Abstract
We study the effect of a weak nonlinearity in media on the linear regime of current flow in two-dimensional periodic structures with two equal component concentrations. We find that the asymptotic behavior of the electric field and current as functions of the distance between the angles in heterogeneous media is determined by the parameter h=σ 2/σ 1 (here σ 1 and σ 2 are the linear conductivities of the cells) and the external magnetic field B. This dependence leads to divergence of the higher-order moments of field and current at certain critical values h c and B c and to divergence of the response functions related to the higher-order moments. For square cells the effective nonlinear conductivity diverges at h⩽h c, with \(h_c = (\sqrt 2 - 1)^2 \). For structures of general shape we find the dependence of h c on the angles and the external magnetic field. We show that for a given structure the linear regime of current flow in the system can be reversibly transformed into a nonlinear one by varying the magnetic field strength. The critical field B c is approximately determined from the condition ω c τ∼1, where ω c and τ −1 are, respectively, the cyclotron frequency and the collision rate. Finally, we discuss the feasibility of detecting these effects experimentally.
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Zh. Éksp. Teor. Fiz. 112, 643–660 (August 1997)
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Satanin, A.M., Khor’kov, S.V. & Skuzovatkin, V.V. Breakdown of the linear current regime in periodic structures. J. Exp. Theor. Phys. 85, 351–359 (1997). https://doi.org/10.1134/1.558291
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DOI: https://doi.org/10.1134/1.558291