Superconducting pairing from repulsive interactions of fermions in a flat-band system
Strongly Correlated Electrons
2022-10-12 v1 Quantum Gases
Superconductivity
Abstract
Fermion systems with flat bands can boost superconductivity by enhancing the density of states at the Fermi level. We use quasiexact numerical methods to show that repulsive interactions between spinless fermions in a one-dimensional (1D) flat-band system, the Creutz ladder, give a finite pairing energy that increases with repulsion, though charge quasi-order (QO) remains dominant. Adding an attractive component shifts the balance in favor of superconductivity and the interplay of two flat bands further yields a remarkable enhancement of superconductivity, well outside of known paradigms for 1D fermions.
Keywords
Cite
@article{arxiv.2111.03321,
title = {Superconducting pairing from repulsive interactions of fermions in a flat-band system},
author = {Iman Mahyaeh and Thomas Köhler and Annica M. Black-Schaffer and Adrian Kantian},
journal= {arXiv preprint arXiv:2111.03321},
year = {2022}
}