Hot spots and pseudogaps for hole- and electron-doped high-temperature superconductors
| Titre | Hot spots and pseudogaps for hole- and electron-doped high-temperature superconductors |
| Type de publication | Journal Article |
| Nouvelles publications | 2004 |
| Auteurs | Sénéchal D, Tremblay A-MS |
| Journal | Physical Review Letters |
| Volume | 92 |
| Pagination | 126401/1-4 |
| Année de publication | 2004 |
| Résumé | Using cluster perturbation theory, it is shown that the spectral weight and pseudogap observed at the Fermi energy in recent angle resolved photoemission spectroscopy of both electron- and hole-doped high-temperature superconductors find their natural explanation within the t-t(')-t('')-U Hubbard model in two dimensions. The value of the interaction U needed to explain the experiments for electron-doped systems at optimal doping is in the weak to intermediate coupling regime where the t-J model is inappropriate. At strong coupling, short-range correlations suffice to create a pseudogap, but at weak-coupling long correlation lengths associated with the antiferromagnetic wave vector are necessary. |
