Intervalley Transfer, Plasma Frequency, and Plasmon-LO-Phonon Interaction inn-Type Gallium Antimonide

A theoretical study is made of the effects of intervalley transfer on the plasma frequency and plasmon-LO-phonon interaction in highly doped $n$-type gallium antimonide. Because of the difference in masses between the central and secondary valleys, both the plasma frequency and the plasmon-phonon interaction undergo large changes when an appreciable transfer from the central to the secondary valleys occurs as a result of raising the temperature from 0°K to room temperature.