Giant Zeeman splitting in nucleation-controlled doped CdSe:Mn2+ quantum nanoribbons
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- Giant Zeeman splitting in nucleation-controlled doped CdSe:Mn2+ quantum nanoribbons
- Yu, Jung Ho; Liu, Xinyu; Kweon, Kyoung Eun; Joo, Jin; Park, Jiwon; Ko, Kyung-Tae; Lee, DongWon; Shen, Shaoping; Tivakornsasithorn, Kritsanu; Son, Jae Sung; Park, Jae-Hoon; Kim, Young-Woon; Hwang, Gyeong S.; Dobrowolska, Margaret; Furdyna, Jacek K.; Hyeon, Taeghwan
- 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
- NATURE PUBLISHING GROUP
- NATURE MATERIALS, v.9, no.1, pp.47 - 53
- 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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