Pines’ demon observed as a 3D acoustic plasmon in Sr2RuO4

Husain, Ali A.; Huang, Edwin W.; Mitrano, Matteo; Rak, Melinda S.; Rubeck, Samantha I.; Guo, Xuefei; Yang, Hongbin; Sow, Chanchal; Maeno, Yoshiteru; Uchoa, Bruno; Chiang, Tai C.; Batson, Philip E.; Phillips, Philip W.; Abbamonte, Peter

doi:10.1038/s41586-023-06318-8

Pines’ demon observed as a 3D acoustic plasmon in Sr2RuO4

Journal Article · 09 August 2023 · Nature (London)

DOI:https://doi.org/10.1038/s41586-023-06318-8· OSTI ID:2419684

^[1]; ; ; Rak, Melinda S.; Rubeck, Samantha I.; Guo, Xuefei; Yang, Hongbin; Sow, Chanchal; Maeno, Yoshiteru; Uchoa, Bruno; ; ; ;

OSTI

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 semimetals⁴and high-temperature superconductivity in, for example, metal hydrides^3,5–7. Here, we present evidence for a demon in Sr₂RuO₄from momentum-resolved electron energy-loss spectroscopy. Formed of electrons in theβandγbands, the demon is gapless with critical momentumq_c = 0.08 reciprocal lattice units and room-temperature velocityv = (1.065 ± 0.12) × 10⁵m s⁻¹that undergoes a 31% renormalization upon cooling to 30 K because of coupling to the particle–hole continuum. The momentum dependence of the intensity of the demon confirms its neutral character. Our study confirms a 67-year old prediction and indicates that demons may be a pervasive feature of multiband metals.

Research Organization:: Rutgers Univ., Piscataway, NJ (United States); Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: SC0005132; SC0021238

OSTI ID:: 2419684

Journal Information:: Nature (London), Journal Name: Nature (London) Journal Issue: 7977 Vol. 621; ISSN 0028-0836

Publisher:: Nature Publishing Group

Country of Publication:: United States

Language:: English

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