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 polarons. We develop an efficient method for calculating ARPES spectra in undoped systems. Using the calculated couplings, we find the width of the phonon side band in good agreement with experiment. We analyze reasons for the observed dependence of the width on the binding energy.
@article{arxiv.cond-mat/0504660,
title = {Polaronic behavior of undoped high-Tc cuprates},
author = {O. Rösch and O. Gunnarsson and X. J. Zhou and T. Yoshida and T. Sasagawa and A. Fujimori and Z. Hussain and Z. -X. Shen and S. Uchida},
journal= {arXiv preprint arXiv:cond-mat/0504660},
year = {2007}
}
Comments
4 pages, RevTeX, 5 eps figures, more material available at http://www.fkf.mpg.de/andersen/phonons/