Matrix element and strong electron correlation effects in ARPES from cuprates |
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| Institution: | 1. Department of Physics, Northeastern University, 110 Forsyth Street, Boston, MA 02115, USA;2. Institute of Physics, Tampere University of Technology, 33101 Tampere, Finland;1. Escola de Engenharia de Lorena, Universidade de São Paulo, Lorena, SP, 12600-970, Brazil;2. Instituto de Física, Universidade de São Paulo, Rua do Matão 1371, 05508-090, São Paulo, São Paulo, Brazil;1. Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA;2. Physics Department, University of California Berkeley, Berkeley, CA, 94720, USA;3. Materials Science and Engineering Department, Arizona State University AZ 85281, USA;4. Department of Physics and CXFEL Labs, Arizona State University, AZ, 85287, USA;1. CMPMS Department, Brookhaven National Laboratory, Upton, NY 11973, USA;2. Applied Physics Department, Yale University, New Haven, CT 06520, USA;3. LASSP, Cornell University, Ithaca, NY 14853, USA;4. School of Physics and Astronomy, University of St. Andrews, Fife KY16 9SS, Scotland UK;5. Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY 14853, USA |
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| Abstract: | We discuss selected results from our recent work concerning the angle-resolved photoemission (ARPES) spectra from the cuprates. Our focus is on developing an understanding of the effects of the ARPES matrix element and those of strong electron correlations in analyzing photointensities. With simulations on Bi2Sr2CaCu2O8+δ (Bi2212), we show that the ARPES matrix element possesses remarkable selectivity properties, such that by tuning the photon energy and polarization, emission from the bonding or the antibonding states can be enhanced. Moreover, at low photon energies (below 25 eV), the Fermi surface (FS) emission is dominated by transitions from just the O-atoms in the CuO2 planes. In connection with strong correlation effects, we consider the evolution with doping of the FS of Nd2−xCexCuO4±δ (NCCO) in terms of the t−t′−U Hubbard model Hamiltonian. We thus delineate how the FS evolves on electron doping from the insulating state in NCCO. The Mott pseudogap is found to collapse around optimal doping suggesting the existence of an associated quantum critical point. |
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