Superlight pairs in face-centred-cubic extended Hubbard models with strong Coulomb repulsion

Adebanjo, G. D.; Kornilovitch, P. E. and Hague, J. P. (2022). Superlight pairs in face-centred-cubic extended Hubbard models with strong Coulomb repulsion. Journal of Physics: Condensed Matter, 34(13) p. 135601.

DOI: https://doi.org/10.1088/1361-648x/ac484e

Abstract

The majority of fulleride superconductors with unusually high transition-temperature to kinetic-energy ratios have a face-centred-cubic (FCC) structure. We demonstrate that, within extended Hubbard models with strong Coulomb repulsion, paired fermions in FCC lattices have qualitatively different properties than pairs in other three-dimensional cubic lattices. Our results show that strongly bound, light, and small pairs can be generated in FCC lattices across a wide range of the parameter space. We estimate that such pairs can Bose condense at high temperatures even if the lattice constant is large (as in the fullerides).

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