Collective modes in charge-density waves and long-range Coulomb interactions

A. Virosztek, Kazumi Maki

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We study theoretically the collective modes in charge-density waves in the presence of long-range Coulomb interaction. We find that earlier works by Takada and his collaborators are inadequate since they introduced inconsistent approximations in evaluating a variety of correlation functions. The amplitude mode is unaffected by the Coulomb interaction, while the phase mode splits into the phason with linear dispersion (i.e., acoustic mode) and the optical mode with an energy gap in the presence of the Coulomb interaction. In particular, we establish the temperature dependence of the phason velocity v. A comparison with recent neutron-scattering data on the phason velocity in the charge-density wave of a single crystal of blue bronze K0.3MoO3 indicates that mean-field theory which includes the long-range Coulomb interaction gives an excellent description of the observed phason velocity.

Original languageEnglish
Pages (from-to)1368-1372
Number of pages5
JournalPhysical Review B
Volume48
Issue number3
DOIs
Publication statusPublished - 1993

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Charge density waves
Coulomb interactions
interactions
Mean field theory
Bronze
Neutron scattering
bronzes
Energy gap
Single crystals
neutron scattering
temperature dependence
acoustics
single crystals
approximation
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Collective modes in charge-density waves and long-range Coulomb interactions. / Virosztek, A.; Maki, Kazumi.

In: Physical Review B, Vol. 48, No. 3, 1993, p. 1368-1372.

Research output: Contribution to journalArticle

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