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 language | English |
|---|---|
| Pages (from-to) | 25-28 |
| Number of pages | 4 |
| Journal | journal of the physical society of japan |
| Volume | 69 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2000 Jan |
| Externally published | Yes |
Keywords
- Flat band
- Single-particle dispersion
- Spin gap
- Superconductivity
ASJC Scopus subject areas
- Physics and Astronomy(all)