| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advances in Multiphysics Modeling and Multi-modal Imaging of Functional Materials
|
| Presentation Title |
Analytical Model and Dynamical Phase-Field simulations of Terahertz Susceptibility in Ferroelectrics |
| Author(s) |
Yujie Zhu, Taorui Chen, Aiden Ross, Bo Wang, Xiangwei Guo, Venkatraman Gopalan, Long-Qing Chen, Jia-Mian Hu |
| On-Site Speaker (Planned) |
Yujie Zhu |
| Abstract Scope |
We develop analytical model and perform dynamical phase-field simulations to predict the linear and nonlinear dielectric susceptibilities of ionic polarization to continuous terahertz (THz) waves, as well as the resulting transmission, reflection, and absorption of THz wave. Using a perturbation method for solving the nonlinear equation of motion for ionic polarization within the framework of Landau-Ginzburg-Devonshire theory, the full second-order nonlinear susceptibility tensor is derived as a function of frequency, temperature, and strain. The theory predicts the coexistence of a significantly enhanced second-order dielectric susceptibility and a relatively low dielectric loss in BaTiO3 films with a strain-stabilized monoclinic ferroelectric phase and in a strained SrTiO3 film near its temperature-driven second-order ferroelectric-to-paraelectric phase transition. This work establishes a theoretical framework for predicting and exploiting nonlinear interactions between THz waves and ferroelectric materials, and more generally, suggests exciting opportunities to strain-engineer nonlinear dynamical properties of ferroelectrics beyond the static and quasi-static limits. |