Formation and propagation of localized states in extended systems

Abstract

The turn-off behavior of two types of high-voltage diodes is investigated by means of numerical simulations. Basic self-organized structures appearing as transient patterns during the turn-off period are quasi-stationary or traveling current-density filaments and periodic current-density distributions. Additionally, we find evolution of more complex patterns that can be considered to be a superposition of basic structures. Examples of such complex structures are presented and mechanisms leading to their evolution are discussed.