Optical conductivity of the one-dimensional dimerized Hubbard model at quarter filling

Abstract

We investigate the optical conductivity in the Mott insulating phase of the one-dimensional extended Hubbard model with alternating hopping terms (dimerization) at quarter band filling. Optical spectra are calculated for the various parameter regimes using the dynamical density-matrix renormalization group method. The study of limiting cases allows us to explain the various structures found numerically in the optical conductivity of this model. Our calculations show that the dimerization and the nearest-neighbor repulsion determine the main features of the spectrum. The on-site repulsion plays only a secondary role. We discuss the consequences of our results for the theory of the optical conductivity in the Bechgaard salts.

arXiv comment11 pages and 12 figures

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• Tomonaga-Luttinger parameters and spin excitations in the dimerized extended Hubbard model
• Photoexcitation of electronic instabilities in one-dimensional charge-transfer systems
• Photoexcitation of a polarization-inverted domain from the charge-ordered ferroelectric ground state of (TMTTF)${}_2$PF${}_6$
• Finite-size scaling of correlation functions in one-dimensional Anderson-Hubbard model