Strong correlations lead to protected low energy excitations in disordered d-wave superconductors

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We show that strong correlations play a vital role in protecting low energy excitations in disordered high temperature superconductors. The impurity-induced low-energy density of states (DOS) is greatly reduced in the strongly correlated superconductor compared to d-wave Bogoliubov-deGennes theory. The gapless nodal quasiparticles, and the resulting `V' in the low-energy DOS, are much more robust against disorder compared to the large-gap antinodal excitations. We discuss the relevance of our results to angle-resolved photoemission and scanning tunneling spectroscopy experiments.
4 pages, 4 figures

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Strongly Correlated Electrons, Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/116083

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0609666
 http://arxiv.org/abs/cond-mat/0609666

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arXiv