Probing the pairing interaction and multiple Bardasis-Schrieffer modes using Raman spectroscopy

Abstract

In unconventional superconductors, understanding the form of the pairing interaction is the primary goal. In this regard, Raman spectroscopy is a very useful tool, as it identifies the ground state and also the subleading pairing channels by probing collective modes. Here we propose a general theory for multiband Raman response and identify new features in the spectrum that can provide a robust test for a pairing theory. We identify multiple Bardasis-Schrieffer type collective modes and connect the weights of these modes to the sub-leading gap structures within a microscopic pairing theory. The conclusions are completely general, and we apply our approach to interpret the B1g Raman scattering in hole-doped BaFe2As2.

5pp+7pp, 4 figures

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Cited by in corpus (27)

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• Bardasis-Schrieffer polaritons in excitonic insulators
• Nematicity and superconductivity: Competition versus cooperation
• Raman Study of Cooper Pairing Instabilities in (Li${}_{1-x}$Fe${}_x$)OHFeSe
• Phase signatures in third-harmonic response of Higgs and coexisting modes in superconductors
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• Many-body physics-induced selection rules: application to Raman spectroscopy
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• The role of orbital nesting in the superconductivity of Iron-based Superconductors
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• Universal nonanalytic features in response functions of anisotropic superconductors
• Raman response of collective modes in multicomponent superconductors
• Hybrid collective excitations in topological superconductor/ferromagnetic insulator heterostructures