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
O. RöschMax-Planck-Institut für Festkörperforschung, D-70506 Stuttgart, GermanyO. GunnarssonMax-Planck-Institut für Festkörperforschung, D-70506 Stuttgart, GermanyXingjiang ZhouAdvanced Light Source, Lawrence Berkeley National Lab, Berkeley, California 94720, USAT. YoshidaDepartment of Physics and Department of Complexity Science and Engineering, University of Tokyo, Tokyo, 113-0033, JapanT. SasagawaDepartment of Advanced Materials Science, University of Tokyo, Tokyo, JapanA. FujimoriDepartment of Physics and Department of Complexity Science and Engineering, University of Tokyo, Tokyo, 113-0033, JapanZ. HussainAdvanced Light Source, Lawrence Berkeley National Lab, Berkeley, California 94720, USAZhi‐Xun ShenDepartment of Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USAS. UchidaDepartment of Physics and Department of Complexity Science and Engineering, University of Tokyo, Tokyo, 113-0033, Japan
2005lv
ABI
Аннотация
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.
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