Optimal Routes to Ultrafast Polarization Reversal in Ferroelectric LiNbO3

We use the frozen phonon method to calculate the anharmonic potential energy surface and to model the ultrafast ferroelectric polarization reversal in LiNbO3 driven by intense pulses of THz light. Before stable switching of the polarization occurs, there exists a region of excitation field-strengths...

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Published in:arXiv.org 2023-12
Main Authors: R Tanner Hardy, Rosenbrock, Conrad, Hart, Gus L W, Johnson, Jeremy A
Format: Article
Language:English
Subjects:
Anharmonicity
Excitation
Ferroelectric materials
Ferroelectricity
Lithium niobates
Polarization
Potential energy
Switching
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Rosenbrock, Conrad
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Johnson, Jeremy A
description We use the frozen phonon method to calculate the anharmonic potential energy surface and to model the ultrafast ferroelectric polarization reversal in LiNbO3 driven by intense pulses of THz light. Before stable switching of the polarization occurs, there exists a region of excitation field-strengths where transient switching can occur, as observed experimentally [Physical Review Letters 118, 197601 (2017)]. By varying the excitation frequency from 4 to 20 THz, our modeling suggests that more efficient, permanent polarization switching can occur by directly exciting the soft mode at 7 THz, compared to nonlinear phononic-induced switching driven by exciting a high frequency mode at 18 THz. We also show that neglecting anharmonic coupling pathways in the modeled experiment can lead to significant differences in the modeled switching field strengths.
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subjects Anharmonicity
Excitation
Ferroelectric materials
Ferroelectricity
Lithium niobates
Polarization
Potential energy
Switching
title Optimal Routes to Ultrafast Polarization Reversal in Ferroelectric LiNbO3
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