Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 14: Transport: Nanoelectronics III - Molecular Electronics

TT 14.4: Vortrag

Dienstag, 26. Februar 2008, 10:15–10:30, H 3010

Switching response of DNA conduction under stretching — •Bo Song¹, Marcus Elstner², and Gianaurelio Cuniberti¹ — ¹Institute for Materials Science, Dresden University of Technology, D-01062 Dresden, Germany — ²Institute for Physical and Theoretical Chemistry, Braunschweig University of Technology, D-38106 Braunschweig, Germany

By merging DFTB calculations and model-Hamiltonian approaches, we study the stretching-twisting process of poly(GC) DNA oligomers. A local maximum for the transfer integral t between two nearest-neighbor GC pairs is found in the stretching process, which arises from the competition between stretching and twisting. This results in a local maximum for the current in the case that the electrode-DNA coupling Γ is greater than t. Reducing Γ to the values smaller than t gives rise to plateaus in the current. The heights of such plateaus are almost equal to each other.