Magnetic susceptibility and other ground state properties of the two-band Anderson-type model in one dimension
✍ Scribed by H. Kaga; T. Fujiwara
- Publisher
- Elsevier Science
- Year
- 1986
- Weight
- 792 KB
- Volume
- 142
- Category
- Article
- ISSN
- 0378-4363
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✦ Synopsis
The T = 0 magnetic susceptibility and other ground state properties of the one-dimensional two-band Anderson-type model are studied in both the symmetric and the asymmetric cases. The magnetic susceptibility of the symmetric model exhibits the coherent Kondo lattice ground state in the strong-coupling regime, whereas it shows an excitonic insulatormetal transition with increase in Coulomb repulsion. The general asymmetric cases are investigated by numerically solving the integral equation. For the asymmetric limit U-> 2V 2 and e F ~ e a (e F the Fermi level, e a the localized level), when a non-integral localized-electron valence is stabilized implying a valence fluctuation, e F lies in the gap, whereas when it is an integral valence, e F lies in the upper band. The former state is semiconducting and the latter is metallic.