2016
DOI: 10.1038/srep20571
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Novel electronic ferroelectricity in an organic charge-order insulator investigated with terahertz-pump optical-probe spectroscopy

Abstract: In electronic-type ferroelectrics, where dipole moments produced by the variations of electron configurations are aligned, the polarization is expected to be rapidly controlled by electric fields. Such a feature can be used for high-speed electric-switching and memory devices. Electronic-type ferroelectrics include charge degrees of freedom, so that they are sometimes conductive, complicating dielectric measurements. This makes difficult the exploration of electronic-type ferroelectrics and the understanding o… Show more

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Cited by 32 publications
(23 citation statements)
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“…The magnitude of the polarization is very large, reaching 6.3 µC/cm 2 , which is 20 times as large as that estimated by the point charge model [53]. A molecular compound, α-ET 2 I 3 [57,58], and a transition metal oxide, LuFe 2 O 4 [59], are also known to show electronic ferroelectricity. Therefore, in TTF-CA, we can expect that the amplitude of the polarization P could be modulated in the subpicosecond time scale by a terahertz-electric-field pulse via intermolecular charge transfers.…”
Section: Electronic Ferroelectricitymentioning
confidence: 71%
See 1 more Smart Citation
“…The magnitude of the polarization is very large, reaching 6.3 µC/cm 2 , which is 20 times as large as that estimated by the point charge model [53]. A molecular compound, α-ET 2 I 3 [57,58], and a transition metal oxide, LuFe 2 O 4 [59], are also known to show electronic ferroelectricity. Therefore, in TTF-CA, we can expect that the amplitude of the polarization P could be modulated in the subpicosecond time scale by a terahertz-electric-field pulse via intermolecular charge transfers.…”
Section: Electronic Ferroelectricitymentioning
confidence: 71%
“…Thus, by using a terahertz electric-field pulse, we can not only achieve ultrafast polarization modulation, but also distinguish the effects of the spin-lattice and electron-lattice interactions involved in materials. Such a polarization modulation in electronic ferroelectrics has also been successfully performed in a 2D ET-based molecular compound, α-(ET) 2 I 3 [58].…”
Section: Discussionmentioning
confidence: 95%
“…Many studies concerning the photoinduced state have been reported especially in strongly correlated materials as well as semiconductors, demonstrating various ultrafast control of the refractive index or absorption coefficient by light. Such photoirradiation can also control nonlinear optical properties originated from χ (2) [2,3] in addition to the refractive index. This indicates the possibility that the figure of merit of nonlinear materials can optically be improved via the nonequilibrium state, and hence it is important toward future applications in nonlinear optical devices to search for materials showing gigantic and ultrafast change of the second order effect driven by the increase of χ (2) by light.…”
Section: Introductionmentioning
confidence: 99%
“…To obtain information about the ferroelectric polarization along the layers, the terahertz-pump optical-probe spectroscopy has recently been applied in the charge-order phase. The results demonstrate that the direction of the ferroelectric polarization was inclined from the b axis by ∼27°, which is parallel to the diagonal arrangement of A, B, and A' molecules [20] [ Fig. 1(c)].…”
mentioning
confidence: 91%