Ioffe-Regel criterion of Anderson localization in the model of resonant point scatterers

Abstract

We establish a phase diagram of a model in which scalar waves are scattered by resonant point scatterers pinned at random positions in the free three-dimensional (3D) space. A transition to Anderson localization takes place in a narrow frequency band near the resonance frequency provided that the number density of scatterers $\rho$ exceeds a critical value ${\rho }_c\simeq 0.08k_0^3$, where $k_0$ is the wave number in the free space. The localization condition $\rho >{\rho }_c$ can be rewritten as $k_0{\ell }_0<1$, where ${\ell }_0$ is the on-resonance mean free path in the independent-scattering approximation. At mobility edges, the decay of the average amplitude of a monochromatic plane wave is not purely exponential and the growth of its phase is nonlinear with the propagation distance. This makes it impossible to define the mean free path $\ell$ and the effective wave number $k$ in a usual way. If the latter are defined as an effective decay length of the intensity and an effective growth rate of the phase of the average wave field, the Ioffe-Regel parameter $(k\ell {)}_c$ at the mobility edges can be calculated and takes values from 0.3 to 1.2 depending on $\rho$. Thus, the Ioffe-Regel criterion of localization $k\ell <(k\ell {)}_c=\mathrm{const}\sim 1$ is valid only qualitatively and cannot be used as a quantitative condition of Anderson localization in 3D.

Revised and extended version. 9 pages, 6 figures

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