Theoretical Study on the Charge Gap of Organic Conductor - Bechgaard Salts -

Abstract

The charge gap in a quarter-filled organic conductor, which is induced by dimerization and/or alternating potential is studied by applying the renormalization group method to the bosonized one-dimensional Hamiltonian. The interplay of dimerization and alternating potential gives rise to the unconventional enhancement of the charge gap in addition to the on-site repulsive interaction. The experimental results of resistivity and optical conductivity in Bechgaard salts are examined based on the present calculation.