摘要
The gain properties of （A1N）m/（GaN）n superlattice-based quantum cascade structure axe investigated by using a nonequilibrium Green＇s function （NGF） theory. In this theory, the electron-electron interaction and electron- LO-phonon interaction axe both considered. The gain spectra of QCL axe calculated from some current-driven items, which are derived from these two interactions. The results show that the effect of the electron-electron interaction is notable in the low-photon-energy range and the electron-LO-phonon interaction only takes effect in the high-photon-energy range, where photon energy is close to or larger than LO-phonon energy of GaN materials.
The gain properties of （A1N）m/（GaN）n superlattice-based quantum cascade structure axe investigated by using a nonequilibrium Green＇s function （NGF） theory. In this theory, the electron-electron interaction and electron- LO-phonon interaction axe both considered. The gain spectra of QCL axe calculated from some current-driven items, which are derived from these two interactions. The results show that the effect of the electron-electron interaction is notable in the low-photon-energy range and the electron-LO-phonon interaction only takes effect in the high-photon-energy range, where photon energy is close to or larger than LO-phonon energy of GaN materials.
基金
Supported by the National Natural Science Foundation of China under Grant No 50602018, the Fund for Guangzhou Municipal LED R＆D Foundation under Grant No 2004U13D0021, and the Natural Science fund of Zhaoqing University.
