Volume 45, Number 2, January 1999
|Page(s)||181 - 187|
|Section||Condensed matter: structure, thermal and mechanical properties|
|Published online||01 September 2002|
Hot electron transport in Ballistic Electron Emission Spectroscopy: Band structure effects and -space currents
Instituto de Ciencia de Materiales (CSIC ),
Cantoblanco - E-28049 Madrid, Spain
2 Lehrstuhl für Festkörperphysik, University of Erlangen-Nürnberg, Germany
3 Departamento de Física Teórica de la Materia Condensada Universidad Autonoma de Madrid - E-28049 Madrid, Spain
4 Institut für Theoretische Physik, Karl-Franzens-Universität Graz A-8010 Graz, Austria
Accepted: 8 November 1998
Using a Green's function approach, we investigate band structure effects in the BEEM current distribution in -space. In the elastic limit, this formalism provides a "para meter free” solution of the BEEM problem. At low temperatures, and for thin metallic layers, the elastic approximation is enough to explain the experimental I(V) curves at low voltages. At higher voltages inelastic effects are approximately taken into account by introducing an effective RPA-electron lifetime, much in similarity with LEED theory. For thick films, however, additional damping mechanisms are required to obtain agreement with experiment.
PACS: 61.16.Ch – Scanning probe microscopy: scanning tunneling, atomic force, scanning optical, magnetic force, etc / 72.10.Bg – General formulation of transport theory / 73.20.At – Surface states, band structure, electron density of states
© EDP Sciences, 1999
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