Plasmon Mediated Electron Beam Transport in Quantum Plasma

Abstract: Starting from the quantum hydrodynamic model and transforming to the coupled driven pseudoforce system the plasmonic excitations of electron beam with arbitrary degree of degeneracy are studied. Using the conventional normal-mode analysis a dual-length-scale wavefunction theory for a monochromatic electron beam is developed. The beam plasmon excitations are shown to have both wave and particle character, de Broglie wavenumbers of which depend on various parameters such as average beam speed, the chemical potential, the charge screening and the background electrostatic energy. The deterministic single electron dynamics in the beam is investigated using the dual-wavelength electrostatic potential energy. It is shown that electrons can be either trapped or traveling along the beam direction depending on the ambient plasma parameter values. The problem of monochromatic beam transport through binary as well as ternary metallic configurations are investigated and some technological applications of these system are pointed out. The theory is extended to multistream phenomenon and electron beam transport through multimedia junction. We believe that current study can have major impact on understanding of the quantum beam-plasma interactions and instabilities and can further elucidate the mechanisms involving in the collective quantum wave-particle phenomena.