ELECTRON-HOLE EXCHANGE INTERACTION IN THE NON-CONCENTRIC SPHERICAL CORE-SHELL QUANTUM DOT

Abstract

In this work we investigated the effect of the non-concentricity parameter on the magnitude of the exciton dark-light splitting in spherical non-concentric CdSe/CdS core-shell quantum dots. Quantum dots with both narrow and wide shells have been investigated. It has been shown that as the shell radius increases, the exchange interaction energy decreases and the exciton dark-light splitting decreases too. However, with fixed core and shell sizes, the core displacement from the common center leads to a monotonic increase in the exchange interaction for small shell radii and to a non-monotonic increase for larger shell radii. The obtained results are consistent with experimental data.