Composite-carrier pairing in doped Chern ferromagnets

Determine whether, in a doped Chern ferromagnet, Cooper pairs can form from composite spinful carriers generated by binding doped charge to spin-flip (magnon) excitations rather than from fully spin-polarized carriers.

Background

The paper investigates superconductivity emerging upon hole doping a Chern ferromagnet, motivated by recent observations in moiré materials such as twisted bilayer MoTe2. In this context, the authors consider whether charge carriers may bind to spin-flip excitations to form composite spinful objects that subsequently pair, instead of relying on fully spin-polarized carriers.

This question is framed against prior work on spin-polaron formation and skyrmionic excitations in ferromagnets and Chern bands, and is particularly relevant for Ising (spin-U(1)) Chern ferromagnets where opposite spin bands carry opposite Chern numbers.

References

This raises two important open questions. In a doped Chern ferromagnet, can the relevant Cooper pairs be formed not from fully spin-polarized carriers, but from composite spinful carriers generated by binding charge to spin-flip excitations?

— Chiral skyrmionic superconductivity from doping a Chern Ferromagnet  (2604.02298 - Gonçalves et al., 2 Apr 2026) in Introduction (paragraph beginning with "This raises two important open questions.")