Asymmetric Features in the Resistivity of Clean Quasi-One-Dimensional Systems: Fano Resonances or Non-Born Effects?
Abstract
We show that experimentally observed complex line shapes of smeared Van Hove singularities in the resistivity of a quasi-one-dimensional system may be due to non-Born effects in scattering. At low concentration of impurities n < n c ∝ |λ| with respect to scattering amplitude λ the non-Born effects are essential if the Fermi level is sufficiently close to singularity. The structure of the line shape depends on the sign of λ: for repulsion (λ>0) it is "plateau-minimum-maximum-plateau," while for attraction (λ<0) it is "plateau-maximum-minimum-maximum-plateau." In contrast with Fano-resonance scenario, complex structure of the line shape arises even in the absence of a resonant level.
- Publication:
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Soviet Journal of Experimental and Theoretical Physics Letters
- Pub Date:
- December 2018
- DOI:
- 10.1134/S0021364018240049
- Bibcode:
- 2018JETPL.108..810I