Abstract
A comparative experimental study of the low-energy optical properties of different two-dimensional organic conductors is presented; this includes two-dimensional metals with 1 2 , 1 4 , and 1 5 filling of the conduction band. In 1 2 -filled compounds indications of the metal-to-insulator transition are observed for U close to some critical value. Also systems with 1 4 -filled bands cross over to a charge-ordered insulator for large intersite Coulomb repulsion V; but even close to this quantum-phase transitions, fluctuations become evident in the optical conductivity. For less commensurate filling factors, like 1 5 , the influence of charge order on the electronic properties decreases and the Drude contribution becomes more pronounced.
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