Ferromagnetic superconductivity with excitonic Cooper pairs: Application to Γ-valley twisted semiconductors.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 42160443.
- Also identified by DOI 10.1126/sciadv.aeb4888 and PMC identifier 13189127.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
We present a theory of ferromagnetic superconductivity that emerges upon doping a correlated ferromagnetic insulator through the condensation of excitonic Cooper pairs, which are charge-2<i>e</i> bosonic quasiparticles made of Cooper pairs strongly hybridized with excitons. Using a strong-coupling expansion supported by exact diagonalization, we analyze a model of spin-polarized electrons and show that excitonic Cooper pairs form from electron-hole fluctuations upon doping a strongly correlated insulator. We characterize their binding energy, effective mass, and the resulting superconducting transition temperature. We propose possible realization of spin-polarized superconductivity in twisted semiconductors with honeycomb moiré superlattice.