  We describe theoretically novel excitons in self-assembled quantum dots
interacting with a two-dimensional 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 nonzero, 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 anticrossings in a
magnetic field. Some of the described phenomena are observed in recent
experiments.
