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When two piezoelectric solids are placed in close proximity, acoustic waves(phonons) can "tunnel" across a vacuum gap transmitting energy between the twosolids. Here, we demonstrate analytically that not only is such a phenomenonpossible, but that a simple resonance condition exists for which completetransmission of the incoming wave is possible, physically corresponding to theexcitation of leaky surface waves. This result is derived for an arbitraryanisotropic crystal symmetry and orientation. We also show that the completetransmission condition can be related to the surface electric impedance and theeffective surface permittivity of the piezoelectric material, making itpossible to be determined experimentally. In addition, we present numericalresults for the maximum power transmittance of a slow transverse wave,tunneling between identical ZnO crystals, as function of all possible crystalorientations. The results show a large range of orientations for which completetunneling can be achieved.

Complete tunneling of acoustic waves between closely spaced piezoelectric crystals