Misc,

Collective modes in singlet superconductors

, and .
(2012)cite arxiv:1211.7363 Comment: An addendum to our earlier paper titled "Higgs modes in D-wave Superconductors".

Abstract

A brief summary of collective mode excitations that can exist in singlet superconductors with irreducible representation $L$ is given. Such excitations may be classified as the coupled excitations of the charge density $\rho$ and the phase $$ of the order parameter, or of the amplitude $\Delta$ of order parameter. Each of these classes may be further characterized in the long wavelength limit by the irreducible representation $\ell$ of the excitation, which may or may not be the same as the ground state $L$.

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