Scanning tunneling spectroscopy of single DNA molecules.
We briefly present the results of recent experiments of transverse scanning tunneling spectroscopy of homogeneous poly(dG)-poly(dC) DNA molecules and discuss them in the light of theoretical investigation. A semiempirical theoretical model is adopted to describe the transverse tunneling current across a DNA molecule placed between a metallic gold substrate and a metallic STM tip. We show that the main trends in the positions and relative magnitudes of the conductance peaks can be explained by a minimal model of a double tunnel junction with the molecule-electrode couplings and the applied voltage explicitly taken into account.
Ryndyk
Dmitry A
DA
Institute for Theoretical Physics, University of Regensburg, Regensburg 93040, Germany.
Shapir
Errez
E
Porath
Danny
D
Calzolari
Arrigo
A
Di Felice
Rosa
R
Cuniberti
Gianaurelio
G