UNSPECIFIED. (2001) Optical conductivity of one-dimensional Mott insulators. PHYSICAL REVIEW LETTERS, 86 (4). pp. 680-683. ISSN 0031-9007

Abstract

We calculate the optical conductivity of one-dimensional Mott insulators at low energies using a field theory description. The square root singularity at the optical gap, characteristic of band insulators, is generally absent and appears only at the Luther-Emery point. We also show that only few particle processes contribute significantly to the optical conductivity over a wide range of frequencies and that the bare perturbative regime is recovered only at very large energies. We discuss possible applications of our results to quasi-one-dimensional organic conductors. DOI: 10.1103/PhysRevLett.86.680.

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