Inelastic quantum transport in a ladder model: Implications for DNA conduction and comparison to experiments on suspended DNA oligomers

Article

关键词: CHARGE-TRANSPORT;    ELECTRICAL-TRANSPORT;    ELECTRONIC STATES;    LONG-RANGE;    MOLECULES;    SINGLE;    POLY(DA)-POLY(DT);    POLY(DG)-POLY(DC);    LOCALIZATION;    WIRE;   

DOI  :  10.1103/PhysRevB.74.235105

来源: SCIE

【 摘 要 】

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 semiquantitative description of the measured I-V curves is achieved, suggesting that the coupling to vibrational excitations plays an important role in DNA conduction.

【 授权许可】

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