Electronic Raman Scattering in Noncentrosymmetric Superconductors

We formulate a theory for the polarization dependence of the electronic (pair-breaking) Raman response for the recently discovered noncentrosymmetric superconductors in the clean limit at zero temperature. Possible applications include the systems CePt₃Si and Li₂Pd_xPt_3-xB which reflect the two important classes of the involved spin-orbit coupling. We provide analytical expressions for the Raman vertices for these two classes and calculate the polarization dependence of the electronic spectra. We predict a two-peak structure and different power laws with respect to the unknown relative magnitude of the singlet and triplet contributions to the superconducting order parameter, revealing a large variety of characteristic fingerprints of the underlying condensate.