Deducing correlation parameters from optical conductivity in the Bechgaard salts

TL;DR

This paper uses numerical calculations and optical conductivity sum rules to estimate correlation parameters in Bechgaard salts, enhancing understanding of their electronic properties.

Contribution

It introduces a method to deduce correlation parameters from optical conductivity data in extended Hubbard models for Bechgaard salts.

Findings

Improved estimates of correlation parameters for TMTSF and TMTTF series.

Identification of model parameters consistent with experimental infrared data.

Enhanced understanding of electronic correlations in quasi-one-dimensional conductors.

Abstract

Numerical calculations of the kinetic energy of various extensions of the one-dimensional Hubbard model including dimerization and repulsion between nearest neighbours are reported. Using the sum rule that relates the kinetic energy to the integral of the optical conductivity, one can determine which parameters are consistent with the reduction of the infrared oscillator strength that has been observed in the Bechgaard salts. This leads to improved estimates of the correlation parameters for both the TMTSF and TMTTF series.