Collective Coherent Control: Synchronization of Polarization in Ferroelectric<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>PbTiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>by Shaped THz Fields

Qi, Tingting; Shin, Young-Han; Yeh, Ka-Lo; Nelson, Keith A.; Rappe, Andrew M.

doi:10.1103/physrevlett.102.247603

Cited by 142 publications

(79 citation statements)

References 27 publications

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“…In fact, Qi et al have proposed a method for switching the polarization by driving large amplitude oscillations of this phonon mode using multiple THz pulses with an asymmetric electric field profile [5].…”

Section: Resultsmentioning

confidence: 99%

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Proposal for ultrafast switching of ferroelectrics using midinfrared pulses

Subedi

2015

Phys. Rev. B

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I propose a method for ultrafast switching of ferroelectric polarization using midinfrared pulses. This involves selectively exciting the highest frequency A 1 phonon mode of a ferroelectric material with an intense midinfrared pulse. Large amplitude oscillations of this mode provides a unidirectional force to the lattice such that it displaces along the lowest frequency A 1 phonon mode coordinate because of a nonlinear coupling of the type gQ P Q 2 IR between the two modes. First-principles calculations show that this coupling is large in perovskite transition-metal oxide ferroelectrics, and the sign of the coupling is such that the lattice displaces in the switching direction. Furthermore, I find that the lowest frequency A 1 mode has a large Q 3 P order anharmonicity, which causes a discontinuous switch of electric polarization as the pump amplitude is continuously increased.

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Section: Resultsmentioning

confidence: 99%

“…Therefore, an ultrashort light pulse cannot in general be used to switch the polarization of a ferroelectric material. Nevertheless, there have been several proposals for switching the polarization of ferroelectric materials using ultrashort light pulses by controlling their soft phonon modes [4,5].…”

Section: Introductionmentioning

confidence: 99%

Proposal for ultrafast switching of ferroelectrics using midinfrared pulses

Subedi

2015

Phys. Rev. B

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“…However, a large range of THz applications, ranging from ultrafast domain switching [9][10][11] to particle acceleration 12 , requires a giant leap in brightness to match the theoretically predicted needs in field strength being on the order of a few GV m À 1 . Intense THz radiation is mainly generated by employing electron accelerators [13][14][15] and laser-based systems.…”

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confidence: 99%

Demonstration of a low-frequency three-dimensional terahertz bullet with extreme brightness

2015

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The brightness of a light source defines its applicability to nonlinear phenomena in science. Bright low-frequency terahertz (o5 THz) radiation confined to a diffraction-limited spot size is a present hurdle because of the broad bandwidth and long wavelengths associated with terahertz (THz) pulses and because of the lack of THz wavefront correctors. Here using a present-technology system, we employ a wavefront manipulation concept with focusing optimization leading to spatio-temporal confinement of THz energy at its physical limits to the least possible three-dimensional light bullet volume of wavelength-cubic. Our scheme relies on finding the optimum settings of pump wavefront curvature and post generation beam divergence. This leads to a regime of extremely bright PW m À 2 level THz radiation with peak fields up to 8.3 GVm À 1 and 27.7 T surpassing by far any other system. The presented results are foreseen to have a great impact on nonlinear THz applications in different science disciplines.

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“…This onephoton absorption (1PA) process requires an infrared-active transition and a pump spectrum that covers the phonon frequency Ω=2π, typically between ∼1 and 40 THz [ Fig. 1(a)] [10][11][12][13]. To date, most works have implemented lattice excitation using stimulated Raman scattering (SRS) of a light pulse containing frequencies ω 0 1 and ω 0 2 ¼ ω 0 1 þ Ω, both at roughly 2π × 500 THz [ Fig.…”

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confidence: 99%

Terahertz Sum-Frequency Excitation of a Raman-Active Phonon

et al. 2017

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In stimulated Raman scattering, two incident optical waves induce a force oscillating at the difference of the two light frequencies. This process has enabled important applications such as the excitation and coherent control of phonons and magnons by femtosecond laser pulses. Here, we experimentally and theoretically demonstrate the so far neglected up-conversion counterpart of this process: THz sumfrequency excitation of a Raman-active phonon mode, which is tantamount to two-photon absorption by an optical transition between two adjacent vibrational levels. Coherent control of an optical lattice vibration of diamond is achieved by an intense terahertz pulse whose spectrum is centered at half the phonon frequency of 40 THz. Remarkably, the carrier-envelope phase of the THz pulse is directly transferred into the phase of the lattice vibration. New prospects in general infrared spectroscopy, action spectroscopy, and lattice trajectory control in the electronic ground state emerge.

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Collective Coherent Control: Synchronization of Polarization in FerroelectricPbTiO3by Shaped THz Fields

Cited by 142 publications

References 27 publications

Proposal for ultrafast switching of ferroelectrics using midinfrared pulses

Proposal for ultrafast switching of ferroelectrics using midinfrared pulses

Demonstration of a low-frequency three-dimensional terahertz bullet with extreme brightness

Terahertz Sum-Frequency Excitation of a Raman-Active Phonon

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