Modeling of the Mn-Carrier Exchange Interaction in Colloidal CdSe/CdMnS Nanoplatelets with a Multilayer Core and Magnetically Doped Shell

A Colloidal Nanoplatelet is a two-dimensional semiconductor nanocrystal heterostructure that allows for wavefunction engineering by controlling their composition and or thickness. With the inclusion of a shell doped with magnetic ions around a non-magnetic core, there exists a carrier mediated exchange interaction between the excitonic spin density and the Mn spins. Through the exchange interaction, magnetic effects such as Zeeman splitting and the excitonic photoluminescence circular polarization can be controlled by varying the shell thickness and or Mn content [1,2]. The previous works did not take into account on how the exitonic wavefunction is affected by the addition of the magnetically doped shell. Here, we present a model that includes the carrier mediated exchange interaction and study its effect on the excitonic wavefunction. [1] S. Delikanl et al.,ACS. Nano 2015 9, 12, 12473-12479 [2] F. Muckel et al., Nano Lett. 2018, 18, 2047−2053.