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

TL;DR

This paper simulates time- and angle-resolved photoemission spectroscopy to study the amplitude mode oscillations in a d-wave superconductor, revealing in-phase oscillations at twice the maximum gap size after pumping.

Contribution

It introduces a simulation of trARPES including inelastic scattering and retarded interactions to analyze collective amplitude mode oscillations in a d-wave superconductor.

Findings

Amplitude mode oscillates at twice the maximum gap size.

Oscillations occur in phase at a single frequency.

Conditions for experimental detection are discussed.

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.