DNA molecules possess high density genetic information in living beings, as well as selfassembly
and self-recognition properties that make them excellent candidates for many scientific
areas, from medicine to nanotechnology. The process of electron transport through DNA is
important because DNA repair occurs spontaneously via the process that restores mismatches
and lesions, and furthermore, DNA-based molecular electronics in nano-bioelectronics can be
possible through the process. In this thesis, we study theoretically the transport properties
through a one-dimensional one-channel DNA model, a quasi-one-dimensional one-channel DNA
model, and a two-dimensional four-channel DNA model by using the Tight-Binding Hamiltonian
method. We show graphical outputs of the transmission, overall contour plots of transmission,
localization lengths, the Lyapunov exponent, and current-voltage characteristics as a function of
incoming electron energy and magnetic flux which are obtained using Mathematica run on the
CSH Beowulf Cluster. Our results show that the semiconductor behavior can be observed in the
I-V characteristics. The current through a quasi-one-dimensional one-channel DNA model starts
to flow after the breakdown voltage and remains constant after threshold voltage. The variations
of the temperature make the fluctuations of the system. As the temperature increases, the sharp
transmission resonances are smeared out and the localization lengths are also decreased. Due to a
magnetic field penetrating at the center of the two-dimensional DNA model, the Aharonov-
Bohm (AB) oscillations can be observed. / Sequence dependent electron transport through a one-dimensional, one-channel DNA model -- Backbone-induced effects on charge transport through a quasi one-dimensional DNA molecule -- Temperature and magnetic fields effects on the electron transport through two-dimensional and four-channel DNA model.
| Identifer | oai:union.ndltd.org:BSU/oai:cardinalscholar.bsu.edu:123456789/193308 |
| Date | 09 June 2011 |
| Creators | Lee, Sun-Hee |
| Contributors | Joe, Yong S. |
| Source Sets | Ball State University |
| Detected Language | English |
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