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Son, Jae Sung
Nanomaterials Science and Engineering Lab (NSE)
Research Interests
  • Nanoparticle, 3D printing, Thermoelectrics, Electronics

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Giant Zeeman splitting in nucleation-controlled doped CdSe:Mn2+ quantum nanoribbons

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Title
Giant Zeeman splitting in nucleation-controlled doped CdSe:Mn2+ quantum nanoribbons
Author
Yu, Jung HoLiu, XinyuKweon, Kyoung EunJoo, JinPark, JiwonKo, Kyung-TaeLee, DongWonShen, ShaopingTivakornsasithorn, KritsanuSon, Jae SungPark, Jae-HoonKim, Young-WoonHwang, Gyeong S.Dobrowolska, MargaretFurdyna, Jacek K.Hyeon, Taeghwan
Keywords
Cation exchange reactions; Diluted magnetic semiconductors; Diverse applications; Doping process; Doping strategies; Effective g-factor; Giant Zeeman splitting; Manganese ions; Nano scale; Nanoribbons; Nucleation stages; Semiconductor nanocrystals; Spintronic applications; Zeeman splittings Engineeri
Issue Date
2010-01
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE MATERIALS, v.9, no.1, pp.47 - 53
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 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.
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DOI
10.1038/NMAT2572
ISSN
1476-1122
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MSE_Journal Papers
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