Elusive electron-phonon coupling in quantitative analyses of the spectral function

Abstract

We examine multiple techniques for extracting information from angle-resolved photoemission spectroscopy (ARPES) data, and test them against simulated spectral functions for electron-phonon coupling. We find that, in the low-coupling regime, it is possible to extract self-energy and bare-band parameters through a self-consistent Kramers-Kronig bare-band fitting routine. We also show that the effective coupling parameters deduced from the renormalization of quasiparticle mass, velocity, and spectral weight are momentum dependent and, in general, distinct from the true microscopic coupling; the latter is thus not readily accessible in the quasiparticle dispersion revealed by ARPES.

A high-resolution version can be found at http://www.physics.ubc.ca/~quantmat/ARPES/PUBLICATIONS/Articles/KKBF.pdf

References in corpus (5)

• Efficient DMFT-simulation of the Holstein-Hubbard Model
• Green's function of a dressed particle
• Self-consistent self-energy analysis of photoemission data
• Bare electron dispersion from photoemission experiments
• Systematic improvement of the Momentum Average approximation for the Green's function of a Holstein polaron

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• Fermi blockade of the electron-phonon interaction: why strong coupling effects may not be seen in optimally doped high temperature superconductors