Abstract
Tight binding Hamiltonian model has been used in studying the influence of the surrounding medium on electrical conductivity of a Poly (dG)-Poly (dC) DNA molecule. This effect is studied in room temperature by taking into account twisting motion with two different low frequencies separately. Transfer matrix technique and scattering matrix method have been employed simultaneously. The current voltage characteristics and the differential conductance show that as the backbone disorder increases, the current decreases and the threshold voltage rises. However as the backbone disorder continues to increase, the reverse of the above phenomenon is observed.
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