The electrical properties of poly(dA)-poly(dT) DNA molecule: electrical current influenced by magnetic field and electric field

Abstract

This theoretical study aims to determine the electrical properties of poly(dA)-poly(dT) DNA molecule under influence of electric and magnetic fields as external disturbances. The electrical properties of the DNA is investigated using a tight-binding model in the second quantization form. Then, the Landauer-Buttiker formalism is used in calculating electric current from the transmission probability which is calculate using the green function approach. While the external interference is considered by modelling the magnetic dependent hopping phase and the electric field dependent hopping amplitude in the tight binding Hamiltonian. The calculation results shows that the electric field applied along the DNA decreases sharply the peak of the transmission band. This means that the electric field significantly weakening the quality of transmission in poly(dA)-poly(dT) DNA molecule. On the other hand, the increase in magnetic field results in the increment of maximum current and the decrement of threshold voltage.