Phase diagram of thet−U−V1−V2model at quarter filling

2004/11/30 by Satoshi Ejima, Florian Gebhard, Satoshi Nishimoto +2
Materials Science · Physics and Astronomy · #Organic and Molecular Conductors Research #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.72.033101

published as Phys. Rev. B, 72, 033101 (2005) · 4 pages, 5 figures, sumitted to PRB

arxiv created 2005/01/25 · openalex publication_date 2005/07/05 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

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\text\ensuremath-V₂ plane: 2k_F- and 4k_F-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 K_\ensuremathρ. It is largest when V₁ and V₂ are frustrated, and K_\ensuremathρ=0.25 at the boundaries between the metallic phase and each of the two CDW phases.

Citations

• Tomonaga-Luttinger parameters for doped Mott insulators

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