A phenomenological model of donor clusters is found to describe the optical and magnetic properties well at donor densities below the Mott density. The effects of clustering on the single-particle density of states is discussed. Microscopic calculations lead to the conclusion that in multi-valley semiconductors large clusters are sufficiently electronegative to attract an electron from isolated donors or donor pairs and as a result, there is no Mott-Hubbard gap due to correlation. The insulating property is ascribed to' Anderson localization at the Fermi level.
|Original language||English (US)|
|Number of pages||14|
|Journal||Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties|
|State||Published - Jan 1 1980|
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Physics and Astronomy(all)