Dependence of InAs phonon energy on misfit-induced strain

Abstract
The transverse‐optical (TO) phonon energy in strained InAs quantum wells has been investigated by using far‐infrared absorption. We observe that the TO phonon energy decreases when the misfit‐induced biaxial tension in the InAs single quantum well is increased. Our result shows a stronger phonon energy dependence on the strain than the one reported by Cerdeira et al. [Phys. Rev. B 5, 580 (1972)]. The discrepancy may be explained by stress relaxation near the surface in their experiment. The application of our result will be discussed.