Abstract
Optical spectra of one-dimensional Mott insulators including CuO chains are studied theoretically. The midinfrared absorption spectrum has an asymmetric cusp-like singularity. We analyze this spectrum in terms of the phonon-assisted absorption in the quantum spin chain model. A good agreement between theory and experiments is obtained, and the singularity is identified with the van Hove singularity of the des Cloizeaux-Pearson modes.
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