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| VOLUME 114 (2021) | ISSUE 1 | PAGE 41 |
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Two-impurity scattering in quasi-one-dimensional systems1)
A. S. Ioselevich+* 2), N. S. Peshcherenko* 2)
+Condensed-matter physics laboratory, National Research University Higher School of Economics, 101000 Moscow, Russia L. D. Landau Institute for Theoretical Physics, 119334 Moscow, Russia
Abstract
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 (  ) 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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