Local density of states and Friedel oscillations around a nonmagnetic impurity in unconventional density waves

András Ványolos, B. Dóra, A. Virosztek

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3 Citations (Scopus)

Abstract

We present a mean-field theoretical study on the effect of a single nonmagnetic impurity in quasi-one-dimensional unconventional density wave. The scattering potential is treated within the self-consistent T -matrix approximation. The local density of states around the impurity exhibits resonant states in the vicinity of the Fermi level, much the same way as in d density waves or unconventional superconductors. The assumption for different forward and backward scattering, characteristic to quasi-one-dimensional systems in general, leads to a resonance state that is double peaked in the pseudogap. The Friedel oscillations around the impurity are also explored, both within and beyond the density wave coherence length ξ0. Beyond ξ0, we find power-law behavior as opposed to the exponential decay of conventional density wave.

Original languageEnglish
Article number193101
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number19
DOIs
Publication statusPublished - May 10 2007

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Impurities
impurities
oscillations
Scattering
Fermi level
Superconducting materials
forward scattering
scattering
decay
approximation

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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AB - We present a mean-field theoretical study on the effect of a single nonmagnetic impurity in quasi-one-dimensional unconventional density wave. The scattering potential is treated within the self-consistent T -matrix approximation. The local density of states around the impurity exhibits resonant states in the vicinity of the Fermi level, much the same way as in d density waves or unconventional superconductors. The assumption for different forward and backward scattering, characteristic to quasi-one-dimensional systems in general, leads to a resonance state that is double peaked in the pseudogap. The Friedel oscillations around the impurity are also explored, both within and beyond the density wave coherence length ξ0. Beyond ξ0, we find power-law behavior as opposed to the exponential decay of conventional density wave.

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