Plasmons in the Kagome metal CsV₃Sb₅.

ABSTRACT: Plasmon polaritons, or plasmons, are coupled oscillations of electrons and electromagnetic fields that can confine the latter into deeply subwavelength scales, enabling novel polaritonic devices. While plasmons have been extensively studied in normal metals or semimetals, they remain largely unexplored in correlated materials. In this paper, we report infrared (IR) nano-imaging of thin flakes of CsV₃Sb₅, a prototypical layered Kagome metal. We observe propagating plasmon waves in real-space with wavelengths tunable by the flake thickness. From their frequency-momentum dispersion, we infer the out-of-plane dielectric function ϵc that is generally difficult to obtain in conventional far-field optics, and elucidate signatures of electronic correlations when compared to d

SUBMITTER: Shiravi H 

PROVIDER: S-EPMC11199534 | biostudies-literature | 2024 Jun

REPOSITORIES: biostudies-literature