Superconductivity in an exactly solvable Hubbard model with bond-charge interaction
- 15 April 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 51 (16) , 10386-10391
- https://doi.org/10.1103/physrevb.51.10386
Abstract
The Hubbard model with an additional bond-charge interaction X is solved exactly in one dimension for the case t=X, where t is the hopping amplitude. In this case the number of doubly occupied sites is conserved. In the sector with no double occupations the model reduces to the U=∞ Hubbard model. In arbitrary dimensions the qualitative form of the phase diagram is obtained. It is shown that for moderate Hubbard interactions U the model has superconducting ground states.Keywords
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