Low-temperature nonequilibrium transport in a Luttinger liquid

The temperature-dependent nonlinear conductance for transport of a Luttinger liquid through a barrier is calculated in the nonperturbative regime for g = 1/2 - epsilon, where g is the dimensionless interaction constant. To describe the low-energy behavior, we perform a leading-logarithmic summation of all diagrams contributing to the conductance which is valid for \epsilon\ much less than 1. With increasing external voltage, the asymptotic low-temperature behavior displays a turnover from the T-2/g-2 to a universal T-2 law.