Thermodynamic Bethe-ansatz equations for the Hubbard chain with an attractive interaction

Kong Ju Bock Lee, P. Schlottmann

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

The thermodynamic Bethe-ansatz equations for the one-dimensional Hubbard model are derived for an attractive on-site interaction of the electrons, extending in this way Takahashis result for the repulsive Hubbard chain. The results are discussed in several special limits, e.g., interaction much larger than the hopping, U'0 case, and the high- and low-temperature limits. The dominating states at low temperatures consist of spin-paired electrons (resembling Cooper pairs) and bound states of such pairs. The excitation spectrum and its properties are discussed in the context of superconductivity and resonant valence bonds.

Original languageEnglish
Pages (from-to)11566-11571
Number of pages6
JournalPhysical Review B
Volume38
Issue number16
DOIs
StatePublished - 1988

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