A1 Journal article (refereed)
Reducing the frequency of the Higgs mode in a helical superconductor coupled to an LC circuit (2023)

Lu, Y., Ilić, S., Ojajärvi, R., Heikkilä, T. T., & Bergeret, F. S. (2023). Reducing the frequency of the Higgs mode in a helical superconductor coupled to an LC circuit. Physical Review B, 108(22), Article 224517. https://doi.org/10.1103/PhysRevB.108.224517

JYU authors or editors

Heikkilä, Tero

Publication details

All authors or editors: Lu, Yao; Ilić, Stefan; Ojajärvi, Risto; Heikkilä, Tero T.; Bergeret, F. Sebastian

Journal or series: Physical Review B

ISSN: 2469-9950

eISSN: 2469-9969

Publication year: 2023

Publication date: 26/12/2023

Volume: 108

Issue number: 22

Article number: 224517

Publisher: American Physical Society (APS)

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevB.108.224517

Publication open access: Not open

Publication channel open access:

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/93024

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2212.11615

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 20. 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.

Keywords: superconductivity; superconductors; quasiparticles; spin (quantum mechanics); resonance

Free keywords: superconductivity; superconductors

Fields of science: