A1 Journal article (refereed)
Complete tunneling of acoustic waves between piezoelectric crystals (2023)

Geng, Z., & Maasilta, I. J. (2023). Complete tunneling of acoustic waves between piezoelectric crystals. Communications Physics, 6, Article 178. https://doi.org/10.1038/s42005-023-01293-y

JYU authors or editors

Geng, Zhuoran
Maasilta, Ilari

Publication details

All authors or editors: Geng, Zhuoran; Maasilta, Ilari J.

Journal or series: Communications Physics

eISSN: 2399-3650

Publication year: 2023

Publication date: 14/07/2023

Volume: 6

Article number: 178

Publisher: Springer Science and Business Media LLC

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1038/s42005-023-01293-y

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/88764

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2209.08287

Abstract

The mechanical displacements in piezoelectric materials carry along macroscopic electric fields, allowing tunneling of acoustic waves across a vacuum gap beyond the charge-charge interaction distance. However, no rigorous proof of complete acoustic wave tunneling has been presented, and the conditions to achieve complete tunneling have not been identified. Here, we demonstrate analytically the condition for such phenomenon for arbitrary anisotropic crystal symmetries and orientations, and that complete transmission of the incoming wave occurs at the excitation frequency of leaky surface waves. We also show that the complete transmission condition can be related to the surface electric impedance and the effective surface permittivity of the piezoelectric material, relevant to realize the complete tunneling experimentally. We support our findings with numerical results for the maximum power transmittance of a slow transverse wave tunneling between identical ZnO crystals. The results show that complete tunneling can be achieved for a large range of orientations.

Keywords: acoustics (phonics); surfaces; crystals; phonons; wave motion; electric fields

Free keywords: acoustics; optomechanics; surfaces, interfaces and thin films

Fields of science: