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A simple mechanism for unconventional superconductivity in a repulsive fermion model

Slagle, Kevin and Kim, Yong Baek (2019) A simple mechanism for unconventional superconductivity in a repulsive fermion model. SciPost Physics, 6 (2). Art. No. 016. ISSN 2542-4653. doi:10.21468/SciPostPhys.6.2.016.

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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.

Item Type:Article
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URLURL TypeDescription Paper
Slagle, Kevin0000-0002-8036-3447
Alternate Title:A Simple Mechanism for High-Temperature Superconductivity in a Repulsive Fermion Model
Additional Information:© 2018 K. Slagle and Y. B. Kim. This work is licensed under the Creative Commons Attribution 4.0 International License. Published by the SciPost Foundation. Received 20-09-2018; Accepted 28-01-2019; Published 01-02-2019. We thank Garnet Chan, Alon Ron, Arun Paramekanti, Patrick Lee, Alex Thomson, Jong Yeon Lee, Nai-Chang Yeh, Yuval Oreg, Arbel Haim, Leonid Isaev, and Olexei Motrunich for helpful discussions. This work was supported by the NSERC of Canada and the Center for Quantum Materials at the University of Toronto. KS also acknowledges support from the Walter Burke Institute for Theoretical Physics at Caltech.
Group:Walter Burke Institute for Theoretical Physics
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Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
University of TorontoUNSPECIFIED
Walter Burke Institute for Theoretical Physics, CaltechUNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20190521-133203496
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95646
Deposited By: Tony Diaz
Deposited On:21 May 2019 20:41
Last Modified:16 Nov 2021 17:14

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