EXCITONS IN SEMICONDUCTOR-DIELECTRIC NANOSTRUCTURES

Confinement in nanostructures with (some of the) linear dimensions sma ll compared to the exciton radius provides a possibility of enhancemen t of both the binding energy and the oscillator strength of excitons. Moreover in such structures the possibility arise of controlling the s trength of Coulomb interaction, responsible for binding of electron an d hole to the exciton, by combining materials for the structure with e ssentially different values of dielectric constants. Transformations o f Wannier-Mott excitons which are dependent on both of these factors - confinement geometry and dielectric constants ratio -, their optical manifestations and similar trends in many body phenomena, including el ectron-hole liquid formation, will be discussed.