Electrodynamics of spin waves in triplet superconductors

Spin triplet superconductors are among the most exotic of quantum materials, featuring a rich phenomenology including topological surface states, fractional vortices, and re-entrant superconducting phases. Fundamentally, spin triplet condensates are distinguished from their conventional spin singlet counterparts by the fact that they carry non-trivial spin quantum numbers, and are in a sense "magnetically ordered." In this talk, we discuss the dynamics of spin triplet condensates, and their ability to support collective modes corresponding to the long-wavelength precession of the superconducting vector order parameter which we show are analogous to spin waves in conventional magnetically ordered systems. We will discuss the interaction of these modes with classical electromagnetic fields, and show how they can readily be excited and detected using well-established microwave spin wave resonance techniques. In light of this, we propose that the detection of these modes offers a novel and direct means for the identification of spin triplet superconductivity, as well as possible applications in a new field of superconducting magnonics.