Recent developments in the techniques of ultrafast pump-probe photoemission have made possible the search for collective modes in strongly correlated systems out of equilibrium. Including inelastic scattering processes and a retarded interaction, we simulate time- and angle- resolved photoemission spectroscopy (trARPES) to study the amplitude mode of a d-wave superconductor, a collective mode excited through the nonlinear light-matter coupling to the pump pulse. We find that the amplitude mode oscillations of the d-wave order parameter occur in phase at a single frequency that is twice the quasi-steady-state maximum gap size after pumping. We comment on the necessary conditions for detecting the amplitude mode in trARPES experiments.
@article{arxiv.1609.04080,
title = {Amplitude mode oscillations in pump-probe photoemission spectra from a d-wave superconductor},
author = {B. Nosarzewski and B. Moritz and J. K. Freericks and A. F. Kemper and T. P. Devereaux},
journal= {arXiv preprint arXiv:1609.04080},
year = {2017}
}