Transverse focusing of electrons in the presence of nonstationary emitter currents

Transverse focusing of electrons in the presence of nonstationary emitter currents is investigated theoretically under the assumption that the size of the contact b exceeds the effective skin-layer depth δ. It is shown that if the voltage on the emitter changes with frequency ω exceeding the inverse time of flight of the electron through the region at the emitter ω0−1≈b/υF then there is no focusing effect (υF is the Fermi velocity). In the frequency interval Ωω0<ω<ω0 (Ω is the Larmor frequency of the electron), the height of the peak of transverse focusing of electrons depends considerably on the magnitude of ω.

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