Berlin 2005 – wissenschaftliches Programm
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AKB: Biologische Physik
AKB 200: Poster Session II
AKB 200.35: Poster
Dienstag, 8. März 2005, 17:00–19:00, Poster TU C
Optical conductivity of wet DNA — •Arnd Hübsch1, Robert G. Endres2, Daniel L. Cox1, and Rajiv R. P. Singh1 — 1Department of Physics, University of California, Davis, CA 95616 — 2NEC Laboratories, Princeton, NJ 08540
DNA has attracted much attention in view of its possible application to nano-devices. Despite extensive efforts, however, the experimental results of the conductivity of DNA are still rather controversial. Motivated by recent optical experiments [1] we have studied the optical conductivity of DNA in its natural environment containing water molecules and counter ions. Our DFT calculations using the SIESTA code suggest a thermal activated doping of the DNA which leads to an electronic low-frequency absorption. The main contributions to the doping result from the DNA ends, breaks, or nicks.
[1] E. Helgren, A. Omerzu, G. Gruner, D. Mihailovic, R. Podgornik, and H. Grimm, cond-mat/0111299.