Abstract
We propose an analytical model to describe the electronic transport properties of a uniform chain including one or two on-site impurities located at arbitrary sites by using Green’s function technique within the tight-binding approach. We reduce some quasi one-dimensional periodic quantum wires to uniform chains including one or two effective on-site impurities with help of the renormalization procedure. Then, we employ the formalism to drive their electronic conductance analytically. For some interesting configurations, we provide a list for on-site energies of effective impurities and all needed quantities. Some defects in a conjugated polymer can also be described by the effective on-site impurities when the system is reduced into a uniform chain.
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