Flux induced fano peak splitting in asymmetric coupled quantum dot system

Abstract

Non-equilibrium Green function formulism and equation of motion approach has been used to study the electron transport through coupled quantum dot (CQD) system in the presence of intra-dot coulomb interaction. With focus on quantum interference, an obvious Fano interference is readily observed in the conduction spectrum of CQD system. In this paper the possibility of manipulating the Fano line shape in the tunneling spectra of CQD system is being explored by tuning the magnetic flux threading the CQD system and leads. The role of asymmetric coupling during transition from series configuration to parallel one is observed to be magnetic flux dependent. Absence of Fano effect in series CQD system and presence of Fano effect in the symmetric parallel CQD in the presence of magnetic flux is the main hallmark of this paper.