Phase controlled swapping effect in electron transport through asymmetric parallel coupled quantum dot system

摘要

We present a theoretical study of the role of asymmetry and magnetic flux on electronic transport through various configurations of coupled quantum dot system, by using Non-Equilibrium Green Function formalism. Transport properties (Transmission Probability, Current-Voltage Characteristics and Differential Conductance) of the different configurations of coupled quantum dot system have been studied by self-consistent approach, in the presence of on-dot Coulomb interaction. Fano effect, appearing in Transmission probability, has been explored during transition of the system from series to symmetric parallel configuration and in response to the variation in magnetic flux threading the system. The results show Fano peaks for asymmetric and symmetric parallel configurations. By adjusting the magnetic flux, swapping effect in fano peaks appears due to the exchange of states, which sustains despite strong Coulomb blockade effect. The transmission probability spectrum shows mirror symmetry whenever the sum of two values of magnetic flux threading the system is 2 pi. (C) 2015 Elsevier B.V. All rights reserved.