Intertwined Superconductivity and Magnetism from Repulsive Interactions in Kondo Bilayers

While superconductors are conventionally established by attractive interactions, higher-temperature mechanisms for emergent electronic pairing from strong repulsive electron-electron interactions remain under considerable scrutiny. Here, we establish a strong-coupling mechanism for intertwined super...

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Bibliographic Details
Published in:arXiv.org 2024-08
Main Authors: Weber, Clara S, Kiese, Dominik, Kennes, Dante M, Claassen, Martin
Format: Article
Language:English
Subjects:
Antiferromagnetism
Bilayers
Bosons
Couplings
Electrons
Ferromagnetism
Heterostructures
Interlayers
Magnetism
Monte Carlo simulation
Multilayers
Numerical analysis
Phase diagrams
Phase separation
Superconductivity
Superconductors
Two dimensional analysis
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Summary:While superconductors are conventionally established by attractive interactions, higher-temperature mechanisms for emergent electronic pairing from strong repulsive electron-electron interactions remain under considerable scrutiny. Here, we establish a strong-coupling mechanism for intertwined superconductivity and magnetic order from purely repulsive interactions in a Kondo-like bilayer system, composed of a two-dimensional Mott insulator coupled to a layer of weakly-interacting itinerant electrons. Combining large scale DMRG and Monte Carlo simulations, we find that superconductivity persists and coexists with magnetism over a wide range of interlayer couplings. We classify the resulting rich phase diagram and find 2-rung antiferromagnetic and 4-rung antiferromagnetic order in one-dimensional systems along with a phase separation regime, while finding that superconductivity coexists with either antiferromagnetic or ferromagnetic order in two dimensions. Remarkably, the model permits a rigorous strong-coupling analysis via localized spins coupled to charge-2e bosons through Kugel-Khomskii interactions, capturing the pairing mechanism in the presence of magnetism due to emergent attractive interactions. Our numerical analysis reveals that pairing remains robust well beyond the strong-coupling regime, establishing a new mechanism for superconductivity in coupled weakly- and strongly-interacting electron systems, relevant for infinite-layer nickelates and superconductivity in moire multilayer heterostructures.
ISSN:2331-8422