Tunneling between two Luttinger liquids with long-range interaction

The nonlinear charge transfer through a tunnel junction between two Luttinger systems is studied for repulsive, finite-range interaction between electrons on the same side, ${\mathrm{V}}_{11}$, and on different sides, ${\mathrm{V}}_{12}$, of a junction. Features of the Coulomb blockade effect are observed if ${\mathrm{V}}_{12}$=0. We predict an interaction-induced enhancement of the current if ${\mathrm{V}}_{12}$>0. When ${\mathrm{V}}_{12}$=${\mathrm{V}}_{11}$, the current is suppressed at small bias, but the ``charging energy,'' obtained from the asymptotic behavior at high-bias voltage, vanishes.