Harnessing ultraconfined graphene plasmons to probe the electrodynamics of superconductors

A. T. Costa, P. A. D. Gonçalves, D. N. Basov, Frank H. L. Koppens, N. Asger Mortensen*, N. M. R. Peres*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We show that the Higgs mode of a superconductor, which is usually challenging to observe by far-field optics, can be made clearly visible using near-field optics by harnessing ultraconfined graphene plasmons. As near-field sources we investigate two examples: graphene plasmons and quantum emitters. In both cases the coupling to the Higgs mode is clearly visible. In the case of the graphene plasmons, the coupling is signaled by a clear anticrossing stemming from the interaction of graphene plasmons with the Higgs mode of the superconductor. In the case of the quantum emitters, the Higgs mode is observable through the Purcell effect. When combining the superconductor, graphene, and the quantum emitters, a number of experimental knobs become available for unveiling and studying the electrodynamics of superconductors.
Original languageEnglish
Article numbere2012847118
JournalProceedings of the National Academy of Sciences of the United States of America
Volume118
Issue number4
Number of pages6
ISSN0027-8424
DOIs
Publication statusPublished - 2021

Keywords

  • Plasmons
  • Polaritons
  • Graphene
  • Superconductivity
  • Near-field microscopy

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