Delocalization in Continuous Disordered Systems

Details Delocalization in Continuous Disordered Systems Delocalization in Continuous Disordered Systems

1997-08-30

arxiv.org/abs/cond-mat/9709003v1

Phys. Rev. B, 55 (1997) 10625-10630

Physics

Condensed Matter

Disordered Systems and Neural Networks

8 pages

Scientific paper

10.1103/PhysRevB.55.10625

Continuous One-dimensional models supporting extended states are studied. These delocalized statesoccur at well defined values of the energy and are consequences of simple statistical correlation rules. We explicitly study alloys of delta-barrier potentials as well as alloys and liquids of quantum well as.The divergence of the localization length is studied and a critical exponent 2/3 is found for the delta-barrier case, whereas for the quantum wells we find an exponent of 2 or 2/3 depending on the well's parameters. These results support the idea that correlations between random scattering sequences break Anderson localization. We further calculate the conductance of disordered superlattices. At the peak transmission the relative fluctuations of the transmission coefficient are vanishing.

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