Proposal for ultrafast switching of ferroelectrics using mid-infrared pulses

Abstract

I propose a method for ultrafast switching of ferroelectric polarization using mid-infrared pulses. This involves selectively exciting the highest frequency $A_1$ phonon mode of a ferroelectric material with an intense mid-infrared pulse. Large amplitude oscillations of this mode provides a unidirectional force to the lattice such that it displaces along the lowest frequency $A_1$ phonon mode coordinate because of a nonlinear coupling of the type $g{Q}_{\text{P}}{Q}_{\text{IR}}^2$ between the two modes. First principles calculations show that this coupling is large in 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 $A_1$ mode has a large $Q_{\text{P}}^3$ order anharmonicity, which causes a discontinuous switch of electric polarization as the pump amplitude is continuously increased.

References in corpus (3)

• Nonlinear lattice dynamics as a basis for enhanced superconductivity in YBa2Cu3O6.5
• Theory of nonlinear phononics for coherent light-control of solids
• Terahertz wave generation via optical rectification from multiferroic BiFeO3

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