Polaron Hopping in Nano-scale Poly(dA)-Poly(dT) DNA

Abstract

We investigate the current-voltage relationship and the temperature-dependent conductance of nano-scale samples of poly(dA)-poly(dT) DNA molecules. A polaron hopping model has been used to calculate the I-V characteristic of nano-scale samples of DNA. This model agrees with the data for current versus voltage at temperatures greater than 100 K. The quantities G(0), i(0), and T(1d) are determined empirically, and the conductivity is estimated for samples of poly(dA)-poly(dT).

Figure 1

Plot of conductance as a function of inverse temperature for poly(dA)–poly(dT) DNA. Data were numerically calculated by Yoo et al. for zero voltage from their I–V curves

Figure 2

Plot of electric current as a function of voltage for two samples of poly(dA)–poly(dT) DNA at 143, 161, and 223 K. Fits to the data are represented by solid curves