Electronic conduction of poly(dG)-poly(dC) DNA in SWNT/DNA/SWNT structure
محل انتشار: مجله پژوهش فیزیک ایران، دوره: 8، شماره: 4
سال انتشار: 1387
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 330
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شناسه ملی سند علمی:
JR_PSI-8-4_008
تاریخ نمایه سازی: 30 دی 1397
چکیده مقاله:
In this work, using a tight-binding Hamiltonian model, a generalized Green s function method and Löwdin s partitioning techniques, some of the significant properties of the conductance of poly(dG)-poly(dC) DNA molecule in SWNT/DNA/SWNT structure are numerically investigated. In Fishbone model, we consider DNA as a planar molecule which contains M cells and 3 further sites (one base pair site and two backbone sites) in each cell sandwiched between two semi-infinite single-walled carbon nanotubes(SWNT) as the nano-electrodes. Relying on Landauer formalism as the basis for investigating the conductance properties of this system, we focus on the studying of the electron transmission and the current-voltage characteristics of DNA in the foregoing structure. In addition, in the presence of the electric potential between DNA molecule ends, our results suggest that the increasing of the value of applied bias give rise to the large enhancement in the conductance of the system. We also find that, as the tube radius increases, the conductance of the system considerably increases.
کلیدواژه ها:
نویسندگان
s a Ketabi
School of Physics, Damghan University of Basic Sciences, Damghan, Iran
a Ahmadi Fouladi
School of Physics, Damghan University of Basic Sciences, Damghan, Iran
n Shahtahmasebi
Department of Physics, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran