  We present a scheme comprised of a one-dimensional system with repulsive
interactions, in which the formation of bound pairs can take place in an easily
tunable fashion.By capacitively coupling a primary electronic quantum wire of
interest to a secondary strongly-correlated fermionic system, the intrinsic
electron-electron repulsion may be overcome, promoting the formation of bound
electron pairs in the primary wire. The intrinsic repulsive interactions tend
to favor the formation of charge density waves of these pairs, yet we find that
superconducting correlations are dominant in a limited parameter regime. Our
analysis show that the paired phase is stabilized in an intermediate region of
phase space, encompassed by two additional phases: a decoupled phase, where the
primary wire remains gapless, and a trion phase, where a primary electron pair
binds a charge carrier from the secondary system. Tuning the strength of the
primary-secondary interaction, as well as the chemical potential of the
secondary system, one can control the different phase transitions. Our approach
takes into account the interactions among the secondary degrees of freedom, and
strongly relies on their highly correlated nature. Extension of our proposal to
two dimensions is discussed, and the conditions for a long-range
superconducting order from repulsion only are found. Our physical description,
given by a simple model with a minimal amount of ingredients, may help to shed
some light on pairing mechanism in various low-dimensional strongly correlated
materials.
