Abstract
A recent paper of Capone et al. has studied an extended Hubbard model, in which local orbital degrees of freedom allow an even integer occupation at each site. A strong local repulsion U triggers a metal-insulator transition. Within a DMFT numerical analysis they show that when the ground state is a singlet a pocket of s-wave superconductivity appears in the vicinity of the Mott transition, with a strongly enhanced superconducting gap. A qualitative understanding of their result is proposed, and suggestions are made of possible systems in which this beautiful effect might be searched.
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Nozières, P. Can a Metal-Insulator Transition Induce s-Wave Superconductivity?. Journal of Statistical Physics 115, 19–30 (2004). https://doi.org/10.1023/B:JOSS.0000019826.53628.83
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DOI: https://doi.org/10.1023/B:JOSS.0000019826.53628.83