Hot Spots and Pseudogaps for Hole- and Electron-Doped High-Temperature Superconductors
David Sénéchal, A.-M. S. Tremblay
DOI 10.1103/PhysRevLett.92.126401 · Physical Review Letters
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Abstract
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.
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