Extended states in disordered systems: role of off-diagonal correlations
arXiv:cond-mat/0403197 · doi:10.1103/PhysRevB.69.153203
Abstract
We study one-dimensional systems with random diagonal disorder but off-diagonal short-range correlations imposed by structural constraints. We find that these correlations generate effective conduction channels for finite systems. At a certain golden correlation condition for the hopping amplitudes, we find an extended state for an infinite system. Our model has important implications to charge transport in DNA molecules, and a possible set of experiments in semiconductor superlattices is proposed to verify our most interesting theoretical predictions.
4pp, 3 figs, to appear in PRB