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Electronic Conduction in Short DNA Wires

Weihua Mu ,Zhanchun Tu ,Zhong-can Ou-Yang ²
Institute of Theoretical Physics, CAS, Beijing 100080, China Institute of Theoretical Physics, CAS,Beijng 100080, China ²Institute of Theoretical Physics, CAS, Beijing 100080,China
A strict method is used to calculate the current-voltage characteristics of a double-stranded DNA. A more reliable model considering the electrostatic potential drop along an individual DNA molecular wire between the contacts is considered and the corresponding Green\'s Function is obtained analytically using generating function method, which avoids difficult numerical evaluations. The obtained results indicate that the electrostatic drop along the wire always makes the current-voltage curve steeper beyond certain threshold than without considering it, which accords well with recent experiments. The present method can also be used to calculate the current-voltage characteristics for other molecular wires of arbitrary length.

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