Dissipative Effects in the Electronic Transport through DNA Molecular Wires

Details Dissipative Effects in the Electronic Transport through DNA Molecular Wires Dissipative Effects in the Electronic Transport through DNA Molecular Wires

2005-07-25

arxiv.org/abs/cond-mat/0507565v1

Physical Review B 71, 235116 (2005)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

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 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 {\it pseudo-gap} is formed. As a result, a crossover from tunneling to activated behavior in the low-voltage region of the $I$-$V$ characteristics is observed with increasing temperature. The temperature dependence of the transmission near the Fermi energy, $t(E_{\rm F})$, manifests an Arrhenius-like behavior in agreement with recent transport experiments. Moreover, $t(E_{\rm F})$ shows a weak exponential dependence on the wire length, typical of strong incoherent transport. Disorder effects smear the electronic bands, but do not appreciably affect the pseudo-gap formation.

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