
authors.forename: Jae-Hoon
authors.initials: JH
authors.lastname: Park
authors.forename: Young-Woon
authors.initials: YW
authors.lastname: Kim
authors.forename: Gyeong S
authors.initials: GS
authors.lastname: Hwang
authors.forename: Margaret
authors.initials: M
authors.lastname: Dobrowolska
authors.forename: Jacek K
authors.initials: JK
authors.lastname: Furdyna
authors.forename: Taeghwan
authors.initials: T
authors.lastname: Hyeon