About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Mesoscale Phenomena in Functional Polycrystals and Their Nanostructures
|
| Presentation Title |
Photoinduced Modes of Oscillation in Mesoscopically Ordered Ferroelectrics |
| Author(s) |
Paul Evans |
| On-Site Speaker (Planned) |
Paul Evans |
| Abstract Scope |
Nanostructured ferroelectrics spontaneously develop mesoscopic order resulting from the competition of atomic-scale and long-range phenomena. The order includes the formation of domain patterns and polarization textures and has dramatic impacts on dynamics of the system. The photoinduced reconfiguration of the polarization and the new modes of oscillation arise from the mesoscopic polarization texture. In PbTiO<sub>3</sub>/SrTiO<sub>3</sub> superlattices, both striped nanodomains and Skyrmions exhibit modes of oscillation that arise from transient photoinduced screening of the depolarization field by ultrafast optical excitation, with temporal frequencies up to 1 THz. Ultrafast X-ray diffraction links the dynamics to the corresponding oscillation of the structure. The structural studies consistent with mesoscopic simulations, based on comparisons using predictions of the diffracted X-ray intensity based on the simulated spatial variation of the strain and polarization. The combination of rapid simulations and dynamical experiments has the potential to lead to the rapid discovery of novel modes of oscillations |