Abstract
We study the temperature dependence of the conductance and of the conductivity of a doped two-chain ladder system in the presence of a barrier or of a low impurity concentration, respectively, focusing on the effects of electronelectron interaction. Like in the purely 1-D case, the conductance vanishes at low temperature when the Luttinger-liquid exponent Kρ+ (for even-charge modes) is smaller than unity, despite the presence of dominant superconducting correlations. However, there is a region of repulsive interaction where perfect transmission across the barrier occurs. This is due to a renormalization of Kρ+ produced by the difference in Fermi velocities of the bonding and antibonding bands.
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