A Path Integral Approach to Effective Non-Linear Medium

Details A Path Integral Approach to Effective Non-Linear Medium A Path Integral Approach to Effective Non-Linear Medium

1998-06-25

arxiv.org/abs/cond-mat/9806302v1

European Physical Journal B (6) 537 (1998)

Physics

Condensed Matter

Disordered Systems and Neural Networks

7 pages

Scientific paper

10.1007/s100510050581

In this article, we propose a new method to compute the effective properties of non-linear disordered media. We use the fact that the effective constants can be defined through the minimum of an energy functional. We express this minimum in terms of a path integral allowing us to use many-body techniques. We obtain the perturbation expansion of the effective constants to second order in disorder, for any kind of non-linearity. We apply our method to both cases of strong and weak non-linearities. Our results are in agreement with previous ones, and could be easily extended to other types of non-linear problems in disordered systems.

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