  We study the effect of inter-component interactions on the dynamical
properties of quantum walkers. We consider the simplest situation of two
indistinguishable non-interacting walkers on a tilted optical lattice
interacting with a walker from a different component. The mediated effect of
the third particle is then analyzed in the backdrop of various controlling
parameters. The interaction-induced two-particle correlations are shown to be
non-trivially affected by the particle statistics, choice of initial states,
and tilting configurations of the lattice. Our analysis thus offers an overall
picture and serves as a starting point of a study of interacting
multi-component quantum walkers.
