High T_c superconductivity due to coexisting wide and narrow bands: A fluctuation exchange study on the Hubbard ladder as a test case

Details High T_c superconductivity due to coexisting wide and narrow bands: A fluctuation exchange study on the Hubbard ladder as a test case High T_c superconductivity due to coexisting wide and narrow bands: A fluctuation exchange study on the Hubbard ladder as a test case

2005-03-18

arxiv.org/abs/cond-mat/0503466v1

Physics

Condensed Matter

Strongly Correlated Electrons

RevTeX, 5 pages

Scientific paper

10.1103/PhysRevB.72.212509

We propose that when the Fermi level lies within a wide band and also lies close to but not within a coexisting narrow band, high $T_c$ superconductivity may take place due to the large number of interband pair scattering channels and the small renormalization of the quasiparticles. We show using fluctuation exchange method that this mechanism works for the Hubbard model on a ladder lattice with diagonal hoppings. From this viewpoint, we give a possible explanation for the low $T_c$ for the actual hole doped ladder compound, and further predict a higher $T_c$ for the case of electron doping.

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