Plasmon resonances and tachyon ghost modes in highly conducting sheets
Name
PhysRevB.101.245136.pdf
Description
Published version
Size
937.93 KB
Format
Adobe PDF
Checksum (MD5)
f7ffde73b5276fed002340c2f783bafc
Author(s)
Oriekhov, DO
Levitov, LS
Date Issued
2020
Journal
Physical Review B
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
© 2020 American Physical Society. Plasmon-polariton modes in two-dimensional electron gases have a dual field-matter nature that endows them with unusual properties when electrical conductivity exceeds a certain threshold set by the speed of light. In this regime plasmons display an interesting relation with tachyons, the hypothetical faster-than-light particles. While not directly observable, tachyons directly impact properties of plasmon modes. Namely, in the "tachyon" regime, plasmon resonances remain sharp even when the carrier collision rate γ exceeds plasmon resonance frequency. Resonances feature a recurrent behavior as γ increases, first broadening and then narrowing and acquiring asymmetric non-Lorentzian line shapes with power-law tails extending into the tachyon continuum ω>ck. This unusual behavior can be linked to the properties of tachyon poles located beneath ω>ck branch cuts in the complex ω plane: as γ grows, tachyon poles approach the light cone and hybridize with plasmons. Narrow resonances persisting for γ>ω, along with the unusual density and temperature dependence of resonance frequencies, provide clear signatures of the tachyon regime.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevB.101.245136
