Zeitschrift für Physik B Condensed Matter

ISSN: 0722-3277 (printed version)
ISSN: 1431-584X (electronic version)

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Abstract Volume 103 Issue 2 (1997) pp 177-180

Electron transport in dirty multi-channel systems

E. Arrigoni, B. Brendel, W. Hanke

Institut für Theoretische Physik, Universität Würzburg, D-97074 Würzburg, Germany

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 electron-electron interaction. Like in the purely 1-D case, the conductance vanishes at low temperature when the Luttinger-liquid exponent K_<rho>,+ (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 K_<rho>,+produced by the difference in Fermi velocities of the bonding and antibonding bands.

PACS: 71.10.Pm; 72.10.Fk; 71.10.Hf

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