Acoustic and
diffuse mismatch theory
•Acoustic mismatch (AMM)
–perfect interface:
average transmission coefficient <t> given by differences in acoustic impedance, Z=rv
–lattice dynamics (LD)
incorporates microscopics
•Diffuse mismatch (DMM)
–disordered interface: <t> given by differences in densities of vibrational states
•Predicted large range of G not observed (2001)
•For similar materials, scattering decreases G
•For dissimilar materials, scattering increases G