Extended states in disordered systems: role of off-diagonal correlations

Details Extended states in disordered systems: role of off-diagonal correlations Extended states in disordered systems: role of off-diagonal correlations

2004-03-08

arxiv.org/abs/cond-mat/0403197v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

4pp, 3 figs, to appear in PRB

Scientific paper

10.1103/PhysRevB.69.153203

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.

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