Acoustic wave tunneling across a vacuum gap between two piezoelectric crystals with arbitrary symmetry and orientation

TL;DR

This paper introduces a comprehensive formalism to analyze acoustic wave tunneling across vacuum gaps between arbitrarily oriented anisotropic piezoelectric crystals, enabling detailed study of wave transmission and reflection in complex materials.

Contribution

It presents a general approach to model and compute acoustic tunneling between anisotropic piezoelectric solids with arbitrary orientations, filling a gap in existing research.

Findings

Developed a formalism for acoustic tunneling in anisotropic piezoelectric crystals.

Demonstrated the approach with practical numerical examples.

Facilitated potential applications in heat transport and vibration physics.

Abstract

It is not widely appreciated that an acoustic wave can "jump" or "tunnel" across a vacuum gap between two piezoelectric solids, nor has the general case been formulated or studied in detail. Here, we remedy that situation, by presenting a general formalism and approach to study such an acoustic tunneling effect between two arbitrarily oriented anisotropic piezoelectric semi-infinite crystals. The approach allows one to solve for the reflection and transmission coefficients of all the partial wave modes, and is amenable to practical numerical or even analytical implementation, as we demonstrate by a few chosen examples. The formalism can be used in the future for quantitative studies of the tunneling effect in connection not only with the manipulation of acoustic waves, but with many other areas of physics of vibrations such as heat transport, for example.