A simple mechanism for unconventional superconductivity in a repulsive fermion model

Slagle, Kevin; Kim, Yong Baek

doi:10.21468/SciPostPhys.6.2.016

SciPost Physics

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

doi: 10.21468/SciPostPhys.6.2.016
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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.

TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.6.2.016
TI  - A simple mechanism for unconventional superconductivity in a repulsive fermion model
PY  - 2019/02/01
UR  - https://scipost.org/SciPostPhys.6.2.016
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 6
IS  - 2
SP  - 016
A1  - Slagle, Kevin
AU  - Kim, Yong Baek
AB  - 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.
ER  -

@Article{10.21468/SciPostPhys.6.2.016,
	title={{A simple mechanism for unconventional superconductivity in a repulsive fermion model}},
	author={Kevin Slagle and Yong Baek Kim},
	journal={SciPost Phys.},
	volume={6},
	pages={016},
	year={2019},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.6.2.016},
	url={https://scipost.org/10.21468/SciPostPhys.6.2.016},
}

Cited by 8

Ontology / Topics

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Cooper pairs Lattice fermions Superconductivity/superconductors

Authors / Affiliations: mappings to Contributors and Organizations

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¹ ² Kevin Slagle,
² ³ Yong Baek Kim

Funder for the research work leading to this publication

Conseil de Recherches en Sciences Naturelles et en Génie / Natural Sciences and Engineering Research Council [NSERC / CRSNG]