Localization of a polymer in random media: Relation to the localization of a quantum particle

Details Localization of a polymer in random media: Relation to the localization of a quantum particle Localization of a polymer in random media: Relation to the localization of a quantum particle

2000-11-03

arxiv.org/abs/cond-mat/0011064v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

RevTex, 44 pages, 13 figures

Scientific paper

10.1103/PhysRevE.63.051803

In this paper we consider in detail the connection between the problem of a polymer in a random medium and that of a quantum particle in a random potential. We are interested in a system of finite volume where the polymer is known to be {\it localized} inside a low minimum of the potential. We show how the end-to-end distance of a polymer which is free to move can be obtained from the density of states of the quantum particle using extreme value statistics. We give a physical interpretation to the recently discovered one-step replica-symmetry-breaking solution for the polymer (Phys. Rev. E{\bf 61}, 1729 (2000)) in terms of the statistics of localized tail states. Numerical solutions of the variational equations for chains of different length are performed and compared with quenched averages computed directly by using the eigenfunctions and eigenenergies of the Schr\"odinger equation for a particle in a one-dimensional random potential. The quantities investigated are the radius of gyration of a free gaussian chain, its mean square distance from the origin and the end-to-end distance of a tethered chain. The probability distribution for the position of the chain is also investigated. The glassiness of the system is explained and is estimated from the variance of the measured quantities.

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