Reducing the frequency of the Higgs mode in a helical superconductor coupled to an LC circuit
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
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Physical Review BDate
2023Copyright
©2023 American Physical Society
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.
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American Physical Society (APS)ISSN Search the Publication Forum
2469-9950Keywords
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https://converis.jyu.fi/converis/portal/detail/Publication/201935635
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Research Council of Finland; European CommissionFunding program(s)
Academy Project, AoF; FET Future and Emerging Technologies, H2020![](/themes/JYX2/images/funders/eu_logo_thumb.jpg)
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about funding
We acknowledge discussions with Miguel M. Ugeda. Y.L. and F.S.B. acknowledge financial support from the Spanish AEI through Projects PID2020- 114252GB-I00 (SPIRIT), and TED2021-130292B-C42, the Basque Government through Grant No. IT-1591-22 and the IKUR strategy program. F.S.B. also acknowledges the A. v. Humboldt Foundation. R.O. was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), TRR 288, 422213477 (Project No. A07). T.T.H. was supported by the Research Council of Finland (Projects No. 317118 and 354735). The work of T.T.H., F.S.B., and S.I. WAS partially funded by the European Union’s Horizon research and innovation program under Grant Agreement No. 800923 (SUPERTED project). F.S.B. thanks Prof. Björn Trauzettel and his group for their kind hospitality during his stay in Würzburg University.![showless](/themes/JYX2//images/showless.png)
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