Perturbation Approach to One-Particle Spectra and Charge Susceptibility of Two-Dimensional d-p Model

概要

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We investigate the two-di?nensional d-p model with use of'the perturbation nuethod for the half-filling. The self-energy is evaluated up to the second order with respect to the on-site Coulombinteraction U with the full motnenttrrn dependence included. Varying the transfer integrals,namely, the band width 14', the one-particle spectra are calculated. We obtain the three-peakstructure and the transfer of the spectral weight, which well correspond to experiments. However,the experimentally obtained small-mj behavior cannot be explained in our framework with onlythe on-site Coulomb interaction. The charge susceptibility is also calculated with the conservingapproximation. The charge susceptilcility is suppressed with increasing U/W. These resultssuggest the importance of the long-range Coulomb interaction near the Mott transition.
社団法人日本物理学会の論文
1997-05-15