Exact solution of the infinite-U Hubbard problem and other models in one dimension

Details Exact solution of the infinite-U Hubbard problem and other models in one dimension Exact solution of the infinite-U Hubbard problem and other models in one dimension

2008-12-16

arxiv.org/abs/0812.2977v1

Phys. Rev. B 79, 155121 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

revtex4, 6 pages, no figures; submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.79.155121

An interacting spin-fermion model is exactly solved on an open chain. In a certain representation, it is the nearest-neighbor Hubbard model in the limit of infinite $U$ (local interaction). Exact solution of its complete energy eigen-spectrum is accomplished by introducing a unitary transformation which maps the original problem to a tight-binding model of the fermions only. Physically, the exact solution implies the absence of Nagaoka ferromagnetism in the ground state for arbitrary electron densities. The present method solves a class of very general models exactly. Few more problems are discussed as an application of this unitary transform method.

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