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• W1989531068 abstract "Ferroelectrics sometimes show large electro-optical and non-linear optical effects, available for polarization rotation and frequency conversion of light, respectively. If the amplitude of ferroelectric polarization is modulated in the picosecond time domain, terahertz repetition of optical switching via electro-optical and non-linear optical effects would be achieved. Here we show that polarization amplitude can be rapidly modulated by a terahertz electric field in an organic ferroelectric, tetrathiafulvalene-p-chloranil (TTF-CA). In this compound, alternately stacked donor (TTF) and acceptor (CA) molecules are dimerized via the spin-Peierls mechanism, and charge transfer within each dimer results in a new type of ferroelectricity called electronic-type ferroelectricity. Using a terahertz field, the intradimer charge transfer is strongly modulated, producing a subpicosecond change in the macroscopic polarization, which is demonstrated by transient reflectivity and second-harmonic generation measurements. Subsequently, coherent oscillation of the dimeric molecular displacements occur, which is explained by the modulation of the spin moment of each molecule. Controlling ferroelectric polarization on a terahertz timescale is a challenge, because typically the domain-wall motion occurs on much longer time scales. Here, the authors achieve control over the electronic ferroelectricity in an organic material using a terahertz pump–probe technique." @default.
• W1989531068 created "2016-06-24" @default.
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• W1989531068 date "2013-10-17" @default.
• W1989531068 modified "2023-10-01" @default.
• W1989531068 title "Ultrafast modulation of polarization amplitude by terahertz fields in electronic-type organic ferroelectrics" @default.
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• W1989531068 doi "https://doi.org/10.1038/ncomms3586" @default.
• W1989531068 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3826650" @default.
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• W1989531068 hasPublicationYear "2013" @default.
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