| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Surface Ferron Excitations in Ferroelectrics and Their Directional Routing |
| Xi-Han Zhou1, Chengyuan Cai1, Ping Tang2, R. L. Rodríguez-Suárez3, Sergio M. Rezende4, Gerrit E. W. Bauer5,6, and Tao Yu1* |
1School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
2WPI-AIMR, Tohoku University, 2-1-1 Katahira, 980-8577 Sendai, Japan
3Facultad de Física, Pontificia Universidad Católica de Chile, Casilla 306, Santiago, Chile
4Departamento de Física, Universidade Federal de Pernambuco, 50670-901, Recife, Pernambuco, Brazil
5WPI-AIMR and Institute for Materials Research and CSRN, Tohoku University, Sendai 980-8577, Japan
6Kavli Institute for Theoretical Sciences, University of the Chinese Academy of Sciences, Beijing 100190, China
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| Cite this article: |
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Xi-Han Zhou, Chengyuan Cai, Ping Tang et al 2023 Chin. Phys. Lett. 40 087103 |
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Abstract The duality between 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, 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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Received: 20 May 2023
Published: 05 August 2023
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| PACS: |
71.36.+c
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(Polaritons (including photon-phonon and photon-magnon interactions))
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77.55.-g
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(Dielectric thin films)
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43.35.Pt
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(Surface waves in solids and liquids)
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