Calculation of an Enhanced A1g Symmetry Mode Induced by Higgs Oscillations in the Raman Spectrum of High-Temperature Cuprate Superconductors

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 nonlinear Raman-like process. The experimental nonequilibrium results on isotropic superconductors have been explained going beyond the BCS theory...

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Bibliographic Details
Published in:Physical review letters 2021-11, Vol.127 (19), p.197001
Main Authors: Puviani, M, S Ono, A Baum, Ando, Y, Hackl, R, Manske, D
Format: Article
Language:English
Subjects:
BCS theory
High temperature
Mathematical analysis
Oscillations
Raman spectroscopy
Spectrum analysis
Strong interactions (field theory)
Superconductors
Symmetry
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Summary: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 nonlinear Raman-like process. The experimental nonequilibrium 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.127.197001