Quantum transport through a DNA wire in a dissipative environment

TL;DR

This paper investigates how a strong dissipative environment influences electronic transport in DNA wires, revealing bath-induced states, temperature-dependent conductance, and a new environmental transport mechanism relevant to molecular conduction experiments.

Contribution

It introduces the concept of bath-induced electronic states within the DNA bandgap and explores their impact on conductance behavior in a dissipative environment.

Findings

Formation of bath-induced electronic states within the bandgap.

Temperature-dependent crossover from tunneling to thermal activation.

Conductance at the Fermi level shows weak exponential or algebraic length dependence.

Abstract

Electronic transport through DNA wires in the presence of a strong dissipative environment is investigated. We show that new bath-induced electronic states are formed within the bandgap. These states show up in the linear conductance spectrum as a temperature dependent background and lead to a crossover from tunneling to thermal activated behavior with increasing temperature. Depending on the strength of the electron-bath coupling, the conductance at the Fermi level can show a weak exponential or even an algebraic length dependence. Our results suggest a new environmental-induced transport mechanism. This might be relevant for the understanding of molecular conduction experiments in liquid solution, like those recently performed on poly(GC) oligomers in a water buffer (B. Xu et al., Nano Lett 4, 1105 (2004)).