Electronic Raman scattering in noncentrosymmetric superconductors.

Area of Science:

• Condensed Matter Physics
• Superconductivity Theory

Background:

• Noncentrosymmetric superconductors exhibit unique electronic properties due to broken inversion symmetry.
• Spin-orbit coupling plays a crucial role in the pairing mechanism of these materials.

Purpose of the Study:

• To develop a theoretical framework for the polarization-dependent Raman response in noncentrosymmetric superconductors.
• To identify characteristic spectral fingerprints for different classes of these materials.

Main Methods:

• Formulation of a theory for the electronic (pair-breaking) Raman response.
• Derivation of analytical expressions for Raman vertices considering spin-orbit coupling.
• Calculation of polarization dependence of electronic spectra at zero temperature in the clean limit.

Main Results:

• Prediction of a two-peak structure in the electronic Raman spectra.
• Identification of different power laws related to singlet and triplet contributions.
• Demonstration of distinct spectral features for CePt3Si and Li2PdxPt3-xB systems.

Conclusions:

• The theory provides a method to distinguish between different types of noncentrosymmetric superconductors.
• The predicted spectral features offer experimental probes into the nature of the superconducting order parameter.
• Understanding these fingerprints is key to characterizing novel superconducting condensates.