Spectral function of the one-dimensional Hubbard model away from half filling

Abstract

We calculate the photoemission spectral function of the one-dimensional Hubbard model away from half filling using the dynamical density matrix renormalization group method. An approach for calculating momentum-dependent quantities in finite open chains is presented. Comparison with exact Bethe Ansatz results demonstrates the unprecedented accuracy of our method. Our results show that the photoemission spectrum of the quasi-one-dimensional conductor TTF-TCNQ provides evidence for spin-charge separation on the scale of the conduction band width.

REVTEX, 4 pages including 4 EPS figures (changed); correct chemical potential used to define excitation energies in figures and text

References in corpus (11)

• The spectral weight of the Hubbard model through cluster perturbation theory
• Dynamical density-matrix renormalization-group method
• Spectroscopic signatures of spin-charge separation in the quasi-one-dimensional organic conductor TTF-TCNQ
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