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Giant Zeeman effects in colloidal diluted magnetic semiconductor quantum dots with homogeneous dopant speciation

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2 Author(s)
Norberg, Nick S. ; Department of Chemistry, University of Washington, Seattle, Washington 98195-1700 ; Gamelin, Daniel R.

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Ligand field electronic absorption and magnetic circular dichroism (MCD) spectroscopies are used to probe Co2+ dopant speciation in ZnO, ZnSe, and CdS nanocrystals and confirm the high quality of these colloidal diluted magnetic semiconductor quantum dots (DMS-QDs). Measurements of the QD giant Zeeman splittings using MCD and Zeeman spectroscopies show no enhancement of N0(α-β) relative to bulk. MCD spectroscopy is also presented as an effective method for verifying the successful synthesis of colloidal DMS-QDs when doping cannot be confirmed by ligand field absorption, highly resolved electron paramagnetic resonance, or other rigorous dopant-specific spectroscopic means.

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Journal of Applied Physics  (Volume:99 ,  Issue: 8 )