CONTROL OF STATIC STRAINS IN CRYSTALS BY THE DYNAMIC PRESSURE OF PHONON FLOW

A novel approach to strain control in crystalline structures is propos ed, which utilizes surface acoustic wave excitation at varying acousti c amplitudes, W. Strain variation is achieved by the dynamic pressure of the phonon flow, which is proportional to W-2. Application of surfa ce acoustic waves to strained semiconductor heterostructure caused a d rastic reduction in the curvature of the atomic planes: a bent crystal became practically flat under a certain W value. Detailed data on pho non pressure effect on the curvature and the interplanar spacings were obtained by using high-resolution X-ray diffraction. (C) 1998 Elsevie r Science B.V.