Optical study of electron-electron exchange interaction in CdTe/ZnTe quantum dots
Abstract
We present an experimental study of electron-electron exchange interaction in self-assembled CdTe/ZnTe quantum dots based on the photoluminescence measurements. The character and strength of this interaction are obtained by simultaneous observation of various recombination channels of a doubly negatively charged exciton, including previously unrecognized emission lines related to the electron-singlet configuration in the final state. A typical value of the electron singlet-triplet splitting, which corresponds to the exchange integral of electron-electron interaction, has been determined as 20.4 meV with a spread of 1.4 meV across the wide population of quantum dots. We also evidence an unexpected decrease of energy difference between the singlet and triplet states under a magnetic field in Faraday geometry.
Cite
@article{arxiv.1304.5914,
title = {Optical study of electron-electron exchange interaction in CdTe/ZnTe quantum dots},
author = {T. Kazimierczuk and T. Smoleński and J. Kobak and M. Goryca and W. Pacuski and A. Golnik and K. Fronc and Łukasz Kłopotowski and P. Wojnar and P. Kossacki},
journal= {arXiv preprint arXiv:1304.5914},
year = {2015}
}