Signatures of Foerster and Dexter transfer processes in coupled nanostructures for linear and two dimensional coherent optical spectroscopy

摘要

In this manuscript, we study the impact of the two Coulomb induced resonance energy transfer processes, Foerster and Dexter coupling, on the spectral signatures obtained by double quantum coherence spectroscopy. We show that the specific coupling characteristics allow us to identify the underlying excitation transfer mechanism by means of specific signatures in coherent spectroscopy. Therefore, we control the microscopic calculated coupling strength of spin preserving and spin flipping Foerster transfer processes by varying the mutual orientation of the two quantum emitters. The calculated spectra reveal the optical selection rules altered by Foerster and Dexter coupling between two semiconductor quantum dots. We show that Dexter coupling between bright and dark two-exciton states occurs.