Chaotic Behaviors of the Current Filaments in a Model of Firing Wave Instability

Chaotic behaviors of the current filaments in semiconductor have been investigated numerically, based on a model of firing wave instability. Phase portrait and surface of section of the chaotic motion reveal a basin of strange attractor which has the structure of a folded torus. The bifurcation of torus is discussed from the analysis of Fourier power spectra.