Manipulation of the electric state of the CdSe/ZnSe QD with a single Fe2+ dopant

The source data file for a publication: "Manipulation of the electric state of the CdSe/ZnSe QD with a single Fe2+ dopant".The experimental data are provided as .txt and .dat files and can be readily analyzed using common scientific software such as Origin or Matlab. The source data for each figure are stored in separate folders labeled according to the corresponding figure number. Data for Figures 2–6 are organized in a matrix format: the first row contains the Y-axis values, the first column of the remaining matrix corresponds to the X-axis values, and the remaining entries represent the measured amplitude values.Abstract:We demonstrate electrical control over the charge state of a CdSe/ZnSe quantum dot doped with a single Fe2+ ion, enabling precise tuning of excitonic configurations and the determination of exchange interactions between the magnetic dopant and selected confined excitonic complexes. Using polarization-resolved magnetophotoluminescence spectroscopy, we systematically investigated the spin-dependent coupling between Fe2+ and individual carriers across various excitonic charge states. By applying an external voltage, we stabilized neutral, negatively charged, and positively charged excitons, allowing controlled interaction with specific types and numbers of carriers. This electrical tunability offers new insights into exchange interactions manifesting optically as characteristic anticrossings and spin-dependent splittings in a magnetic field. These features enable the identification of excitonic complexes states, including multicharged species. Our findings establish a plug-and-play platform for manipulating spin interactions at the single ion-carrier level, advancing the development of electrically controlled solotronic devices and carrier-selective quantum information processing.