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Despite over two decades of intense research efforts, the origin ofhigh-temperature superconductivity in the copper oxides remains elusive.Angle-resolved photoemission experiments (ARPES) revealed a kink in thedispersion relations (energy vs. wavevector) of electronic states in thecuprates at binding energies of 50-80 meV, and raised the hope that thisanomaly could be key to understanding high-temperature superconductivity. Thekink is often interpreted in terms of interactions between the electrons and abosonic field. While there is no consensus on the nature of the bosons or evenwhether a boson model is appropriate, phonons and spin fluctuations havealternatively been proposed as possible candidates. Here we reportstate-of-the-art first-principles calculations of the role of phonons and theelectron-phonon interaction in the photoemission spectra of La2-xSrxCuO4(LSCO). Our study demonstrates that the phonon-induced renormalization of theelectron energies and the Fermi velocity is almost one order of magnitudesmaller than the effect observed in photoemission experiments. Hence, thepresent finding rules out electron-phonon interaction in bulk LSCO as thepossible origin of the measured kink. This result should bear on severalproposed theories of high temperature superconductivity in addition to theoriesconcerning the origin of kinks in cuprate photoemission data.

Electron-phonon interaction alone does not explain the photoemission kink in cuprate superconductors