We show that the angle-resolved photoemission (ARPES) spectra for emission from the bonding as well as the antibonding Fermi-surface sheet in Bi₂Sr₂CaCu₂O₈ possess remarkable site, selectivity properties, in that the emission for photon energies less than 25 eV is dominated by pd excitations from just the O sites in the CuO₂ planes. There is little contribution from Cu electrons to the ARPES intensity, even though the initial states at the Fermi energy contain an admixture of Cu-d and O-p electrons. We analyze the origin of this effect by considering the nature of the associated dipole matrix element in detail and find that various possible transition channels (other than pd on O sites) are effectively blocked by the fact that the related radial cross section is small and/or a lack of available final states. Our prediction that ARPES can preferentially sample Cu or O states by tuning the photon energy suggests different possibilities for exploiting energy dependent ARPES spectra for probing initial state characters in the cuprates.


Originally published in Physical Review B v.68 (2003): 054522. DOI: 10.1103/PhysRevB.68.054522


Bi₂Sr₂CaCu₂O₈, angle-resolved photoemission, ARPES, site selectivity properties

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Photoemission, Fermi surfaces




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Copyright 2003 American Physical Society

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