  Some well-established examples of itinerant-electron ferromagnetism in one
dimension occur in a Mott-insulating phase. We examine the consequences of
doping a ferromagnetic insulator and cou- pling magnons to gapless charge
fluctuations. Using a bosonization scheme for strongly interacting electrons,
we derive an effective field theory for the magnon-holon interaction. When the
magnon momentum matches the Fermi momentum of the holons, the backscattering of
the magnon at low energies gives rise to a Kondo effect of a pseudospin defined
from the chirality degree of freedom (right- or left-moving particles). The
crossover between weak-coupling and strong-coupling fixed points of the
effective mobile-impurity model is then investigated using a numerical
renormalization group approach.
