The optical conductivity for a spin-Peierls ground state of (TMTTF)$_{2}$PF$_{6}$ with tetramer formation

TL;DR

This study theoretically analyzes the optical conductivity of (TMTTF)$_{2}$PF$_{6}$ in its spin-Peierls state, employing a tetramerized 1D extended Hubbard model to understand the effects of tetramer formation on optical properties.

Contribution

It provides a theoretical investigation of optical conductivity in a tetramerized spin-Peierls state using exact diagonalization, clarifying electronic excitation energies.

Findings

Identification of electronic photoexcitation energies from the spin-Peierls ground state.

Insights into how tetramerization influences optical properties.

Relevance to experimental observations of tetramer formation.

Abstract

We theoretically investigate the optical conductivity of (TMTTF)$_{2}$PF$_{6}$ in the spin-Peierls ground state within the framework of the exact diagonalization method at absolute zero temperature ($T=0$). As an effective model, a 1/4-filled 1D (one-dimensional) extended Hubbard model with tetramerization is employed. Using appropriate parameters of the model which have already been reported, we clarify the electronic photoexcitation energies from the spin-Peierls ground state. Since some experiments indicate the formation of a tetramer in the spin-Peierls ground state of (TMTTF)$_{2}$PF$_{6}$, our results are useful to understand the effects of tetramerization on the optical properties of (TMTTF)$_{2}$PF$_{6}$.