Calculation of an enhanced A1g symmetry mode induced by Higgs oscillations in the Raman spectrum of high-temperature cuprate superconductors

TL;DR

This paper investigates how Higgs oscillations influence the A1g symmetry mode in the Raman spectrum of high-temperature cuprate superconductors, revealing a significant contribution and predicting measurable oscillations in THz experiments.

Contribution

It introduces a new theoretical approach to calculate the Higgs mode's Raman contribution in d-wave superconductors, considering many-body effects and predicting observable oscillations.

Findings

Higgs mode significantly affects A1g Raman intensity in d-wave superconductors.

Predicted measurable oscillations in THz quench-optical experiments.

Enhanced understanding of Higgs mode coupling in anisotropic superconductors.

Abstract

In superconductors the Anderson-Higgs mechanism allows for the existence of a collective amplitude (Higgs) mode which can couple to eV-light mainly in a non-linear Raman-like process. The experimental non-equilibrium results on isotropic superconductors have been explained going beyond the BCS theory including the Higgs mode. Furthermore, in anisotropic d-wave superconductors strong interaction effects with other modes are expected. Here we calculate the Raman contribution of the Higgs mode from a new perspective, including many-body Higgs oscillations effects and their consequences in conventional, spontaneous Raman spectroscopy. Our results suggest a significant contribution to the intensity of the A1g symmetry Raman spectrum in d-wave superconductors. In order to test our theory, we predict the presence of measurable characteristic oscillations in THz quench-optical probe time-dependent reflectivity experiments.