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

Mori, M, Tohyama, T, Maekawa, S et al. (2004). Friedel oscillations in a two-band Hubbard model for CuO chains . PHYSICAL REVIEW B, 69(1), 10.1103/PhysRevB.69.014513

cited authors

  • Mori, M; Tohyama, T; Maekawa, S; Riera, JA

authors

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 2kF modulation according with experimental results on YBa2Cu3O7−ʴ. 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 4kF modulation, typical of a strongly correlated electron regime. The 4kF modulation also dominates 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. © 2004 The American Physical Society.

publication date

  • January 28, 2004

published in

Digital Object Identifier (DOI)

volume

  • 69

issue

  • 1