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A theory describing the evolution of domain instability in a two-parameter space (voltage and emission coefficient) was verified experimentally for p-Ge doped with Sb and compensated with Au (residual impurity concentration N A − N D = (10 −14 −10 −15 ) cm −3 at 77 K) in strong electric fields under high levels of optical excitation. According to the theory, one-, two-and multi-subdomain states and order-disorder-order transitions via intermittency are observed in the system with increasing voltage. Three operation modes of the system are found, depending on the region of the parametric space: ohmic, quenched (pulsing) or transit-time.

Dynamic chaos evolution scenarios of the development of a Kadomtsev-Nedospasov instability in the electron-hole plasma in germanium at 77 and 300 K have been studied experimentally in external electric and magnetic fields at high control parameters. The development of a spatio-temporal chaotic state in the system has been analysed using probe measurements along a sample. It is shown that several attractors, with their own dimensions and power characteristics, may exist simultaneously in the same sample. Scenarios have been found leading to chaos through period doubling, quasi-periodicity and intermittency, depending on the parametric space; transitions of the order-chaos-order type have also been observed.

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