Anomalous temperature dependence of the single-particle spectrum in the organic conductor TTF-TCNQ

H. Matsueda; N. Bulut; S. Maekawa; T. Tohyama

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Anomalous temperature dependence of the single-particle spectrum in the organic conductor TTF-TCNQ

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arxiv cond-mat/0603098 v1 pith:ZCNQUC5D submitted 2006-03-05 cond-mat.str-el

N. Bulut , H. Matsueda , T. Tohyama , S. Maekawa This is my paper

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keywords hubbardconductordependencemodelorganicphotoemissionsingle-particlespectral

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The angle-resolved photoemission spectrum of the organic conductor TTF-TCNQ exhibits an unusual transfer of spectral weight over a wide energy range for temperatures 60K<T<260K. In order to investigate the origin of this finding, here we report numerical results on the single-particle spectral weight A(k,omega) for the one-dimensional (1D) Hubbard model and, in addition, for the 1D extended Hubbard and the 1D Hubbard-Holstein models. Comparisons with the photoemission data suggest that the 1D Hubbard model is not sufficient for explaining the unusual T dependence, and the long-range part of the Coulomb repulsion also needs to be included.

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