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Related Experiment Videos

Pairing correlations on t-U-J ladders

Daul1, Scalapino, White

  • 1Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, USA.

Physical Review Letters
|September 16, 2000
PubMed
Summary
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Adding a nearest-neighbor exchange interaction (J) significantly enhances pairing correlations in the t-U Hubbard ladder. This finding is crucial for understanding cuprate systems and their charge-transfer properties.

Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • The Hubbard and t-J models are fundamental for understanding strongly correlated electron systems.
  • Investigating pairing correlations is key to comprehending superconductivity in materials like cuprates.

Purpose of the Study:

  • To investigate the impact of a nearest-neighbor exchange interaction (J) on pairing correlations in the t-U Hubbard ladder model.
  • To compare pairing correlations in the t-U-J model with the t-J model under specific conditions.

Main Methods:

  • Theoretical modeling of the t-U Hubbard ladder with an added nearest-neighbor exchange interaction (J).
  • Comparative analysis of pairing correlations between the t-U-J and t-J models, adjusting parameters to match spin gap values.

Main Results:

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  • Pairing correlations are significantly enhanced by the inclusion of J in the t-U Hubbard ladder.
  • Reducing the on-site Coulomb interaction (U) in the t-J model also enhances pairing correlations.
  • The t-U-J ladder exhibits larger pairing correlations than a t-J(eff) ladder with an equivalent spin gap.

Conclusions:

  • The nearest-neighbor exchange interaction (J) plays a crucial role in enhancing pairing correlations.
  • The charge-transfer nature of cuprate systems is highlighted as important for understanding these enhanced correlations.