Inelastic quantum transport in a ladder model: application to DNA conduction
Physical Review B 74, 235105 (2006).
R. Gutiérrez, S. Mohapatra, H. Cohen, D. Porath, and G. Cuniberti.
Journal DOI: https://doi.org/10.1103/PhysRevB.74.235105

We investigate quantum transport characteristics of a ladder model, which effectively mimics the topology of a double-stranded DNA molecule. We consider the interaction of tunneling charges with a selected internal vibrational degree of freedom and discuss its influence on the structure of the current-voltage characteristics. Further, molecule-electrode contact effects are shown to dramatically affect the orders of magnitude of the current. Recent electrical transport measurements on suspended DNA oligomers with a complex base-pair sequence, revealing strikingly high currents, are also presented and used as a reference point for the theoretical modeling. A semi-quantitative description of the measured I-Vcurves is achieved, suggesting that the coupling to vibrational excitations plays an important role in DNA conduction.


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Inelastic quantum transport in a ladder model: application to DNA conduction
Physical Review B 74, 235105 (2006).
R. Gutiérrez, S. Mohapatra, H. Cohen, D. Porath, and G. Cuniberti.
Journal DOI: https://doi.org/10.1103/PhysRevB.74.235105

We investigate quantum transport characteristics of a ladder model, which effectively mimics the topology of a double-stranded DNA molecule. We consider the interaction of tunneling charges with a selected internal vibrational degree of freedom and discuss its influence on the structure of the current-voltage characteristics. Further, molecule-electrode contact effects are shown to dramatically affect the orders of magnitude of the current. Recent electrical transport measurements on suspended DNA oligomers with a complex base-pair sequence, revealing strikingly high currents, are also presented and used as a reference point for the theoretical modeling. A semi-quantitative description of the measured I-Vcurves is achieved, suggesting that the coupling to vibrational excitations plays an important role in DNA conduction.


Cover
©https://doi.org/10.1103/PhysRevB.74.235105
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Involved Scientists