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Transport properties of poly(GACT)-poly(CTGA) deoxyribonucleic acid: A ladder model approach

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Abstract

In this paper, based on the tight-binding Hamiltonian model and within the framework of a generalized Green’s function technique, the electronic conduction through the poly(GACT)-poly(CTGA) DNA molecule in SWNT/DNA/SWNT structure has been numerically investigated. In a ladder model, we consider DNA as a planar molecule containing M cells and four further sites (two base pair sites and two backbone sites) in each cell, sandwiched between two semi-infinite single-walled carbon nanotubes (SWNT) as the electrodes. Having relied on Landauer formalism, we focussed on studying the current-voltage characteristics of DNA, the effect of the coupling strength of SWNT/DNA interface and the role of tube radius of nanotube contacts on the electronic transmission through the foregoing structure. Finally, a characteristic time was calculated for the electron transmission, which measures the delay caused by the tunnelling through the SWNT/DNA interface. The results clearly show that the calculated characteristic time and also the conductance of the system are sensitive to the coupling strength between DNA molecule and nanotube contacts.

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Authors and Affiliations

  1. School of Physics, Damghan University of Basic Sciences, Damghan, Iran

    S. A. Ketabi & A. A. Fouladi

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  1. S. A. Ketabi
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  2. A. A. Fouladi
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Correspondence to S. A. Ketabi.

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Ketabi, S.A., Fouladi, A.A. Transport properties of poly(GACT)-poly(CTGA) deoxyribonucleic acid: A ladder model approach. Pramana - J Phys 72, 1023–1036 (2009). https://doi.org/10.1007/s12043-009-0082-z

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  • DOI: https://doi.org/10.1007/s12043-009-0082-z

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