Effects of strong correlations and disorder in d-wave superconductors

Marcos Rigol, B. Sriram Shastry, Stephan Haas

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Abstract

We use exact diagonalization techniques to study the interplay between strong correlations, superconductivity, and disorder in a model system. We study an extension of the t-J model by adding an infinite-range d -wave superconductivity inducing term and disorder. Our work shows that in the clean case the magnitude of the order parameter is surprisingly small for low-hole filling, thus implying that mean-field theories might be least accurate in that important regime. We demonstrate that substantial disorder is required to destroy a d -wave superconducting state for low-hole doping. We provide the first bias free numerical results for the local density of states of a strongly correlated d -wave superconducting model, relevant for STM measurements at various fillings and disorders.

Original languageEnglish (US)
Article number052502
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number5
DOIs
StatePublished - Feb 2 2009

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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