Phason modes in a spin-density wave in the presence of long-range Coulomb interaction

Attila Virosztek, Kazumi Maki

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Abstract

We study the effect of long-range Coulomb interaction on the phason in spin-density waves (SDW's) within mean-field theory. In the longitudinal limit and in the absence of SDW pinning, the phason is completely absorbed by the plasmon due to the Anderson-Higgs mechanism. In the presence of SDW pinning or when the wave vector q is tilted from the chain direction, though the plasmon still almost exhausts the optical sum rule, another optical mode appears at ω<2Δ(T), with small optical weight. This low-frequency mode below the SDW gap may be accessible to electron-energy-loss spectroscopy.

Original languageEnglish
Pages (from-to)6074-6077
Number of pages4
JournalPhysical Review B
Volume49
Issue number9
DOIs
Publication statusPublished - Jan 1 1994

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ASJC Scopus subject areas

  • Condensed Matter Physics

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