Department of Physics, NCU
Title
Theory of Phase Transitions in Ferroelectric Superlattices
Speaker
Prof. Khian-Hooi Chew
Center for Theoretical Physics, Department of Physics, University of Malaya
Date 2016.07.06 (Wed.)
Time 14:30-16:30
Place S4-625
Abstract
Ferroelectric superlattices are currently a topic of active research because of their fundamental interests and potential applications. Superlattices are ideal model systems for investigating the interface physics of ferroelectrics. As the physical properties of ferroelectric superlattices can be dominated by the behavior at interfaces, a natural starting point is to construct a model for their interface structures.
In this talk, we first present our approach to understand the ferroelectricity of an interface structure based on the Landau-Ginzburg theory. An interface energy term is introduced in the free energy to capture the essential physics associated with polarization continuities or discontinuities, intermixing and local polarization coupling. The approach is extended to study the phase transition behaviors of ferroelectric-dielectric and ferroelectric-multiferroic superlattices. Finally, the current status and future directions of this work will be addressed.
References
[1] K.-H. Chew, Y. Ishibashi, F.G. Shin and H.L.W. Chan, J. Phys. Soc. Jpn. 72, 2364 (2003).
[2] K.-H. Chew, M. Iwata and F. G. Shin, Ferroelectrics Lett. Sect. 36, 12 (2009).
[3] K.-G. Lim, K.-H. Chew, L.-H. Ong, and M. Iwata, EPL (Europhysics Letters) 108, 67011 (2012).
[4] L.-H. Ong and K.-H Chew, Ferroelectrics, 450, 7, (2013).
[5] K.-G. Lim, K.-H. Chew, D. Y. Wang, L.-H. Ong and M. Iwata, EPL (Europhysics Letters) 108, 67011 (2014)