Twisting motion dependent charge transport properties of poly(dG)-poly(dC) DNA molecular wire

Efta Yudiarsah, D. K. Suhendro, Rosari Saleh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

Abstract

The effect of twisting motion of bases on charge transport properties of Poly(dG)-Poly(dC) DNA molecule have been studied. The effect is studied by taking into account twisting angle dependent on-site energy and hopping constant in the tight binding Hamiltonian of double-strand DNA model. The average kinetic energy of twisting motions is assumed to be proportional to system temperature. Transfer matrix method has been used in calculating the localization length of the molecule. The results show that increase in temperature shortens the localization length. The transmission probability of charge on the molecule was calculated using transfer and scattering matrix methods simultaneously on the DNA model sandwiched in between two metallic electrodes. The contacts between molecule and both electrodes were chosen such that the presence of metallic electrodes does not change the main features of transport properties of the molecule much. The temperature tends to widen the area with zero transmission around the Fermi energy. The I-V characteristic of the molecule connected to electrodes has been calculated from transmission probability within Landauer-Buttiker Formalism by assuming the voltage drops symmetrically at the contacts. The results show that temperature lowers the magnitude of the I-V characteristic and the differential conductance. In addition to that, the I-V characteristic and the differential conductance also decrease in magnitude with lowering the twisting frequency.

Original languageEnglish
Title of host publicationAIP Conference Proceedings
EditorsMitra Djamal, Nandang Mufti, Markus Diantoro
PublisherAmerican Institute of Physics Inc.
Pages35-38
Number of pages4
ISBN (Electronic)9780735412545
DOIs
Publication statusPublished - 1 Jan 2014
Event3rd International Conference on Theoretical and Applied Physics 2013, ICTAP 2013 - Malang, East Java, Indonesia
Duration: 10 Oct 201311 Oct 2013

Publication series

NameAIP Conference Proceedings
Volume1617
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference3rd International Conference on Theoretical and Applied Physics 2013, ICTAP 2013
CountryIndonesia
CityMalang, East Java
Period10/10/1311/10/13

Keywords

  • DNA molecule
  • I-V characteristic
  • temperature
  • transmission
  • transport
  • twisting motion

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    Yudiarsah, E., Suhendro, D. K., & Saleh, R. (2014). Twisting motion dependent charge transport properties of poly(dG)-poly(dC) DNA molecular wire. In M. Djamal, N. Mufti, & M. Diantoro (Eds.), AIP Conference Proceedings (pp. 35-38). (AIP Conference Proceedings; Vol. 1617). American Institute of Physics Inc.. https://doi.org/10.1063/1.4897098