We study the conductance fluctuations of a dirty quantum wire in which both mesoscopic and ballistic transport features play a role. The existence of a ballistic transport channel destroys the universal conductance fluctuations, so that the "mixed" transport regime is marked by nonuniversal fluctuations which we compute both analytically, using a diagrammatic technique, and with a numerical evaluation of the Landauer formula. The crossover behavior of the fluctuation amplitude from the usual quasi-1D situation to that of the mixed regime is clearly revealed, and the role of various length scales are identified.
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Zhu et al. (1996) studied this question.