Quantum interference in nested d-wave superconductors: a real-space perspective
Abstract
We study the local density of states around potential scatterers in d-wave superconductors, and show that quantum interference between impurity states is not negligible for experimentally relevant impurity concentrations. The two impurity model is used as a paradigm to understand these effects analytically and in interpreting numerical solutions of the Bogoliubov-de Gennes equations on fully disordered systems. We focus primarily on the globally particle-hole symmetric model which has been the subject of considerable controversy, and give evidence that a zero-energy delta function exists in the DOS. The anomalous spectral weight at zero energy is seen to arise from resonant impurity states belonging to a particular sublattice, exactly as in the 2-impurity version of this model. We discuss the implications of these findings for realistic models of the cuprates.
Cite
@article{arxiv.cond-mat/0301630,
title = {Quantum interference in nested d-wave superconductors: a real-space perspective},
author = {W. A. Atkinson and P. J. Hirschfeld and Lingyin Zhu},
journal= {arXiv preprint arXiv:cond-mat/0301630},
year = {2009}
}
Comments
12 pages, 10 figs, submitted to Phys. Rev. B