S-matrix network models for coherent waves in random media: construction and renormalization

Physics – Condensed Matter – Mesoscale and Nanoscale Physics

Scientific paper

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10 pages, LaTeX, 8 eps figures included, proceedings PILS98, to be published in Annalen der Physik

Scientific paper

10.1002/(SICI)1521-3889(199811)7

Networks of random quantum scatterers (S-matrices) form paradigmatic models for the propagation of coherent waves in random S-matrix network models cover universal localization-delocalization properties and have some advantages over more traditional Hamiltonian models. In particular, a straightforward implementation of real space renormalization techniques is possible. Starting from a finite elementary cell of the S-matrix network, hierarchical network models can be constructed by recursion. The localization-delocalization properties are contained in the flow of the forward scattering strength ('conductance') under increasing system size. With the aid of 'small scale' numerics qualitative aspects of the localization-delocalization properties of S-matrix network models can be worked out.

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