Dynamics of the laser-induced ferroelectric excitation in BaTiO3 studied by x-ray diffraction

Istomin, K.; Kotaidis, Vassilios; Plech, Anton; Kong, Qinqyu

doi:10.1063/1.2430773

Cited by 15 publications

(13 citation statements)

References 24 publications

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“…This behavior is expected, when the excursion of the titanium (and oxygens) increases from the cell center. This displacement is, as seen above for the ISRS mechanism, as well as in an earlier study [13] not explained by a thermal excitation, but by an increase of the order parameter.…”

Section: Laser-induced Lattice Changessupporting

confidence: 65%

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Lattice Dynamics of Laser Excited Ferroelectric BaTiO₃

Issenmann¹,

Schleef²,

Ibrahimkutty³

et al. 2012

Acta Phys. Pol. A

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We investigated the lattice dynamics of the prototypic ferroelectric barium titanate close to its ferroelectric--paraelectric phase transition aiming at a better understanding of the atomistic nature of the transition. The usage of time-resolved X-ray techniques allows to disentangle lattice motion and unit cell changes, which, in part, relate to the ferroelectric polarization. In the quasi-static case both the electrical and the laser excitation show a mean-field, simple thermal behaviour, while for time scales shorter than nanoseconds the impulsive nature of the excitation becomes visible.

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Section: Laser-induced Lattice Changessupporting

confidence: 65%

“…To shed light on this phenomenon we have (i) studied non-thermal excitation pathways, such as laser excitation, and (ii) used a microscopic probe, as X-ray scattering, in order to resolve the atomic scale dynamics [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Lattice Dynamics of Laser Excited Ferroelectric BaTiO₃

Issenmann¹,

Schleef²,

Ibrahimkutty³

et al. 2012

Acta Phys. Pol. A

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“…To overcome these limitations, attempts have been made to drive the ferroelectric mode coherently with light pulses. These strategies, which have been based either on impulsive Raman scattering [4,5,6,7] or direct excitation of the ferroelectric mode [8,9,10] using THz radiation, have not yet been completely successful.Recent theoretical work [11] has analyzed an alternative route to manipulate the ferroelectric polarization on ultrafast timescales. It has been proposed that a coherent displacement of the ferroelectric mode could be achieved indirectly, by exciting a second, anharmonicallycoupled vibrational mode at higher frequency.…”

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confidence: 99%

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confidence: 99%

Ultrafast Reversal of the Ferroelectric Polarization

et al. 2017

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The ability to manipulate ferroelectrics at ultrafast speeds has long been an elusive target for materials research. Coherently exciting the ferroelectric mode with ultrashort optical pulses holds the promise to switch the ferroelectric polarization on femtosecond timescale, two orders of magnitude faster compared to what is possible today with pulsed electric fields.Here, we report on the demonstration of ultrafast optical reversal of the ferroelectric polarization in LiNbO 3 . Rather than driving the ferroelectric mode directly, we couple to it indirectly by resonant excitation of an auxiliary high-frequency phonon mode with femtosecond mid-infrared pulses. Due to strong anharmonic coupling between these modes, the atoms are directionally displaced along the ferroelectric mode and the polarization is transiently reversed, as revealed by time-resolved, phase-sensitive second-harmonic generation. This reversal can be induced in both directions, a key pre-requisite for practical applications. 2The ferroelectric polarization is typically controlled with static or pulsed electric fields.Switching is in this case an incoherent process, with speed limited to hundreds of picoseconds by the nucleation and growth of oppositely polarized domains [1,2,3]. To overcome these limitations, attempts have been made to drive the ferroelectric mode coherently with light pulses. These strategies, which have been based either on impulsive Raman scattering [4,5,6,7] or direct excitation of the ferroelectric mode [8,9,10] using THz radiation, have not yet been completely successful.Recent theoretical work [11] has analyzed an alternative route to manipulate the ferroelectric polarization on ultrafast timescales. It has been proposed that a coherent displacement of the ferroelectric mode could be achieved indirectly, by exciting a second, anharmonicallycoupled vibrational mode at higher frequency. The underlying mechanism is captured by the following minimal model, which is illustrated in Fig. 1. Consider a double well energy potential along the ferroelectric mode coordinate Q P as shown in Fig. 1Here, ω p is the frequency of the ferroelectric mode for a fixed temperature T below the Curie temperature T C . Take then a second mode Q IR with frequency ω IR , described by the Fig. 1(a), which is anharmonically coupled to the ferroelectric mode with a quadratic-linear dependence of the interaction energy aQ IR 2 Q P . The total lattice potential can then be written asIn equilibrium, Q P takes the value of one of the two minima of the double well potential Fig. 1(b). For finite displacements Q IR , this minimum is first displaced and then destabilized as Q IR exceeds a threshold value (colored lines in Fig. 1(b)).Importantly, the direction of this displacement is always pointed toward the opposite potential well and independent on the sign of Q IR [11].The corresponding dynamics of the two modes for resonant periodic driving of Q IR by a midinfrared light pulse is obtained by solving the equations of motionHere, f t) is the driving pulse ...

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“…Little is known about the coupling of these photogenerated currents to the structural response of ferroelectrics. In addition, the possibility of using light to drive structural changes has been of continuing interest [23][24][25][26][27].…”

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confidence: 99%