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The Fermion-ladder models: extensions of the Hubbard model with -pairing

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, , Citation Heng Fan 1999 J. Phys. A: Math. Gen. 32 L509 DOI 10.1088/0305-4470/32/48/101

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1 Department of Physics, Graduate School of Science, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan

Dates

  1. Received 11 October 1999

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0305-4470/32/48/L509

Abstract

We propose two-leg fermion-ladder models for the SU(2|2) and SU(4) cases. The former is exactly the extended Hubbard model proposed by Essler, Korepin and Schoutens. The latter is a new model also with -pairing symmetry which is important for superconductivity. This new extension of the Hubbard model can be solved exactly.

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