Terahertz Response of an Interacting Confined Electron-Hole Pair

Terahertz conductivity spectra of nanostructures contain valuable information relevant for the design of new devices. Contemporary models for interpretation of data usually treat charge carriers as independent. However, due to spatial confinement of charge carriers, Coulomb interaction plays an important role in nanostructures, inducing correlation between the carriers. We develop a model of a confined electron-hole pair, and we show a significant change in the predicted spectra when Coulomb interaction is accounted for. The impact of this effect is universal for all nanostructures.