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Superconductivity of magnonic Cooper pairs in the infinite-U triangular lattice

Hantian Zhu1, Yixin Zhang1, Shang-Shun Zhang1, Yang Zhang1,2,*, and Cristian D. Batista1,3,†

  • *Contact author: yangzhang@utk.edu
  • †Contact author: cbatist2@utk.edu
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Phys. Rev. B 114, 165107 – Published 4 September, 2026

DOI: https://doi.org/10.1103/b97g-cjf8

Abstract

We demonstrate that the infinite-U triangular-lattice Hubbard model supports a superconducting state built from tightly bound Cooper pairs composed of two holes and one magnon (2h1m). Building on the seminal prediction of repulsively bound 2h1m states, we show that next-nearest-neighbor hopping t2 coherently mixes symmetry-related configurations, stabilizing an s-wave bound state with substantial binding energy and a light effective mass. Large-scale density matrix renormalization group calculations at finite doping reveal, over a finite magnetic-field window, a magnetization plateau with one magnon per pair of doped holes and quasi-long-range superconducting order characterized by algebraically decaying 2h1m correlations. Our results establish a kinetically driven superconducting phase of composite magnonic Cooper pairs and provide directly measurable signatures for moiré Hubbard materials and ultracold-atom simulators.

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Outline

Information

Phys. Rev. B 114, 165107– Published 4 September, 2026
  • Received 24 January 2026
  • Revised 5 August 2026
  • Accepted 18 August 2026
Article part of CHORUS
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