Evolution of Bond-Order-Wave Phase in One-DimensionalMott Insulators

Abstract

In this paper, by using the level spectroscopy method andbosonization theory, we discuss the evolution of thebond-order-wave (BOW) phase in a one-dimensional half-filledextended Hubbard model with the on-site Coulomb repulsion U aswell as the inter-site Coulomb repulsion V and antiferromagneticexchange J. After clarifying the generic phase diagrams in threelimiting cases with one of the parameters being fixed at zeroindividually, we find that the BOW phase in the U-V phase diagramis initially enlarged as J increases from zero but is eventuallysuppressed as J increases further in the strong-coupling regime.A three-dimensional phase diagram is suggested where the BOW phaseexists in an extended region separated from the spin-density-waveand charge-density-wave phases.