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We investigate the influence of the chemical potential mismatch $\Delta$(different electron densities) on Coulomb drag between two parallel ballisticquantum wires. For pair collisions, the drag resistivity $\rho_{\rm D}(\Delta)$shows a peculiar anomaly at $\Delta=0$ with $\rho_{\rm D}$ being finite at$\Delta=0$ and vanishing at any nonzero $\Delta$. The "bodyless" resonance in$\rho_{\rm D}(\Delta)$ at zero $\Delta$ is only broadened by processes ofmulti-particle scattering. We analyze Coulomb drag for finite $\Delta$ in thepresence of both two- and three-particle scattering within the kinetic equationframework, focusing on a Fokker-Planck picture of the interaction-induceddiffusion in momentum space of the double-wire system. We describe thedependence of $\rho_{\rm D}$ on $\Delta$ for both weak and strong intrawireequilibration due to three-particle scattering.

Ultranarrow resonance in Coulomb drag between quantum wires at coinciding densities