Dynamic Tilting of Ferroelectric Domain Walls Caused by Optically Induced Electronic Screening

Ahn, Youngjun; Everhardt, Arnoud S.; Lee, Hyeon Jun; Park, Joonkyu; Pateras, Anastasios; Damerio, Silvia; Zhou, Tao; DiChiara, Anthony; Wen, Haidan; Noheda, Beatriz; Evans, Paul G.

doi:10.1103/physrevlett.127.097402

Cited by 4 publications

(9 citation statements)

References 39 publications

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“…Longer-distance effects are associated with charge separation and depolarization field screening and carrier transport to domain boundaries. ,, The induced stress can lead to a structural distortion that develops over a time scale set by elastic waves propagating with longitudinal acoustic sound velocity . In ferroelectrics such as BiFeO 3 , PbTiO 3 , BaTiO 3 , and ferroelectric/dielectric superlattices, electronic excitation then produces an overall lattice expansion. ,− …”

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confidence: 99%

Subpicosecond Optical Stress Generation in Multiferroic BiFeO₃

et al. 2022

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Optical excitation leads to ultrafast stress generation in the prototypical multiferroic BiFeO 3 . The time scales of stress generation are set by the dynamics of the population of excited electronic states and the coupling of the electronic configuration to the structure. X-ray free-electron laser diffraction reveals high-wavevector subpicosecond-time scale stress generation following ultraviolet excitation of a BiFeO 3 thin film. Stress generation includes a fast component with a 1/e rise time with an upper limit of 300 fs and longer-rise time components extending to 1.5 ps. The contributions of the fast and delayed components vary as a function of optical fluence, with a reduced a fast-component contribution at high fluence. The results provide insight into stress-generation mechanisms linked to the population of excited electrons and point to new directions in the application of nanoscale multiferroics and related ferroic complex oxides. The fast component of the stress indicates that structural parameters and properties of ferroelectric thin film materials can be optically modulated with 3 dB bandwidths of at least 0.5 THz.

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Subpicosecond Optical Stress Generation in Multiferroic BiFeO₃

et al. 2022

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“…In BTO thin films, screening of the depolarization field leads to an increase in the polarization of the BTO layers and hence the BTO layers have expansive strain. [ 9 ] A similar effect likely applies to superlattices, and we thus expect ε BTO,depolarization to be positive. The negative value of r then indicates that there is a photoinduced compressive strain in the CTO layers.…”

Section: Resultsmentioning

confidence: 68%

“…For example, the screening of the depolarization field in SL heterostructures by excited charge carriers leads to transformations between domain configurations and to novel polarization states. [8][9][10][11][12][13] Charge carriers excited due to the above-bandgap optical excitation of the SL can result in depolarization-field screening, which can reduce the magnitude of the internal electric field polarizing the DE layers. This depolarizationfield-screening driven by optical excitation presents a promising way to modulate the polarization states of the FE/DE SL…”

Section: Optically Induced Picosecond Lattice Compression In the Diel...mentioning

confidence: 99%

Optically Induced Picosecond Lattice Compression in the Dielectric Component of a Strongly Coupled Ferroelectric/Dielectric Superlattice

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Ahn

et al. 2021

Adv Elect Materials

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Above‐bandgap femtosecond optical excitation of a ferroelectric/dielectric BaTiO3/CaTiO3 superlattice leads to structural responses that are a consequence of the screening of the strong electrostatic coupling between the component layers. Time‐resolved X‐ray free‐electron laser diffraction shows that the structural response to optical excitation includes a net lattice expansion of the superlattice consistent with depolarization‐field screening driven by the photoexcited charge carriers. The depolarization‐field‐screening‐driven expansion is separate from a photoacoustic pulse launched from the bottom electrode on which the superlattice is epitaxially grown. The distribution of diffracted intensity of superlattice X‐ray reflections indicates that the depolarization‐field‐screening‐induced strain includes a photoinduced expansion in the ferroelectric BaTiO3 and a contraction in CaTiO3. The magnitude of expansion in BaTiO3 layers is larger than the contraction in CaTiO3. The difference in the magnitude of depolarization‐field‐screening‐driven strain in the BaTiO3 and CaTiO3 components can arise from the contribution of the oxygen octahedral rotation patterns at the BaTiO3/CaTiO3 interfaces to the polarization of CaTiO3. The depolarization‐field‐screening‐driven polarization reduction in the CaTiO3 layers points to a new direction for the manipulation of polarization in the component layers of a strongly coupled ferroelectric/dielectric superlattice.

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“…A simple estimation using the known optical properties of PMN- x PT (Supporting Information) gives a temperature jump Δ T = 175 K for T init = 30 K and Δ T = 25 K for T init = 300 K. Finally we note also that the measured fluence-dependent response (Figure S5 in the Supporting Information) shows a roughly linear response up to the highest fluence measured (7.8 mJ/cm 2 ), consistent with this model. Additional electronic effects as have been observed in other studies ,− may be contributing separately to these responses, but one would expect depolarization-field screening effects, for example, to be less important within the disordered structure of the relaxors and for the freestanding films considered here.…”

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Light-Driven Ultrafast Polarization Manipulation in a Relaxor Ferroelectric

et al. 2022

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Relaxor ferroelectrics have been intensely studied for decades based on their unique electromechanical responses which arise from local structural heterogeneity involving polar nanoregions or domains. Here, we report first studies of the ultrafast dynamics and reconfigurability of the polarization in freestanding films of the prototypical relaxor 0.68PbMg1/3Nb2/3O3-0.32PbTiO3 (PMN-0.32PT) by probing its atomic-scale response via femtosecond-resolution, electron-scattering approaches. By combining these structural measurements with dynamic phase-field simulations, we show that femtosecond light pulses drive a change in both the magnitude and direction of the polarization vector within polar nanodomains on few-picosecond time scales. This study defines new opportunities for dynamic reconfigurable control of the polarization in nanoscale relaxor ferroelectrics.

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Dynamic Tilting of Ferroelectric Domain Walls Caused by Optically Induced Electronic Screening

Cited by 4 publications

References 39 publications

Subpicosecond Optical Stress Generation in Multiferroic BiFeO₃

Subpicosecond Optical Stress Generation in Multiferroic BiFeO₃

Optically Induced Picosecond Lattice Compression in the Dielectric Component of a Strongly Coupled Ferroelectric/Dielectric Superlattice

Light-Driven Ultrafast Polarization Manipulation in a Relaxor Ferroelectric

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Dynamic Tilting of Ferroelectric Domain Walls Caused by Optically Induced Electronic Screening

Cited by 4 publications

References 39 publications

Subpicosecond Optical Stress Generation in Multiferroic BiFeO3

Subpicosecond Optical Stress Generation in Multiferroic BiFeO3

Optically Induced Picosecond Lattice Compression in the Dielectric Component of a Strongly Coupled Ferroelectric/Dielectric Superlattice

Light-Driven Ultrafast Polarization Manipulation in a Relaxor Ferroelectric

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Subpicosecond Optical Stress Generation in Multiferroic BiFeO₃

Subpicosecond Optical Stress Generation in Multiferroic BiFeO₃