Influence of solitons on the conductance properties of double-stranded deoxyribonucleic acid |
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Authors: | S A Ketabi T Ghane and N Shahtahmasebi |
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Institution: | (1) Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, CA 94720, USA;(2) Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, USA; |
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Abstract: | A numerical study is presented to investigate the role of solitons in the electronic states of double-stranded DNA (dsDNA)
molecule in the metal/DNA/metal system. Based on tight-binding Hamiltonian model and within the framework of a generalized
Green’s function technique, we consider a ladder model for poly(dG)-poly(dC) DNA molecule containing M cells with four sites
(two base pair sites and two backbone sites) in each cell. In the presence of a sublattice of solitons, our results show that
the homogeneous soliton distributions induce the electronic states in the band gap of DNA molecule. In addition, the room
temperature current-voltage characteristic of the system shows a linear and ohmic-like behaviour. |
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