Polaronic behavior of undoped high-Tc cuprates
O. R\"osch, O. Gunnarsson, X. J. Zhou, T. Yoshida, T. Sasagawa, A., Fujimori, Z. Hussain, Z.-X. Shen, S. Uchida
TL;DR
This paper investigates polaronic effects in undoped high-Tc cuprates using ARPES data and theoretical modeling, revealing strong electron-phonon coupling leading to polaron formation and matching experimental spectral features.
Contribution
It introduces a new method for calculating ARPES spectra in undoped systems and demonstrates the significance of electron-phonon interactions in cuprates.
Findings
Strong electron-phonon coupling in La2CuO4
Polaronic features observed in ARPES spectra
Calculated phonon side band width agrees with experiment
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 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.
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