摘要: Two-band models for superconductivity are reviewed. In particular, a recent two-band Hubbard model strongly correlated electron systems is analysed. We consider various cases (signs and magnitudes) the intraband interband interactions, exhausting possible situations in system, to look into off-diagonal order (superconductivity) as well diagonal (magnetic CDW) orders. Among remarkable results are: (i) there exists mechanism when all intra- interactions repulsive, (ii) superconductivity band B can be enhanced by A even intra-A-band repulsive, and (iii) the interband-pairing due attraction only presence of repulsion.
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