Abstract
Doped semiconductors, being a physical realization of an ensemble of one- electron (hydrogenic) atoms distributed randomly in space, are in a sense the simplest disordered system. Our current understanding of their magnetic properties is reviewed, for densities on both sides of a critical density nc at which the system undergoes a transition (at zero temperature) from an insulating phase (n < nc) to a metallic phase (n > nc). It is argued that the insulating phase is well modeled in terms of a disordered Heisenberg anti- ferromagnet, and quantitative agreement with experiment can be obtained. In contrast, the metallic phase just beyond nc, is not as well understood, and a number of possible candidate models are described. Finally, the issue of the effect of magnetic properties on the metal-insulator transition is addressed.
Original language | English (US) |
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Pages (from-to) | 7-16 |
Number of pages | 10 |
Journal | Physica Scripta |
Volume | 1986 |
Issue number | T14 |
DOIs | |
State | Published - 1986 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Mathematical Physics
- Condensed Matter Physics