Effect of electron-electron interaction on linear and nonlinear optical phenomena in quantum dot systems in interlevel resonance region

We theoretically investigate linear and nonlinear optical phenomena in quantum dot (QD) systems caused by interlevel transitions. Effect of electron-electron (e-e) interaction in the systems on the optical phenomena is in the focus of the work. The e-e interaction is taken into account by employing the self-consistent field approach in the quasistatic limit. We show that presence of metal surface, and especially another resonant system, can dramatically enhance the effect of the e-e interaction on the optical phenomena. We discuss the conditions for the intrinsic optical bistability in QD systems caused by the e-e interaction. The obtained results can find applications for design, fabrication, and exploiting nanooptoelectronics devices, in part, all-optical components like QD-based optical switches and optical transistors.