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arXiv · 2212.01047

Surface Ferron Excitations in Ferroelectrics and Their Directional Routing

Xi-Han Zhou·Chengyuan Cai·Ping Tang·R. L. Rodríguez-Suárez·S. M. Rezende·G. E. W. Bauer·Tao Yu
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Abstract

The duality between the electric and magnetic dipoles inspires recent comparisons between ferronics and magnonics. Here we predict surface polarization waves or ``ferrons" in ferroelectric insulators, taking the long-range dipolar interaction into account. We predict properties that are strikingly different from the magnetic counterpart, \textit{i.e.} the surface ``Damon-Eshbach" magnons in ferromagnets. The dipolar interaction pushes the ferron branch with locked circular polarization and momentum to the ionic plasma frequency. The low-frequency modes are on the other hand in-plane polarized normal to their wave vectors. The strong anisotropy of the lower branch renders directional emissions of electric polarization and chiral near fields when activated by a focused laser beam, allowing optical routing in ferroelectric devices.

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Xi-Han Zhou, Chengyuan Cai, Ping Tang, R. L. Rodríguez-Suárez, S. M. Rezende, G. E. W. Bauer, Tao Yu. 2022-12-02. Surface Ferron Excitations in Ferroelectrics and Their Directional Routing. https://arxiv.org/abs/2212.01047

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