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|
|Auteurs||Sénéchal D, Tremblay A-MS|
|Journal||Physical Review Letters|
|Année de publication||2004|
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.