I developed a theory of combined exciton-cyclotron resonance ~ExCR! in a low-density two-dimensional electron gas in high magnetic fields. In the presence of excess electrons an incident photon creates an exciton and simultaneously excites one electron to higher-lying Landau levels. I derived exact ExCR selection rules that followed from the existing dynamical symmetries, magnetic translations ...

The intensive research on ferroelectric electron-emission mechanisms in the last decade has resulted in a wide understanding of the physics and characteristics of this plasma-assisted electron source. Nevertheless, practical devices employing this cathode were hardly introduced. In this experimental study, a high-repetition-rate microwave oscillator based on a ferroelectric electron gun has bee...

The introduction of a plasma and a strong guide magnetic field in a free electron laser (FEL) slows down the phase velocity of radiation, significantly reducing the requirements on beam energy for generating frequencies below the electron-cyclotron frequency (oi, < oj,). Around plasma resonance (cu, ~ wp), the FEL mode couples to two-stream instability (TSI), attaining a large growth rate, comp...

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