Effect of nonlocal interactions on the disorder-induced zero-bias anomaly in the Anderson-Hubbard model

Hong Yi Chen, W. A. Atkinson, R. Wortis

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4 Citations (Scopus)

Abstract

To expand the framework available for interpreting experiments on disordered strongly correlated systems, and in particular to explore further the strong-coupling zero-bias anomaly found in the Anderson-Hubbard model, we ask how this anomaly responds to the addition of nonlocal electron-electron interactions. We use exact diagonalization to calculate the single-particle density of states of the extended Anderson-Hubbard model. We find that for weak nonlocal interactions the form of the zero-bias anomaly is qualitatively unchanged. The energy scale of the anomaly continues to be set by an effective hopping amplitude renormalized by the nonlocal interaction. At larger values of the nonlocal interaction strength, however, hopping ceases to be a relevant energy scale and higher energy features associated with charge correlations dominate the density of states.

Original languageEnglish
Article number235139
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number23
DOIs
Publication statusPublished - 2012 Jun 21

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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