$\eta$-pairing as a mechanism of superconductivity in models of strongly correlated electrons

Abstract

We consider extended versions of the Hubbard model which contain additional interactions between nearest neighbours. In this letter we show that a large class of these models has a superconducting ground state in arbitrary dimensions. In some special cases we are able to find the complete phase diagram. The superconducting phase exist even for moderate repulsive values of the Hubbard interaction $U$.

9 pages, RevTex, ITP-SB-94-18, 1 PS figure appended

References in corpus (2)

• New Exactly Solvable Model of Strongly Correlated Electrons Motivated by High T_c Superconductivity
• Excitation spectrum and critical exponents of a one-dimensional integrable model of fermions with correlated hopping

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