Accession Number : ADA194101

Title :   Hot Electron Emission in Semiconductors.

Descriptive Note : Technical rept. no. 7 (Final) 26 Nov 84-29 Feb 88,

Corporate Author : INNSBRUCK UNIV (AUSTRIA) INST OF EXPERIMENTAL PHYSICS

Personal Author(s) : Gornik, Erich ; Unterrainer, Karl ; Helm, Manfred

PDF Url : ADA194101

Report Date : 25 Mar 1988

Pagination or Media Count : 117

Abstract : The spectrum of the simulated far infrared emission from p-Germanium in crossed electric and magnetic fields is studied by means of a tunable narrow-band GaAs-detector. A multimode spectrum is observed from polished high parallel samples. The mode spectrum is quantitatively explained in terms of internal waveguide-like modes. With the help of an external resonator the number of modes was drastically reduced. The external resonator has a confocal configuration. For the first time a single mode operation is demonstrated. The problem of the electron distribution in crossed electric and quantizing magnetic fields is treated for free electrons in a parabolic band. The master equation for the diagonal elements of the density matrix is solved including the kz-dependence of the electron distribution. It is shown that population inversion between Landau levels can be achieved if scattering by optical phonons and a quasi-elastic scattering process are taken into account.

Descriptors :   *ELECTRON EMISSION, *FREE ELECTRONS, *MAGNETIC FIELDS, *PHONONS, DISTRIBUTION, ELECTRIC FIELDS, ELECTRONS, EQUATIONS, EXTERNAL, INVERSION, MULTIMODE, OPERATION, OPTICS, PARALLEL ORIENTATION, POPULATION, RESONATORS, SAMPLING, SCATTERING, SPECTRA, AUSTRIA

Subject Categories : Solid State Physics
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE