Unconventional charge-density waves driven by electron-phonon coupling

András Ványolos, Balázs Dóra, Attila Virosztek

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We report our study on unconventional charge-density waves (UCDW) (i.e., a charge-density wave with a wave vector dependent gap) in pure quasi-one-dimensional conductors. We develop a possible mechanism of establishment of such a low temperature phase, in which the driving force of the phase transition is the electron-phonon interaction with coupling depending on both the momentum transfer (q) and the momentum of the scattered electron (k). Mean field treatment is applied to obtain the excitation spectrum, correlation functions such as the density correlator and the optical conductivity, and the effective mass of the phase excitation. The fluctuation of the order parameter leads to the sliding of the UCDW as a whole. In the absence of impurities, we calculated the effect of this fluctuation on the optical properties. The inclusion of the collective mode significantly alters the optical conductivity, and leads to an effective mass which is nonmonotonic in temperature as opposed to conventional CDWs.

Original languageEnglish
Article number165127
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number16
DOIs
Publication statusPublished - May 10 2006

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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