Numerical study of the electronic conduction of double-stranded DNA Molecule:a Fibonacci model

During the last few years, many studies have been devoted to the understanding of the conduction properties of electrode-(single)molecule-electrode systems in the framework of molecular electronics [1-4]. The single molecules with semiconducting behavior play an important role in the development of these systems for electronic applications. The discovery that Deoxyribose Nucleic Acid (DNA) can conduct an electrical current has made it an interesting candidate for the roles that nature did not intend for this molecule. In particular, DNA could be useful in nanoelectronics for design of electric circuits, which could help to overcome the limitations that silicon-based electronics is facing in the recent years. In this work, a numerical study is presented to investigate the electronic conduction properties of DNA molecule in metal/DNA/metal structure. Based on tightbinding Hamiltonian model and within the framework of a generalized Green’s function technique, we considera ladder model for poly(GACT)-poly(CGTA) DNA molecule in metal/DNA/metal structure. Also a Fibonacci model is suggested for poly(GACT)-poly(CGTA) and then the current-voltage characteristic of the system is numerically calculated. Our results show that, within the Fibonacci model, the energy band gaps of DNA molecule in the foregoing structure are filled and the room temperature I-V characteristic of the system shows alinear and ohmic-like behavior