Nonlinear theory of surface helical instability of a semiconducting plasma

Nonlinear equations characterizing the surface helical instability (SHI) of a semiconducting plasma in semispace are examined. Solutions for the first, zeroth, and second harmonics of the unstable wave are found. Dispersion relations and equations giving the amplitude and nonlinear frequency shift of the fundamental (first) harmonic are obtained.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 59–64, December, 1979.