title: Temperature and magnetic field effects on electron transport through DNA molecules in a two-dimensional four-channel system.
abstract: We utilize a two-dimensional four-channel DNA model, with a tight-binding (TB) Hamiltonian, and investigate the temperature and the magnetic field dependence of the transport behavior of a short DNA molecule. Random variation of the hopping integrals due to the thermal structural disorder, which partially destroy phase coherence of electrons and reduce quantum interference, leads to a reduction of the localization length and causes suppressed overall transmission. We also incorporate a variation of magnetic field flux density into the hopping integrals as a phase factor and observe Aharonov-Bohm (AB) oscillations in the transmission. It is shown that for non-zero magnetic flux, the transmission zero leaves the real-energy axis and moves up into the complex-energy plane. We also point out that the hydrogen bonds between the base pair with flux variations play a role to determine the periodicity of AB oscillations in the transmission.
authors.affiliation: Department of Physics and Research Institute for Basic Sciences, Kyung Hee University, Seoul 130-701, Korea.
authors.forename: Yong S
authors.initials: YS
authors.lastname: Joe
authors.forename: Sun H
authors.initials: SH
authors.lastname: Lee
authors.forename: Eric R
authors.initials: ER
authors.lastname: Hedin
authors.forename: Young D
authors.initials: YD
authors.lastname: Kim
mesh_terms: D004247:DNA / Q000737:chemistry*; D008280:Magnetics; D008962:Models, Theoretical; D013696:Temperature
chemical_list: D004247:DNA