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HL: Halbleiterphysik

HL 57: Theory of electronic structure

HL 57.2: Vortrag

Freitag, 31. März 2006, 11:15–11:30, BEY 118

Excitons in stackes of ZnSe/CdSe quantum dots — •Tchelidze Tamar — Tbilisi State University, Department of Exact and Natural Sciences, Chavchavadze Ave.3 0218 Tbilisi Georgia

We investigated electron hole interaction in the flat 2D-quantum dot heterostructures with arbitrary number of stacked quantum dot layers. The calculation were carried out on the basic of obtained recurrent formula, which derives single particle energies and wave functions of electrons and holes in quantum dot heterostructures with n stacked layers from the single particle energies and wave functions for heterostructure with n-1 stacked layers. Interaction of electrons and holes were considered by means of direct diagonalizing of Hamiltonian matrix. We studied the dependence of exciton binding energy, probabilities of optical transitions in dependence on quantum dot and barrier layer size, as well as on the number of stacked layers. We have investigated the influence of impurities on the electron-hole Coulomb interaction in single and double stacks of quantum dots. We studied how the presence of one-charged donor and acceptor impurities affects on the exciton binding energy and probability of radiation decay in the flat 2D-quantum dots and quantum dot molecules.