Angle-resolved photoemission spectra in one-dimensional Hubbard-Holstein model

摘要

In order to understand the effects of electron-phonon coupling and Coulomb interactions in angle-resolved photoemission spectroscopy(ARPES),a spin-1/2 Hubbard-Holstein model at half-filling is theoretically investigated by means of the mean field theory and classical Monte Carlo simulation method.It shows that the spectral shape of the one-dimensional system is significantly modified by the electron-phonon coupling and Coulomb interactions.The suppression of charge-density wave in one-dimensional system has been ascribed to the short-range Coulomb repulsion and thermal lattice fluctuations.The competition between these interactions can induce zero energy gaps in APPES as well as complete cancellation of charge or spin ordering.