Wspólnotowy Serwis Informacyjny Badan i Rozwoju - CORDIS

Empirical modelling of current-voltage characteristics of DNA-based wires between electrodes

As a preliminary experimental-theory collaboration before the beginning of the project, a simple fishbone model was initially formulated and applied to investigate the role of nucleobase-backbone coupling in the electrical behaviour: the evidence of an excitation gap in measured transport curves was explained [1]. Later, the model was refined to take into account the environmental effects, in particular the presence of a solution represented as a thermal bath. The results show important modifications of the quantum conductance at the Fermi level due to electron-phonon coupling, and allow for an interpretation of recent experiments [2,3]. We remark that this theoretical activity, devoted to environmental effects, was undertaken as a follow-up to reviewers' comments at the evaluations, which encouraged a tighter experiment-theory connection and concerted research efforts.

[1] G. Cuniberti, L. Craco, D. Porath, C. Dekker, "Backbone-induced semi-conducting behavior in short DNA wires", Phys. Rev. B 65, R241314 (2002).
[2] R. Gutierrez-Laliga, S. Mandal, and G. Cuniberti, "Quantum Transport through a DNA Wire in a Dissipative Environment", Nano Letters 5, 1093 (2005).
[3] R. Gutierrez-Laliga, S. Mandal, and G. Cuniberti, "Dissipative effects in the electronic transport through DNA molecular wires", Phys. Rev. B 71, 235116 (2005).

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