Theory of the optical conductivity of (TMTSF)${}_2$PF${}_6$ in the mid-infrared range

Abstract

We propose an explanation of the mid-infrared peak observed in the optical conductivity of the Bechgaard salt (TMTSF)${}_2$PF${}_6$ in terms of electronic excitations. It is based on a numerical calculation of the conductivity of the quarter-filled, dimerized Hubbard model. The main result is that, even for intermediate values of $U/t$ for which the charge gap is known to be very small, the first peak, and at the same time the main structure, of the optical conductivity is at an energy of the order of the dimerization gap, like in the infinite $U$ case. This surprising effect is a consequence of the optical selection rules.

10 pages, 9 uuencoded figures

References in corpus (3)

• Correlated Electrons in High Temperature Superconductors
• Charge gap in the one--dimensional dimerized Hubbard model at quarter-filling
• Deducing correlation parameters from optical conductivity in the Bechgaard salts

Cited by in corpus (12)

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• Metal-insulator transition and charge ordering in the extended Hubbard model at one-quarter filling
• Strong light-field effects driven by nearly single-cycle 7-fs light field in correlated organic conductors
• Ultrafast response of plasma-like reflectivity edge in (TMTTF)2AsF6 driven by 7-fs, 1.5-cycle strong-light field
• Optical conductivity of the one-dimensional dimerized Hubbard model at quarter filling
• Superconductivity and Antiferromagnetism in Quasi-one-dimensional Organic Conductors
• Memory-function approach to the normal-state optical properties of the Bechgaard salt (TMTSF)_2PF_6
• Role of Collective Mode for Optical Conductivity and Reflectivity in Quarter-Filled Spin-Density-Wave State
• Su-Schrieffer-Heeger-Hubbard model at quarter filling: effects of magnetic field and non-local interactions
• The optical conductivity for a spin-Peierls ground state of (TMTTF)${}_2$PF${}_6$ with tetramer formation