Photoexcitation of a one-dimensional polarization-inverted domain from the charge-ordered ferroelectric ground state of (TMTTF ) 2 PF 6

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