Superconductivity in the Two-Band Hubbard Model in Infinite Dimensions

Details Superconductivity in the Two-Band Hubbard Model in Infinite Dimensions Superconductivity in the Two-Band Hubbard Model in Infinite Dimensions

1993-04-09

arxiv.org/abs/cond-mat/9304018v1

Physics

Condensed Matter

12 pages (14 figures not included, available upon request), Latex, LPTENS Preprint 93/10

Scientific paper

10.1007/BF01308748

We study a two-band Hubbard model in the limit of infinite dimensions, using a combination of analytical methods and Monte-Carlo techniques. The normal state is found to display various metal to insulators transitions as a function of doping and interaction strength. We derive self-consistent equations for the local Green's functions in the presence of superconducting long-range order, and extend previous algorithms to this case. We present direct numerical evidence that in a specific range of parameter space, the normal state is unstable against a superconducting state characterized by a strongly frequency dependent order-parameter.

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