Effect of radiation on the electronic transport through polyacetylene-based junctions

A theoretical study is presented to investigate the electronic transport properties of polyacetylene-based junctions irradiated by time-dependent electromagnetic field (EF). Making use of tight-binding procedure and within the framework of time-dependent Green's function formalism, the current–voltage (I–V) characteristics of trans  -PA molecule and the electronic transmission through the junction are studied. At low temperatures, our results indicate the EF causes a broad tail inside the gap region and induces the extended electronic states in the band gap of the molecule give rise to the enhancement of the hopping conduction through the junction. Furthermore, the size of the molecular gap is proportional to the incident angles of radiation and at the incident angles between θ=30∘θ=30∘ and θ=45∘θ=45∘ the band gap of the molecule suppressed and the I–V characteristics show metallic-like behavior.