Regensburg 2013 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 8: Posters: Proteins
BP 8.16: Poster
Montag, 11. März 2013, 17:30–19:30, Poster B2
Robust signatures in the current-voltage characteristics of DNA molecules oriented between two graphene nanoribbon electrodes — Carlos J. Paez1, Peter A. Schulz1,2, Neil Wilson3, and •Rudolf A. Römer3,4 — 1Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas, 777 Cidade Universitaria 13083-859 Campinas, SP Brazil — 2Faculdade de Ciencias Aplicadas, Universidade Estadual de Campinas, 13484-350 Limeira, SP Brazil — 3Department of Physics, University of Warwick, Coventry, CV4 7AL, UK — 4Centre for Scientific Computing, University of Warwick, Coventry, CV4 7AL, United Kingdom
In this work we numerically calculate the electric current through three kinds of DNA sequences (telomeric, λ-DNA, and p53-DNA) described by different heuristic models. A bias voltage is applied between two zig-zag edged graphene contacts attached to the DNA segments, while a gate terminal modulates the conductance of the molecule. We show that a telomeric DNA sequence, when treated as a quantum wire in the fully coherent low-temperature regime, works as an excellent semiconductor. Clear steps are apparent in the current-voltage curves of telomeric sequences and are present independent of lengths and sequence initialisation at the contacts. independent of length and sequencing initialisation at the contacts. The difference between telomeric DNA and other DNA, such as λ-DNA and DNA for the tumour suppressor p53, is particularly visible in the length dependence of the current.