ANISOTROPY EFFECTS IN THE EXCITONIC INSULATOR.
CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF PHYSICS
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A new insulating phase in semiconductors and semimetals has been discussed recently in the literature. The analysis of this excitonic phase is extended to the more general case of an anisotropic band structure of the underlying two band model. The thermodynamic properties of the excitonic phase are worked out. Whereas the anisotropy does not lead to qualitatively new features in the case of a positive band gap semiconductor region, important changes occur in the case of a negative band gap semimetallic region. The latter situation is discussed in detail. Finally the phase diagram of the excitonic phase is calculated for a particular anisotropic band model. Author
- Solid State Physics