Superconductivity from Flat Dispersion Designed in Doped Mott Insulators
Strongly Correlated Electrons
2009-10-31 v1 Superconductivity
Abstract
Routes to enhance superconducting instability are explored for doped Mott insulators. With the help of insights for criticalities of metal-insulator transitions, geometrical design of lattice structure is proposed to control the instability. A guideline is to explicitly make flat band dispersions near the Fermi level without suppressing two-particle channels. In a one-dimensional model, numerical studies show that our prescription with finite-ranged hoppings realizes large enhancement of spin-gap and pairing dominant regions. We also propose several multi-band systems, where the pairing is driven by intersite Coulomb repulsion.
Cite
@article{arxiv.cond-mat/9911185,
title = {Superconductivity from Flat Dispersion Designed in Doped Mott Insulators},
author = {Masatoshi Imada and Masanori Kohno},
journal= {arXiv preprint arXiv:cond-mat/9911185},
year = {2009}
}
Comments
4 pages, to be published in Phys. Rev. Lett