Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-03-11
Phys. Rev. B 72, 012508 (2005) (4 pages)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 figures
Scientific paper
10.1103/PhysRevB.72.012508
We propose angle-resolved two-photon photoemission spectroscopy (AR-2PPES) as a technique to detect the location of the bottom of the upper Hubbard band (UHB) in two-dimensional insulating cuprates. The AR-2PPES spectra are numerically calculated for small Hubbard clusters. When the pump photon excites an electron from the lower Hubbard band, the bottom of the UHB is less clear, but when an electron in the nonbonding oxygen band is excited, the bottom of the UHB can be identified clearly, accompanied with additional spectra originated from the spin-wave excitation at half filling.
Maekawa Sasamichi
Onodera Hiroaki
Tohyama Takami
Tsutsui Kazuhiro
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