Optical conductivity of one-dimensional Mott insulators.
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.
Controzzi
D
D
Department of Physics, University of Oxford, United Kingdom.
Essler
F H
FH
Tsvelik
A M
AM