Emission spectra from Coulomb-coupled quantum dot in the n–nn–n junction

The exact expression for the spontaneous emission spectra from the Coulomb-coupled quantum dots embedded in n–nn–n junction quantum dot has been obtained. All resonance mechanisms involving in the system have been classified into two classes, intra-resonance and inter-resonance mechanisms. It is found that the resonance mechanisms dominating the emission spectra experiences transitions from intra-resonance, coexistence of the inter- and intra-resonance, to inter-resonance with the increasing of the electron occupation number in the second quantum dot.