Fig. 5: Correlation functions for different models.
From: Traces of electron-phonon coupling in one-dimensional cuprates
a Single-particle Green’s function. b Spin-spin correlation. c Charge density–density fluctuation correlation. d Spin-singlet superconducting pair-field correlation. Correlations for the Hubbard (black) and extended Hubbard (blue) models are plotted for comparison. The Hubbard-extended Holstein model (red) results were obtained for ω0 = 0.2th, g0 = 0.3th, and g1 = 0.15th. The straight line fits follow a power law decay ~r−K to extract effective Luttinger exponents for different correlation functions. Filled circles show data used for fitting9.
