Remarkable site selectivity properties of the ARPES matrix element in Bi2Sr2CaCu2O8
Abstract
We show that the ARPES spectra for emission from the bonding as well as the antibonding Fermi surface sheet in Bi2Sr2CaCu2O8 (Bi2212) possess remarkable site selectivity properties in that the emission for photon energies less than 25 eV is dominated by p d 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 p d on O-sites) are effectively blocked by either 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 novel possibilities for exploiting energy dependent ARPES spectra for probing initial state characters in the cuprates.
Turn this paper into a full lesson
ArcXiv compiles a staged curriculum from this paper: 8-12 lessons across beginner → advanced, synthesised section guides, visuals, flashcards, a quiz, exercises, and on-demand deep dives per section. Grounded in the abstract, never invented.