Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
The current study invastigates the magneto-optical properties of CdSe/CdMnS core/shell colloidal nanoplatelets (NPs). Replacing a single or a few cations of the host semiconductor nanocrystal with magnetic dopants can introduce completely new properties, which are potentially valuable for a spin-based applications. The NPs consist of a CdSe core, covered by monolayers (MLs) of CdMnS shell, adjusted to quasi-type-II electronic nanostructure. The material design enables the appearance of the dopant excited states to lie nearly in resonance with the band-edge levels of the host semiconductor,thus, inducing a strong sp-d exchange interaction. The magneto-optical properties were investigated by probing the single exciton recombination emission of these NPs, using micro-photoluminescence (μPL) spectroscopy, obtaining an exchange split in the presence of an external magentic field (B0). Well-resolved optically detected magnetic resonance (ODMR) peaks are observed, which can be related to the discrete spin projections of individual Mn2+ ions. The experimental results are supported by a theoretical model, based on the effective mass approximation of the NPs electronic states, perturbed by the relevant exchange interactions: electron-Mn+2, hole- Mn+2 and electron-hole, with a dependence on the core/shell heterostructure design. This allows a calculation of the Mn+2 g-factor, and the evaluation of the electron-hole and exciton-Mn+2 coupling constants.
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