Resonant energy transfer in quantum dots: Frequency-domain luminescent spectroscopy

The resonant energy transfer due to weak electrostatic interaction in a system of two quantum dots has been theoretically investigated. The probability of this process in the case of a direct-gap semiconductor has been calculated assuming that the interaction between the quantum dot donor electrons and the quantum dot acceptor electrons is described by a screened Coulomb potential. This allows one to consider all the important multipole terms of the interaction and to correctly analyze the dipole-forbidden transitions. It has been found that the energy transfer from the donor to the dipole-forbidden states of the acceptor plays an essential role in the process. The anisotropy and temperature dependence of the energy transfer have been analyzed. Analytical expressions for the luminescent spectra of two interacting quantum dots experiencing resonant energy transfer have been derived.