Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 26: Transport - Poster Session
TT 26.37: Poster
Mittwoch, 29. März 2006, 14:30–18:30, P1
Signatures of vibron-assisted transport in DNA molecular wires — •Rafael Gutierrez1, Sudeep Mandal1, Soumya Mohapatra1, Danny Porath2, and Gianaurelio Cuniberti1 — 1Molecular Computing Group, University of Regensburg, D-93040 Regensburg, Germany — 2Physical Chemistry Department, The Hebrew University, 91904, Jerusalem, Israel
We investigate the coupling of tunneling charges to intrinsic or extrinsic vibrational degrees of freedom in model Hamiltonians which effectively mimic the low-energy electronic structure of DNA molecular wires. We especially discuss two cases: (i) interaction with an external dissipative bosonic bath, and (ii) coupling to intrinsic vibrational modes. The first case can be relevant to experiments in aqueous solution, see e.g. B. Xu et al., Nano Lett. 4, 1105 (2004). The second case takes into account the influence of intrinsic dynamical fluctuations of the double helix on a propagating charge. Our results suggest that in the recent experiments of H. Cohen et al., Proc. Natl. Acad. Sci. (USA) 102, 11589 (2005) on short suspended DNA wires, vibrational modes might give a non-negligible contribution in determining the measured high currents.