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
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.