Phys. Rev. B 72, 033101 (2005) [4 pages]Phase diagram of the t-U-V1-V2 model at quarter fillingReceived 4 November 2004; revised 21 January 2005; published 5 July 2005 We examine the ground-state properties of the one-dimensional Hubbard model at quarter filling with Coulomb interactions between nearest-neighbors V1 and next-nearest neighbors V2. Using the density-matrix renormalization group and exact diagonalization methods, we obtain for U=10t three different phases in the V1-V2 plane: 2kF- and 4kF-charge-density-wave (CDW) and a broad metallic phase in between. Assuming that the metal is a Tomonaga-Luttinger liquid (TLL), we calculate the TLL parameter Kρ. It is largest when V1 and V2 are frustrated, and Kρ=0.25 at the boundaries between the metallic phase and each of the two CDW phases. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.033101
DOI:
10.1103/PhysRevB.72.033101
PACS:
71.10.Fd, 71.30.+h, 71.10.Hf
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