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Related Experiment Video

Updated: May 28, 2025

Evaluating Plasmonic Transport in Current-carrying Silver Nanowires
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Good plasmons in a bad metal.

Francesco L Ruta1,2, Yinming Shao1, Swagata Acharya3

  • 1Department of Physics, Columbia University, New York, NY, USA.

Science (New York, N.Y.)
|February 13, 2025
PubMed
Summary
This summary is machine-generated.

We observed long-lived hyperbolic plasmon polaritons (HPPs) in the correlated metal MoOCl2. These collective charge excitations persist despite a reconstructed Fermi surface, revealing new insights into many-body effects in plasmonics.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Plasmonics

Background:

  • Correlated metals exhibit high resistivity and can violate the Mott-Ioffe-Regel bound.
  • The behavior of collective charge excitations (plasmons) in these materials is debated, with conflicting evidence on whether they are overdamped or propagating.

Purpose of the Study:

  • To directly image and characterize plasmonic modes in the correlated van der Waals metal MoOCl2.
  • To investigate the influence of electronic correlations and Fermi surface reconstruction on plasmon behavior.

Main Methods:

  • Direct nano-optical imaging to visualize low-loss hyperbolic plasmon polaritons (HPPs).
  • Angle-resolved photoemission spectroscopy to probe the electronic structure and Fermi surface.
  • Analysis within the framework of many-body theory.

Main Results:

  • Direct visualization of remarkably long-lived hyperbolic plasmon polaritons (HPPs) in MoOCl2.
  • Observation of a highly anisotropic and reconstructed Fermi surface, partly incoherent due to electronic interactions.
  • HPPs were found to remain long-lived even with the modified Fermi surface.

Conclusions:

  • Hyperbolic plasmon polaritons in MoOCl2 are robust and long-lived.
  • The study provides direct evidence of many-body effects influencing plasmonic collective modes in correlated metals.
  • This work reconciles debates on plasmon behavior in such systems by demonstrating their persistence.