title: Polaronic behavior of undoped high-T(c) cuprate superconductors from angle-resolved photoemission spectra.
abstract: We present angle-resolved photoemission spectroscopy (ARPES) data on undoped La2CuO4, indicating polaronic coupling between bosons and charge carriers. Using a shell model, we calculate the electron-phonon coupling and find that it is strong enough to give self-trapped polarons. We develop an efficient method for calculating ARPES spectra in undoped systems. Using the calculated couplings, we find the width of the phonon sideband in good agreement with experiment. We analyze reasons for the observed dependence of the width on the binding energy.
authors.affiliation: Max-Planck-Institut für Festkörperforschung, D-70506 Stuttgart, Germany.
authors.forename: O
authors.initials: O
authors.lastname: Rösch
authors.forename: O
authors.initials: O
authors.lastname: Gunnarsson
authors.forename: X J
authors.initials: XJ
authors.lastname: Zhou
authors.forename: T
authors.initials: T
authors.lastname: Yoshida
authors.forename: T
authors.initials: T
authors.lastname: Sasagawa
authors.forename: A
authors.initials: A
authors.lastname: Fujimori
authors.forename: Z
authors.initials: Z
authors.lastname: Hussain
authors.forename: Z-X
authors.initials: ZX
authors.lastname: Shen
authors.forename: S
authors.initials: S
authors.lastname: Uchida