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Theoretical study of angle-resolved two-photon photoemission in two-dimensional insulating cuprates

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arxiv cond-mat/0503267 v2 pith:67YU7RHS submitted 2005-03-11 cond-mat.str-el

H. Onodera , T. Tohyama , K. Tsutsui , S. Maekawa This is my paper
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keywords bandbottomhubbardangle-resolvedar-2ppescuprateselectroninsulating
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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.

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