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DomínguezAdame Acosta, Francisco and Díez, E. and Sánchez, A. (1995) 3Dimensional effects on extended states in disordered models of polymers. Physical Review B, 51 (13). pp. 18151824. ISSN 01631829

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Official URL: http://dx.doi.org/10.1103/PhysRevB.51.8115
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http://journals.aps.org  Publisher 
Abstract
We study electronic transport properties of disordered polymers in a quasionedimensional model with fully threedimensional interaction potentials. We consider such quasionedimensional lattices in the presence of both uncorrelated and shortrange correlated impurities. In our procedure, the actual physical potential acting upon the electrons is replaced by a set of nonlocal separable potentials, leading to a Schrodinger equation that is exactly solvable in the momentum representation. By choosing an appropriate potential with the same spectral structure as the physical one, we obtain a discrete set of algebraic equations that can be mapped onto a tightbindinglike equation. We then show that the re8ection coefficient of a pair of impurities placed. at neighboring sites (dimer defect) vanishes for a particular resonant energy. When there is a finite number of such defects randomly distributed over the whole lattice, we find that the transmission coefficient is almost unity for states close to the resonant energy, and that those states present a very large localization length. Multifractal analysis techniques applied to very long systems demonstrate that these states are truly extended in the thermodynamic limit. These results are obtained with parameters taken from actual physical systems such as polyacetylene, and thus reinforce the possibility of verifying experimentally theoretical predictions about the absence of localization in quasionedimensional disordered systems.
Item Type:  Article 

Additional Information:  © 1995 The American Physical Society. 
Uncontrolled Keywords:  RandomDimer Model, Conducting Polymers, Correlated Disorder, BinaryAlloys, Random Chains, Localization, Propagation, Absence, Polyacetylene, Polyaniline 
Subjects:  Sciences > Physics > Materials 
ID Code:  27766 
Deposited On:  16 Dec 2014 08:48 
Last Modified:  13 Jan 2015 08:31 
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