Superlight pairs in face-centred-cubic extended Hubbard models with strong Coulomb repulsion
Superconductivity
2022-01-20 v2 Strongly Correlated Electrons
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).
Keywords
Cite
@article{arxiv.2109.03031,
title = {Superlight pairs in face-centred-cubic extended Hubbard models with strong Coulomb repulsion},
author = {G D Adebanjo and P E Kornilovitch and J P Hague},
journal= {arXiv preprint arXiv:2109.03031},
year = {2022}
}