Existence of Two Types of Insulating States in the Hubbard Model
- 19 August 1974
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 33 (8) , 486-489
- https://doi.org/10.1103/physrevlett.33.486
Abstract
If a band is narrow and is not nearly empty nor nearly full, the Hubbard lattice is shown to be an insulator. The lattice containing about one electron per atom will be a Hubbard-type insulator with a wide energy gap but if the number of electrons decreases or increases beyond a certain range, the gap is suddenly reduced, yielding a small-gap insulator of a completely new type.Keywords
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