COHERENT PROPERTIES OF ELECTRON-EMISSION FROM A SINGLE HETEROBARRIER

The energy spectrum of emitted electrons from a single barrier is anal yze taking into account quantized levels of an accumulation layer. A s elf-consistent model is developed which solves Poisson's equation, the continuity equation, Schrodinger's equation, and the heat equation. T he relationship between the population of the quantized levels, the en ergy relaxation time, and the tunneling probability is formulated. The energy spectrum consists of components from three- and two-dimensiona l electrons. A new emitter structure is proposed which effectively rem oves the three-dimensional current component providing a highly effect ive method of producing electrons with a very narrow energy spread in the direction of propagation.