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We present angle-resolved photoemission spectroscopy (ARPES) data on undopedLa2CuO4, indicating polaronic coupling between bosons and charge carriers.Using a shell model, we calculate the electron-phonon coupling and find that itis strong enough to give polarons. We develop an efficient method forcalculating ARPES spectra in undoped systems. Using the calculated couplings,we find the width of the phonon side band in good agreement with experiment. Weanalyze reasons for the observed dependence of the width on the binding energy.

physical review letters

Polaronic Behavior of Undoped High-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:math>Cuprate Superconductors from Angle-Resolved Photoemission Spectra

Polaronic Behavior of Undoped High-TcCuprate Superconductors from Angle-Resolved Photoemission Spectra