ABSTRACT
This chapter reviews the dark/bright exciton model that describes the fine structure of the band-edge exciton in nanometer-size crystallites of direct-gap semiconductors with a cubic lattice structure or a hexagonal lattice structure, which can be described within the framework of a quasicubic model. It summarizes the results of realistic multiband calculations of the band-edge exciton fine structure in quantum dots of semiconductors having a degenerate valence band. The chapter describes the effect of an external magnetic field on the fine structure, the transition oscillator strengths, and polarization properties of cadmium selenide nanocrystals. It discusses the effect of an external magnetic field on the fine level structure and transition oscillator strengths. The chapter considers the polarization properties of the nanocrystals photoluminescence (PL), Stokes shift of the resonant PL, field-induced shortening of the dark exciton lifetime, magnetocircular dichroism, and PL polarization in strong magnetic fields within the developed theoretical model.
