Abstract: Provided herein are acoustic material (AM) CMRs having an active region including a conductive plate suspended over a cavity in a substrate and anchored to the substrate by two y-anchors, a piezoelectric layer disposed on the conductive plate, and an interdigitated metal structure (IDT) to cause transduction for excitement of a longitudinal mode of vibration of the AM CMR; and a pair of AM reflectors (AMRs) forming lateral anchors anchored to the substrate and attached to opposite sides of the conductive plate along the direction of vibration of the AM CMR, the AMRs each including a conductive anchor plate suspended over the cavity in the substrate, and a piezoelectric layer disposed on the conductive plate, and a parallel array of rods disposed on the piezoelectric layer, wherein the AMRs are configured to generate an acoustic stopband for inhibiting lateral leakage of the excited longitudinal mode of vibration.

Abstract: Provided herein are Ising machines having a resonant input mesh driven by a pump signal, a resonant output mesh coupled to the input mesh through a nonlinear component to form a parametric frequency divider (PFD), and the nonlinear component configured to passively activate, responsive to the pump signal exceeding a threshold power, a parametric oscillation between the input and output meshes having an oscillation frequency equal to half an angular input frequency of the pump signal, wherein an output signal of the PFD can be switched between an in-phase state and an out-of-phase state.

Abstract: An amorphous boron nitride compound may include a boron nitride compound, where the boron nitride compound may be amorphous and may be doped with carbon or hydrogen. In the boron nitride compound, a total content of the carbon or the hydrogen may be in a range of about 0.1 at % to about 35 at % of a total atomic content.