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- W4225905903 abstract "Plasmonics in topological semimetals offer exciting opportunities for fundamental physics exploration as well as for technological applications. Here, we investigate plasmons in the exemplar chiral crystal CoSi, which hosts a variety of multifold fermionic excitations. We show that CoSi hosts two distinct plasmon modes in the infrared regime at 0.1 and 1.1 eV in the long-wavelength limit. The 0.1 eV plasmon is found to be highly dispersive, and it originates from intraband collective oscillations associated with a double spin-1 excitation, while the 1.1 eV plasmon is dispersionless and it involves interband correlations. Both plasmon modes lie outside the particle-hole continuum and possess a long lifetime. Our study indicates that the CoSi class of materials will provide an interesting materials platform for exploring fundamental and technological aspects of topological plasmonics." @default.
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- W4225905903 date "2022-04-05" @default.
- W4225905903 modified "2023-09-30" @default.
- W4225905903 title "Collective plasmonic modes in the chiral multifold fermionic material CoSi" @default.
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- W4225905903 doi "https://doi.org/10.1103/physrevb.105.165104" @default.
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