Gutiérrez, Rafael and Mandal, Sudeep and Cuniberti, Gianaurelio (2005) Dissipative effects in the electronic transport through DNA molecular wires. Physical Review B 71, p. 235116.
Other URL: http://dx.doi.org/10.1103/PhysRevB.71.235116
We investigate the influence of a dissipative environment which effectively comprises the effects of counterions and hydration shells, on the transport properties of short DNA wires. Their electronic structure is captured by a tight-binding model which is embedded in a bath consisting of a collection of harmonic oscillators. Without coupling to the bath a temperature independent gap in the electronic spectrum opens in the electronic spectrum. Upon allowing for electron-bath interaction the gap becomes temperature dependent. It increases with temperature in the weak-coupling limit to the bath degrees of freedom. In the strong-coupling regime a bath-induced is formed. As a result, a crossover from semiconducting to metallic behavior in the low-voltage region of the - characteristics is observed with increasing temperature. The temperature dependence of the transmission near the Fermi energy, (), manifests an Arrhenius-like behavior in agreement with recent transport experiments. Moreover, () shows a weak exponential dependence on the wire length, typical of strong incoherent transport. Disorder e ects smear the electronic bands, but do not appreciably a ect the pseudo-gap formation.
|Institutions:||Physics > Institute of Theroretical Physics > Retired Professors > Group Gianaurelio Cuniberti|
|Projects:||EU Grant: DNA-based molecular nanowires, Graduiertenkolleg Nichtlinearität und Nichtgleichgewicht, Volkswagen Stiftung: Molecular Computing|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||20 Mar 2007|
|Last Modified:||20 Jul 2011 21:01|