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VOLUME 114 (2021) | ISSUE 1 | PAGE 41
Two-impurity scattering in quasi-one-dimensional systems1)
In a quasi-one-dimensional system (a tube) with low concentration of defects n the resistivity ρ has peaks (van-Hove singularities) as a function of Fermi-energy. We show that due to non-Born scattering effects a deep narrow gap should appear just in the center of each peak. The resistivity at the bottom of a gap (\rho_{\min}\propto n^2) is dominated by scattering at rare "twin" pairs of close defects, while scattering at solitary defects is suppressed. The predicted effect is characteristic for multi-channel systems, it can not be observed in strictly one-dimensional one.

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