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Journal Article

Proposal for ultrafast switching of ferroelectrics using midinfrared pulses

MPS-Authors
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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;

External Resource

http://dx.doi.org/10.1103/PhysRevB.92.214303
(Publisher version)

http://arxiv.org/abs/1511.00149
(Preprint)

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Fulltext (public)

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

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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: https://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.