Fig. 1: Schematics and electrical responses of piezoelectrically excited acoustic resonant cavities which consisting of single layer X-cut LN and inversed and twisted bilayer lithium niobate layers (ITBLN).
From: Twist piezoelectricity: giant electromechanical coupling in magic-angle twisted bilayer LiNbO3
a Schematic of single layer X-cut LN structure, the wave packets consisting of arrows in red and blue color represents two orthogonal-polarized acoustic eigenmodes in LN, with longitudinal electric field piezoelectrically associated and provided by top and bottom electrode. b Schematic of ITBLN structure, the crystal cut of bilayer LN was set to make an opposite directing x-axis through inversion with z-axis and twisting. c Experimental admittance curves of single layer LN and ITBLN at different twisting angles, the thickness of both LN layers are 500 um, equaling to the total thickness of 1000 um of single layer LN.
