"Amplitude mode oscillations in pump-probe photoemission spectra from a d-wave superconductor"

B. Nosarzewski: B. Moritz, J. K. Freericks, A. F. Kemper, and T. P. Devereaux; Physical Review B, 11/20/17.

Additional Authors: B. Moritz, J. K. Freericks, A. F. Kemper, and T. P. Devereaux

Abstract:

 

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.