Hubbard-I approximation as a tool for study of superconducting properties of the Hubbard model with repulsive interaction

A. V. Rozhkov, A. L. Rakhmanov

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Usefulness of the Hubbard-I approximation for study of superconducting properties of the repulsive Hubbard model with large U is investigated. Electron pair correlation function for the Hubbard model is calculated with the help of generalized Hubbard-I approximation. We compare d-wave part of such correlation function with the equal-time d-wave propagator found in quantum Monte Carlo simulation. The both functions decay as a/r3 when separation r between the pair insertion and pair extraction points is large (coefficient a is independent of r). However, the Hubbard-I approximation underestimates coefficient a by a factor of the order of 2. Our work demonstrates that Hubbard-I approximation may be used as a simple yet reliable tool for investigating superconducting properties of the Hubbard model.

Original languageEnglish
Pages (from-to)S998-S999
JournalPhysica C: Superconductivity and its Applications
Volume470
Issue numberSUPPL.1
DOIs
Publication statusPublished - Dec 2010
Externally publishedYes

Keywords

  • Hubbard model
  • Hubbard-I approximation
  • Superconductivity

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