Distribution of charge carriers at strong electron–phonon interaction and “vertical dispersion” in ARPES spectra of cuprates

Abstract

Abstract Strong electron–phonon interaction (EPI) generating spontaneous breaking translational symmetry (polarons formation) is acknowledged in lightly doped cuprates due to interpretation of broad bands in their ARPES and optical conductivity spectra. To study systems with strong EPI at significant carrier density we construct distribution suitable for carriers with momentum uncertainty. Obtained concentrations of carriers in different states are used to predict ARPES spectra of such systems. Doping evolution of spectra calculated and “vertical dispersion” in them demonstrate the excellent qualitative and quantitative agreement with those observed in cuprates. “Vertical dispersion” in undoped and essentially doped cuprates is understood from a single viewpoint.