Trasnporte eletrônico em sistemas nanoscópicos desordenados

Abstract

This work has as objective to analize regimes of electronic transport of unidimensionals conducting nanowires in the presence of two types of disorder, structural and composicional. We describe the nanowire using a simplified model for its electronic structure, where atoms of different materials are represented by different values of potential energy. The nanowire disordered part is represented, then, for a sequence of potential barriers. The wire conductance is directly related to the transmission coefficient of an electron, which can be obtained from the solution of the system’s Schrödinger equation. The different transport regimes analysis is made through the calculation of the transmission coefficients distribution of ensembles of wires. The results shows the transition between different regimes of transport due to variation of system determined parameters, such as the disorder degree and the wire disordered section length.