Feshbach hypothesis of high-Tc superconductivity in cuprates

Lukas Homeier (), Hannah Lange, Eugene Demler, Annabelle Bohrdt and Fabian Grusdt ()
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Lukas Homeier: Ludwig-Maximilians-Universität München
Hannah Lange: Ludwig-Maximilians-Universität München
Eugene Demler: ETH Zurich
Annabelle Bohrdt: Munich Center for Quantum Science and Technology (MCQST)
Fabian Grusdt: Ludwig-Maximilians-Universität München

Nature Communications, 2025, vol. 16, issue 1, 1-14

Abstract: Abstract Resonant interactions associated with the emergence of a bound state constitute one of the cornerstones of modern many-body physics. Here we present a Feshbach perspective on the origin of strong pairing in Fermi-Hubbard type models. We perform a theoretical analysis of interactions between spin-polaron charge carriers in doped Mott insulators, modeled by a near-resonant two-channel scattering problem, and report evidence for Feshbach-type interactions in the $${d}_{{x}^{2}-{y}^{2}}$$ d x 2 − y 2 channel, consistent with the established phenomenology of cuprates. Existing experimental and numerical results on hole-doped cuprates lead us to conjecture the existence of a light, long-lived, low-energy excited state of two holes, which enables near-resonant interactions. To put our theory to a test we suggest to use coincidence angle-resolved photoemission spectroscopy (cARPES), pair-tunneling measurements or pump-probe experiments. The emergent Feshbach resonance among spin-polarons could also underlie superconductivity in other doped antiferromagnetic Mott insulators highlighting its potential as a unifying strong-coupling pairing mechanism rooted in quantum magnetism.

Date: 2025
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DOI: 10.1038/s41467-024-55549-4

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