Kondo-excitons and Auger processes in self-assembled quantum dots

摘要

We describe theoretically novel excitons in self-assembled quantum dots intereacting with a two-dimensional (2D) electron gas in the wetting layer.In the presence of the Fermi sea,the optical lines become strongly voltage-dependent.If the electron spin is nonzer,the width of optical lines is given by K_bT_K,where T_K is Kondo temperature.If the spin is zero,the exciton couples with the continuum due to Auger-like processes.This leads to anticrossing in a magnetic field.Such states can be called Kondo-Anderson excitons.Some of the described phenomena are observed in recent experiments.