Abstract
The dynamic behavior associated with current instabilities in semiconductors is discussed. The important role of electrodynamic interactions is pointed out. In the mean-field approximation, these interactions can be represented by a linear feedback mechanism. Results obtained for two specific cases, the Gunn instability and the Erlbach instability, are reviewed. In these cases, there occurs a soft longitudinal dielectric relaxation mode and an undamping of transverse modes.
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