Reducing the frequency of the Higgs mode in a helical superconductor coupled to an LC circuit

Yao Lu; Stefan Ilić; Risto Ojajärvi; Tero T. Heikkilä; F. Sebastian Bergeret

doi:10.1103/PhysRevB.108.224517

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Reducing the frequency of the Higgs mode in a helical superconductor coupled to an LC circuit

Yao Lu, Stefan Ilić, Risto Ojajärvi, Tero T. Heikkilä, F. Sebastian Bergeret

DOI 10.1103/PhysRevB.108.224517 · Physical Review B

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Abstract

We show that the amplitude or Higgs mode of a superconductor with strong spin-orbit coupling and an exchange field, couples linearly to the electromagnetic field. Furthermore, by coupling such a superconductor to an LC resonator, we demonstrate that the Higgs resonance becomes a regular mode at frequencies smaller than the quasiparticle energy threshold 2Δ0. We finally propose and discuss a possible experiment based on microwave spectroscopy for an unequivocal detection of the Higgs mode. Our approach may allow visualizing Higgs modes also in more complicated multiband superconductors with a coupling between the charge and other electronic degrees of freedom.