（TMTTF）$_{2}$ PF $_{6}$电荷有序铁电基态极化反转畴的光激发
Photoexcitation of a polarization-inverted domain from the charge-ordered ferroelectric ground state of (TMTTF)$_{2}$PF$_{6}$
摘要：
我们从理论上揭示了在绝对零度下，弱光激发实现了从电荷有序的铁电基态的（TMTTF）$_{2}$ PF $_{6}$的所有电荷的近似$18\%$的极化反转，这被解释为多激子态的叠加.关于电极化的相对变化（$ΔP/P$），光激发对应于$36\%$，其远大于其它典型有机材料的$ΔP/P$。$ΔP/P\sim 36\%$的值可以通过强光激发来放大。这一事实不仅有助于该材料和其他类似材料在光学器件中的应用，而且有助于光控制电极化的研究，这是光诱导相变现象的最新热点之一。$ΔP/P\sim 36\%$的光激发对应于低能区的光电导单峰，在10 K时也观察到了这一现象。理论计算是基于四分之一填充的一维有效模型与适当的参数和50个单位细胞。
英文摘要：
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 multi-exciton states, from the charge-ordered ferroelectric ground state of (TMTTF)$_{2}$PF$_{6}$ at absolute zero temperature. Regarding a relative change of electric polarization ($ΔP/P$), the photoexcitation corresponds to $36\%$, which is much larger than $ΔP/P$ of other typical organic materials. The value of $ΔP/P\sim 36\%$ 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 $ΔP/P\sim 36\%$ 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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