Coulomb Drag between One-Dimensional Conductors

We have analyzed Coulomb drag between currents of interacting electrons in two parallel one-dimensional conductors of finite length L attached to external reservoirs. For strong coupling, the relative fluctuations of electron density in the conductors acquire energy gap M. At energies larger than ${Γ}{{0ex}{0ex}}={{0ex}{0ex}}const×{}{v}_{{-}}exp({-}LM/{v}_{{-}})/L+{{Γ}}₊$, where ${{Γ}}₊$ is the impurity scattering rate, and, for $L>{v}_{{-}}/M$, where ${v}_{{-}}$ is the fluctuation velocity, the gap leads to an ``ideal'' drag with almost equal currents in the conductors. At low energies the drag is suppressed by coherent instanton tunneling, and the zero-temperature transconductance vanishes, indicating the Fermi-liquid behavior.