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Dispersion of incoherent spectral features in systems with strong electron-phonon coupling

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  • O. Rösch
  • O. Gunnarsson

Abstract

We study (inverse) photoemission from systems with strong coupling of doped carriers to phonons. Using an adiabatic approximation, we develop a method for calculating spectra. This method is particularly simple for systems where the electron-phonon coupling can be neglected in the initial state, e.g., the undoped t-J model. The theory then naturally explains why the electron-phonon coupling just leads to a broadening of spectra calculated without electron-phonon coupling, without changing the dispersion. This is in agreement with recent angle-resolved photoemission spectroscopy (ARPES) on undoped cuprates, and it supports the interpretation in terms of strong electron-phonon interaction. The theory also shows that for systems with strong electron-phonon coupling in the initial state, the result cannot in general be related to the spectrum obtained without electron-phonon coupling. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Suggested Citation

  • O. Rösch & O. Gunnarsson, 2005. "Dispersion of incoherent spectral features in systems with strong electron-phonon coupling," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 43(1), pages 11-18, January.
    • Handle: RePEc:spr:eurphb:v:43:y:2005:i:1:p:11-18
    DOI: 10.1140/epjb/e2005-00022-x
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