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Proposal for ultrafast switching of ferroelectrics using midinfrared pulses

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Subedi,  Alaska
Theory of Complex Materials, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

Fulltext (public)

PhysRevB.92.214303.pdf
(Publisher version), 459KB

Supplementary Material (public)
There is no public supplementary material available
Citation

Subedi, A. (2015). Proposal for ultrafast switching of ferroelectrics using midinfrared pulses. Physical Review B, 92(21): 214303. doi:10.1103/PhysRevB.92.214303.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0029-6079-F
Abstract
I propose a method for ultrafast switching of ferroelectric polarization using midinfrared pulses. This involves selectively exciting the highest frequency A1 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 A1 phonon mode coordinate because of a nonlinear coupling of the type gQPQIR2 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 A1 mode has a large QP3 order anharmonicity, which causes a discontinuous switch of electric polarization as the pump amplitude is continuously increased.