Comparison of Gain Properties with Electron--Electron and Electron--LO-Phonon Interactions in Quantum Cascade Structure
CHEN Gui-Chu1,2, FAN Guang-Han1
1Institute of Optoelectronic Material and Technology, South China Normal University, Guangdong 5106312Department of Physics, Zhao Qing University, Guangdong 526061
Comparison of Gain Properties with Electron--Electron and Electron--LO-Phonon Interactions in Quantum Cascade Structure
CHEN Gui-Chu1,2;FAN Guang-Han1
1Institute of Optoelectronic Material and Technology, South China Normal University, Guangdong 5106312Department of Physics, Zhao Qing University, Guangdong 526061
摘要The gain properties of (AlN)m/(GaN)n superlattice-based quantum cascade structure are investigated by using a nonequilibrium Green's function (NGF) theory. In this theory, the electron--electron interaction and electron--LO-phonon interaction are both considered. The gain spectra of QCL are 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.
Abstract：The gain properties of (AlN)m/(GaN)n superlattice-based quantum cascade structure are investigated by using a nonequilibrium Green's function (NGF) theory. In this theory, the electron--electron interaction and electron--LO-phonon interaction are both considered. The gain spectra of QCL are 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.
(Theory of electronic transport; scattering mechanisms)
引用本文:
CHEN Gui-Chu;FAN Guang-Han. Comparison of Gain Properties with Electron--Electron and Electron--LO-Phonon Interactions in Quantum Cascade Structure[J]. 中国物理快报, 2008, 25(5): 1815-1817.
CHEN Gui-Chu, FAN Guang-Han. Comparison of Gain Properties with Electron--Electron and Electron--LO-Phonon Interactions in Quantum Cascade Structure. Chin. Phys. Lett., 2008, 25(5): 1815-1817.
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2008, Vol. 25 
