Abstract
We study the delocalization properties of the resonant extended states in the random dimer model (RDM) with various perturbations added. The divergent localization length ξ is found to display a power-law decay ξ ∝ W α as a function of the disorder W in the dimer or the background energies, with an exponent α around 2 depending on the location of the resonant state. For randomness in the dimer structure the exponent becomes α p = 1 and for the case of an applied electric field it reaches higher values α e > 2. These effects on the resonant states are discussed in connection with the electronic transport properties of realistic disordered systems.
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