Abstract
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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Georges, A., Kotliar, G. & Krauth, W. Superconductivity in the two-band Hubbard model in infinite dimensions. Z. Physik B - Condensed Matter 92, 313–321 (1993). https://doi.org/10.1007/BF01308748
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DOI: https://doi.org/10.1007/BF01308748