Tuneable paramagnetic susceptibility and exciton g-factor in Mn-doped PbS colloidal nanocrystals

Turyanska, L. and Hill, R.J.A. and Makarovsky, O. and Moro, F. and Knott, A.N. and Larkin, O.J. and Patanè, A. and Meaney, A. and Christianen, P.C.M. and Fay, M.W. and Curry, R.J. (2014) Tuneable paramagnetic susceptibility and exciton g-factor in Mn-doped PbS colloidal nanocrystals. Nanoscale, 6 . pp. 8919-8925. ISSN 2040-3372

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Abstract

We report on PbS colloidal nanocrystals that combine within one structure solubility in physiological solvents with near-infrared photoluminescence, and magnetic and optical properties tuneable by the controlled incorporation of magnetic impurities (Mn). We use high magnetic fields (B up to 30 T) to measure the magnetization of the nanocrystals in liquid and the strength of the sp-d exchange interaction between the exciton and the Mn-ions. With increasing Mn-content from 0.1% to 7%, the mass magnetic susceptibility increases at a rate of ~ 10-7 m3/kg per Mn percentage; correspondingly, the exciton g-factor decreases from 0.47 to 0.10. The controlled modification of the paramagnetism, fluorescence and exciton g-factor of the nanocrystals is relevant to the implementation of these paramagnetic semiconductor nanocrystals in quantum technologies ranging from quantum information to magnetic resonance imaging.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1039/C4NR02336F
Depositing User: Hill, Richard
Date Deposited: 21 Apr 2017 11:02
Last Modified: 23 Apr 2017 04:15
URI: http://eprints.nottingham.ac.uk/id/eprint/42082

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