SciPost logo

A simple mechanism for unconventional superconductivity in a repulsive fermion model

Kevin Slagle, Yong Baek Kim

SciPost Phys. 6, 016 (2019) · published 1 February 2019

Abstract

Motivated by a scarcity of simple and analytically tractable models of superconductivity from strong repulsive interactions, we introduce a simple tight-binding lattice model of fermions with repulsive interactions that exhibits unconventional superconductivity (beyond BCS theory). The model resembles an idealized conductor-dielectric-conductor trilayer. The Cooper pair consists of electrons on opposite sides of the dielectric, which mediates the attraction. In the strong coupling limit, we use degenerate perturbation theory to show that the model reduces to a superconducting hard-core Bose-Hubbard model. Above the superconducting critical temperature, an analog of pseudo-gap physics results where the fermions remain Cooper paired with a large single-particle energy gap.

Cited by 8

Crossref Cited-by

Ontology / Topics

See full Ontology or Topics database.

Cooper pairs Lattice fermions Superconductivity/superconductors

Authors / Affiliations: mappings to Contributors and Organizations

See all Organizations.
Funder for the research work leading to this publication