  We show that long-range ferromagnetic interactions in quantum spin chains can
induce spatial quasi-localization of topological magnetic defects, i.e.,
domain-walls, even in the absence of quenched disorder. By means of
matrix-product-states numerical techniques, we study the non-equilibrium
evolution of initial states with one or more domain-walls under the effect of a
transverse field in variable-range quantum Ising chains. Upon increasing the
range of these interactions, we demonstrate the occurrence of a sharp
transition characterized by the suppression of spatial diffusion of the
magnetic defects during the accessible time scale: the excess energy density
remains localized around the initial domain-wall positions, hindering
thermalization. This quasi-localization is accurately reproduced by an
effective semiclassical model, which elucidates the crucial role that
long-range interactions play in this phenomenon. These predictions can be
tested in current experiments with trapped ions.
