Electron Energy Loss Spectroscopy of Gallium Arsenide and Other Materials.
Abstract
The one-electron band theory of the electronic properties of solids the comparison between and experiment had been inhibited by the lack of experimental information relating specific features of the electronic band structure to their locations in the Brillouin zone. This information is necessary to understand such phenomena as hot-electron behavior and charge density waves. Present models for these phenomena postulate specific energy-band features at specific Brillouin zone locations; such locations have not been verified directly. Three years ago we began building an apparatus to use the technique of high-energy electron energy loss spectroscopy (HELS) to provide the information on Brillouin zone location by allowing the observation of non-vertical transitions, that is, transitions between occupied and empty electron states with k-vector differing by as much as or more than a reciprocal lattice vector. The HELS data will allow us to map out the structure of both the conduction and valence bands through the Brillouin zone. Other techniques, such as photoemission, in general provide information only on the occupied (valence) bands. The HELS and angle-resolved photoemission (ARPES) techniques are complementary in that both measurements are needed to map out a complete band structure. HELS data on the dispersion of K-dependence of transitions between critical points (band maxima and minima) will provide information on the band curvatures or effective masses.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1982
- Accession Number
- ADA127787
Entities
People
- Margaret H. Weiler
Organizations
- Massachusetts Institute of Technology