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- ItemElectronic states in a quantum well - nanobridge - quantum dot structure(Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik, 2013) Racec, Paul N.; Goray, Leonid I.Using the finite volume method we compute within effective mass approximation the single-particle eigenstates for electrons and holes in a InGaAs/GaAs quantum well - nanobridge - quantum dot structure. It is shown that hybrid states appear in this complex system. The interaction between the eigenvalues may be an explanation for the additional photoluminescence peak measured for inverted structures with smaller nanobridge lengths.
- ItemQuantum transport in cylindrical semiconductor nanowires with constrictions(Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik, 2013) Racec, Paul N.The energy dependence of the tunneling coeffcient for a cylindrical semiconductor nanowire, i.e. a one-dimensional electron gas, with one or two constrictions is studied. Using the R-matrix formalism the localization probabilities at the resonant energies can be computed. They give decisive information about the physical meaning of the resonant peaks and dips that appear. The nanowire with two constrictions yields a well-defined system for the experimental evidence of the quasi-bound states of the evanescent channels. Clearly marked dips due to them should appear in the linear conductance at low temperatures.