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000637916 1001_ $$aHoang, Le Phuong$$b0
000637916 245__ $$aUltrafast decoupling of polarization and strain in ferroelectric BaTiO$_3$
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000637916 520__ $$aA fundamental understanding of the interplay between lattice structure, polarization and electrons is pivotal to the optical control of ferroelectrics. The interaction between light and matter enables the remote and wireless control of the ferroelectric polarization on the picosecond timescale, while inducing strain, i.e., lattice deformation. At equilibrium, the ferroelectric polarization is proportional to the strain, and is typically assumed to be so also out of equilibrium. Decoupling the polarization from the strain would remove the constraint of sample design and provide an effective knob to manipulate the polarization by light. Here, upon above-bandgap laser excitation of the prototypical ferroelectric BaTiO$_3$, we induce and measure an ultrafast decoupling between polarization and strain that begins within 350 fs, by softening Ti-O bonds via charge transfer, and lasts for several tens of picoseconds. We show that the ferroelectric polarization out of equilibrium is mainly determined by photoexcited electrons, instead of the strain.
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000637916 7001_ $$aPesquera, David$$b1
000637916 7001_ $$aHinsley, Gerard N.$$b2
000637916 7001_ $$aCarley, Robert$$b3
000637916 7001_ $$aMercadier, Laurent$$b4
000637916 7001_ $$aTeichmann, Martin$$b5
000637916 7001_ $$00009-0002-7458-9666$$aUnterleutner, Elena Martina$$b6
000637916 7001_ $$aKnez, Daniel$$b7
000637916 7001_ $$aDienstleder, Martina$$b8
000637916 7001_ $$aGanguly, Saptam$$b9
000637916 7001_ $$aAsmara, Teguh Citra$$b10
000637916 7001_ $$aMerzoni, Giacomo$$b11
000637916 7001_ $$0P:(DE-H253)PIP1080125$$aParchenko, Sergii$$b12
000637916 7001_ $$aSchlappa, Justine$$b13
000637916 7001_ $$0P:(DE-H253)PIP1017718$$aYin, Zhong$$b14
000637916 7001_ $$aCaicedo Roque, José Manuel$$b15
000637916 7001_ $$00000-0003-4274-2101$$aSantiso, José$$b16
000637916 7001_ $$aSpasojevic, Irena$$b17
000637916 7001_ $$aCarinan, Cammille$$b18
000637916 7001_ $$aLee, Tien-Lin$$b19
000637916 7001_ $$0P:(DE-H253)PIP1007948$$aRossnagel, Kai$$b20
000637916 7001_ $$aZegenhagen, Jörg$$b21
000637916 7001_ $$aCatalan, Gustau$$b22
000637916 7001_ $$0P:(DE-H253)PIP1003481$$aVartanyants, Ivan A.$$b23
000637916 7001_ $$aScherz, Andreas$$b24
000637916 7001_ $$0P:(DE-H253)PIP1019735$$aMercurio, Giuseppe$$b25$$eCorresponding author
000637916 773__ $$0PERI:(DE-600)2553671-0$$a10.1038/s41467-025-63045-6$$gVol. 16, no. 1, p. 7966$$n1$$p7966$$tNature Communications$$v16$$x2041-1723$$y2025
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