Wave-Packet Dynamics Simulation on Electronic Transport in Carbon Nanotubes with Randomly Distributed Impurities

Abstract

We investigate coherent electronic transport in semiconducting single-walled carbon nanotubes with randomly distributed impurities utilizing the wave-packet dynamics method combined with the mode-space decomposition method, focusing particularly on the case of small hole doping. From the behavior of the time-dependent diffusion coefficient and the diffusion length, we verify that the system exhibits Anderson's localization due to quasi-one-dimensionality of nanotubes. Moreover, we reveal the dependence of impurity-potential strength on the localization length, and consequently we demonstrate that the localization can occur even at room temperature, which is consistent with the recent experimental results.