Homeier, Lukas and Lange, Hannah and Demler, Eugene and Bohrdt, Annabelle and Grusdt, Fabian (2025) Feshbach hypothesis of high-Tc superconductivity in cuprates. NATURE COMMUNICATIONS, 16 (1): 314. ISSN 2041-1723
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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 dx2-y2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${d}_{{x}<^>{2}-{y}<^>{2}}$$\end{document} 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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | HIGH-TEMPERATURE SUPERCONDUCTIVITY; SINGLE-PARTICLE EXCITATIONS; BOSE-CONDENSATION; SPECTRAL-FUNCTION; QUASI-PARTICLES; PHASE COHERENCE; PSEUDOGAP STATE; SPIN POLARONS; MIXED-VALENCE; BOUND-STATE; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 28 Jul 2026 07:13 |
| Last Modified: | 28 Jul 2026 07:54 |
| URI: | https://pred.uni-regensburg.de/id/eprint/67354 |
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