Enhancement of pairing correlation and spin gap through suppression of single-particle dispersion in one-dimensional models

Masanori Kohno, Masatoshi Imada

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We investigate the effects of suppression of single-particle dispersion near the Fermi level on the spin gap and the singlet-pairing correlation by using the exact diagonalization method for finite-size systems. We consider strongly correlated one-dimensional models, which have flat band dispersions near wave number k = π/2, if the interactions are switched off. Our results for strongly correlated models show that the spin gap region expands as the single-particle dispersion becomes flatter. The region where the singlet-pairing correlation is the most dominant also expands in models with flatter band dispersions. Based on our numerical results, we propose a pairing mechanism induced by the flat-band dispersion.

Original languageEnglish
Pages (from-to)25-28
Number of pages4
Journaljournal of the physical society of japan
Volume69
Issue number1
DOIs
Publication statusPublished - 2000 Jan
Externally publishedYes

Keywords

  • Flat band
  • Single-particle dispersion
  • Spin gap
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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