Abstract
We investigate the electronic transmission properties of polymers which consist of a dimerized backbone chain with randomly distributed side chains of length 2m. The system is connected to perfect left-hand and right-hand metallic leads, and the transmission spectrum is computed. We find 2m-2 high-transmission and 2 low-transmission peaks which reflect resonant extended states in the random system and the gap edges of the dimerized backbone chain, respectively. The temperature dependence of the conductivity is shown to be very sensitive to the position of the Fermi level. The tunnelling current at zero temperature in the presence of a bias voltage gives a region of negative differential conductivity, which is due to a competition between the opening of a transmission window by the applied bias and the suppression of the transmission peaks by the electric field.
Published Version
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