Modeling of the temperature and magnetic field dependence on the density of states of G4-DNA molecules

In this article, we investigate the charge-transport properties of G4-DNA molecules that are 32 base pairs long using the tight-binding Hamiltonian and Green function in numerical calculations. The transport properties are studied by calculating the density of states (DOS) of the G4-DNA model under the influence of various external magnetic field strengths and temperatures. We found that a shift in phase coherence lowers the DOS as the magnetic field increases. At zero temperature, the DOS spectrum is split into two bands of electron energies with a specific gap of zero values between them. Increasing the temperature decreases the DOS at all electron energies and narrows the energy gap in the DOS spectra when the frequency of the molecule's twisting motion is 0.77 meV.