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A dynamical theory which accounts for all microscopic one-electron processesis used to study the spectral function of the 1D Hubbard model for the whole$(k, \omega)$-plane, beyond previous studies which focused on the weightdistribution in the vicinity of the singular branch lines only. While ourpredictions agree with those of the latter studies concerning thetetracyanoquinodimethane (TCNQ) related singular features in photoemission ofthe organic compound tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ)metallic phase, the generalized theory also leads to quantitative agreementconcerning the tetrathiafulvalene (TTF) related finite-energy spectralfeatures, which are found to correspond to a value of the on-site repulsion $U$larger than for TCNQ. Our study reveals the microscopic mechanisms behind theunusual spectral features of TTF-TCNQ and provides a good overall descriptionof those features for the whole $(k, \omega)$-plane.

The TTF finite-energy spectral features in photoemission of TTF-TCNQ: The Hubbard-chain description