Theoretical analysis demonstrates unrenormalized Landauer conductance in Luttinger liquids with noninteracting leads, indicating why long quantum wires preserve standard quantization.
We show that the dc conductance of a quantum wire containing a Luttinger liquid and attached to noninteracting leads is given by e²/h per spin orientation, regardless of the interactions in the wire. This explains the recent observations of the absence of conductance renormalization in long high-mobility GaAs wires by Tarucha, Honda, and Saku [Solid State Commun. 94, 413 (1995)].
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Maslov et al. (1995) studied this question.