Enhancement of Pairing Correlation and Spin Gap through Suppression of Single-Particle Dispersion in One-Dimensional Models : Condensed Matter: Electronic Properties, etc.
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概要
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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 shows that the spin gap region expands as the single-article 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.
- 社団法人日本物理学会の論文
- 2000-01-15
著者
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Imada Masatoshi
Institute For Solid State Physics The University Of Tokyo
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Kohno Masanori
Mitsubishi Research Institute Inc.
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