Optical Transition Linewidths due to Piezoelectric Phonon Scattering in Two-Dimensional Electron Systems

摘要

Utilizing the optical transition formula derived by a projection method on the linear response scheme, we obtain the optical transition linewidths for the electron system in square well due to piezoelectric phonon scattering in CdS and ZnS. We find that the widths increase with the temperature, but decrease as the well width increases for both materials. We also find that the widths decrease as the electron density increases, and the widths in CdS are larger than those in ZnS since the average electromechanical coupling constant is larger.