Iris Publishers-Modern Concepts in Material Science


Exciton Quasimolecules and Exciton Quasicrystals: Theory


Material Science

In review, deals with the theory of exciton Quasimolecules in a Nano heterostructures. It has been found that the formation of a exciton Quasimolecules in a Nano heterostructures made up of aluminum oxide quantum dots synthesized in a dielectric matrix is of threshold character and can occur in a Nano systems where the distance D between the surfaces of quantum dots is given by the condition The existence of such distance arises from quantum size effects in which the decrease in the energies of interaction of the electrons and holes entering into the Hamiltonian of the “exciton molecule” with decrease of the distance D between the surfaces of the QD cannot compensate for the increase in the kinetic energy of the electrons and holes. At larger distances D between the surfaces of quantum dots: the biexciton breaks down into two excitons (consisting of spatially separated electrons and holes), localized over QD surfaces.
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