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

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

1996-04-17

arxiv.org/abs/cond-mat/9604096v2

PRB 54 (1996) 2410 - 2420

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, revtex, replaced 5 ps figures, published in PRB

Scientific paper

10.1103/PhysRevB.54.2410

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 electron-phonon interaction, the spin correlation varies with filling as well as the charge correlation. Depending on the relation between cut-off energy scales of the Umklapp process and of the electron-phonon interaction, various phases appear. We found 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 which are interfered with the Umklapp process constructively or destructively depending on the character of electron-phonon coupling.

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