Journal or Book Title
Physical Review B
In angle-resolved photoelectron spectra of the antiferromagnetic insulators Ca2CuO2Cl2 and Sr2CuO2Cl2, a sharp drop of the spectral intensity of the lowest-lying band is observed along a line in k space equivalent to the Fermi surface of the optimally doped high-temperature superconductors. This was interpreted as a signature of the existence of a remnant Fermi surface in the insulating phase of the high-temperature superconductors. In this paper it is shown that the drop of the spectral intensity is not related to the spectral function but is a consequence of the electron-photon matrix element.
The American Physical Society
Haffner, S.; Brammeier, D. P.; Olson, C. G.; Miller, L. L.; and Lynch, David W., "No well-defined remnant Fermi surface in Sr2CuO2Cl2" (2001). Physics and Astronomy Publications. 115.