Photoexcitation of a one-dimensional polarization-inverted domain from the charge-ordered ferroelectric ground state of (TMTTF)2PF6

Abstract

We theoretically revealed that a weak photoexcitation achieves the electric polarization-inversion with approximately 18% of all the charges, which was interpreted as a superimposition of multiexciton states, from the charge-ordered ferroelectric ground state of (TMTTF) 2 PF 6 at absolute zero temperature. Regarding a relative change of electric polarization (∆P/P ), the photoexcitation corresponds to 36%, which is much larger than ∆P/P of other typical organic materials. The value of ∆P/P ∼ 36% can be enlarged by a strong photoexcitation. This fact is useful not only for applications of this material and other analogous materials in optical devices but also for researches toward controlling electric polarizations by light, which is one of the recent attracting issues on photoinduced phase transition phenomena. The photoexcitation of ∆P/P ∼ 36% corresponds to the single peak of the optical conductivity in the low-energy region, which was also observed at 10 K. Theoretical calculations are based on a quarter-filled one-dimensional effective model with appropriate parameters and 50 unit cells.

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“…Terefore, a Delta P/P value similar to 36% can be expressed as being achieved in the early stages of the material's ultrafast photodynamics. Tis fact applies not only to the application of this material and other similar materials in optical devices but also to the study of electrical polarization controlled by light, which is one of the most attractive issues in the phenomenon of photoinduced phase transition [4]. However, the author only conducted relevant research on it theoretically and did not rely on a large number of practical operations, so the reliability of the article was not high.…”