Superconductivity in an exactly solvable Hubbard model with bond-charge interaction

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 $U=\infty$ 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.

Revtex, 14 pages, 1 figure (uuencoded compressed tar-file)

References in corpus (4)

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