Surface Cooper pair spin waves in triplet superconductors

TL;DR

This paper explores surface spin wave modes in triplet superconductors, showing how their unique electrodynamics can be used to identify triplet pairing through experimental detection of localized surface modes.

Contribution

It introduces a theoretical framework for surface spin waves in triplet superconductors, linking collective spin dynamics with electromagnetic responses, and proposes experimental detection methods.

Findings

Identification of surface spin wave modes localized at the superconductor surface.

Proposal of experimental techniques for detecting these surface modes.

Potential use of surface modes as signatures of triplet superconductivity.

Abstract

We study the electrodynamics of spin triplet superconductors including dipolar interactions, which give rise to an interplay between the collective spin dynamics of the condensate and orbital Meissner screening currents. Within this theory, we identify a class of spin waves that originate from the coupled dynamics of the spin-symmetry breaking triplet order parameter and the electromagnetic field. In particular, we study magnetostatic spin wave modes that are localized to the sample surface. We show that these surface modes can be excited and detected using experimental techniques such as microwave spin wave resonance spectroscopy or nitrogen-vacancy magnetometry, and propose that the detection of these modes offers a means for the identification of spin triplet superconductivity.