Spin-gap phase in nearly half-filled one-dimensional conductors coupled with phonons

K. Yonemitsu, M. Imada

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Abstract

Asymptotic properties of nearly half-filled one-dimensional conductors coupled with phonons are studied through a renormalization-group method. Due to spin-charge coupling via an electron-phonon interaction, the spin correlation varies with filling as well as the charge correlation. Depending on the relation between cutoff energy scales of the umklapp process and of the electron-phonon interaction, various phases appear. We find a metallic phase with a spin gap and a dominant charge-density-wave correlation near half filling between a gapless density-wave phase (like in the doped repulsive Hubbard model) and a superconductor phase with a spin gap. The spin gap is produced by phonon-assisted backward scatterings that interfere with the umklapp process constructively or destructively depending on the character of electron-phonon coupling.

Original languageEnglish
Pages (from-to)2410-2420
Number of pages11
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume54
Issue number4
DOIs
Publication statusPublished - 1996 Jan 1

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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