Friedel oscillations in a two-band Hubbard model for CuO chains

Abstract

Friedel oscillations induced by open boundary conditions in a two-band Hubbard model for CuO chains are numerically studied. We find that for physically realistic parameters and close to quarter filling, these oscillations have a 2k_F modulation according with experimental results on YBa_2Cu_3O_{7-delta}. In addition, we predict that, for the same parameters, as hole doping is reduced from quarter filling to half filling, Friedel oscillations would acquire a 4k_F modulation, typical of a strongly correlated electrons regime. The 4k_F modulation dominates also in the electron doped region. The range of parameters varied is very broad, and hence the results reported could apply to other cuprates and other strongly correlated compounds with quasi-one dimensional structures. On a more theoretical side, we stress the fact that the copper and oxygen subsystems should be described by two different Luttinger liquid exponents.

7 pages, 7 eps figures

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• Electrical Resistivity Anisotropy from Self-Organized One-Dimensionality in High-Temperature Superconductors
• Friedel Oscillations and Charge Density Waves in Chains and Ladders
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• Friedel Oscillations in the Open Hubbard Chain
• Spin Gap in a Doped Kondo Chain
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• Staggered liquid phases of the 1D Kondo-Heisenberg lattice model
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Cited by in corpus (3)

• Mott gap excitations in twin-free YBa2Cu3O7-d (Tc = 93 K) studied by RIXS
• Anderson impurity in the one-dimensional Hubbard model on finite size systems
• Charge-screening role of $c$-axis atomic displacements in YBa${}_2$Cu${}_3$O${}_{6+x}$ and related superconductors