We present a novel pairing mechanism for electrons, mediated by magnons. These paired bound states are termed ``magnetic doublons''. Applying numerically exact techniques (full diagonalization and the density-matrix renormalization group, DMRG) to the Kondo lattice model at strong exchange coupling J for different fillings and magnetic configurations, we demonstrate that magnetic doublon excitations exist as composite objects with very weak dispersion. They are highly stable, support a novel ``inverse'' colossal magnetoresistance and potentially other effects.
@article{arxiv.1909.11896,
title = {Magnetic Doublon Bound States in the Kondo Lattice Model},
author = {Roman Rausch and Michael Potthoff and Norio Kawakami},
journal= {arXiv preprint arXiv:1909.11896},
year = {2024}
}