Pines' demon observed as a 3D acoustic plasmon in Sr₂RuO₄.

ABSTRACT: The characteristic excitation of a metal is its plasmon, which is a quantized collective oscillation of its electron density. In 1956, David Pines predicted that a distinct type of plasmon, dubbed a 'demon', could exist in three-dimensional (3D) metals containing more than one species of charge carrier¹. Consisting of out-of-phase movement of electrons in different bands, demons are acoustic, electrically neutral and do not couple to light, so have never been detected in an equilibrium, 3D metal. Nevertheless, demons are believed to be critical for diverse phenomena including phase transitions in mixed-valence semimetals², optical properties of metal nanoparticles³, soundarons in Weyl semimetals⁴ and high-temperature superconductivity in, for exa

SUBMITTER: Husain AA 

PROVIDER: S-EPMC10482684 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature