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题名: Circular polarization of excitonic luminescence in CdTe quantum wells with excess electrons of different densities
作者: Hu CY;  Ossau W;  Tan PH;  Wojtowicz T;  Karczewski G;  Kossut J
发表日期: 2001
摘要: The circular polarization of excitonic luminescence is studied in CdTe/Cd1-xMgxTe quantum wells with excess electrons of low density in an external magnetic field. It is observed that the circular polarization of X and X- emissions has opposite signs and is influenced by the excess electron density. If the electron density is relatively high so that the emission intensity of the negatively charged excitons X- is much stronger than that of the neutral excitons X, a stronger circular polarization degree of both X and X- emissions is observed. We find that the circular polarization of both X- and X emissions is caused by the spin polarization of the excess electrons due to the electron-spin-dependent nature of the formation of X-. If the electron density is relatively low and the emission intensity of X- is comparable to that of X, the circular polarization degree of X and X- emissions is considerably smaller. This fact is interpreted as due to a depolarization of the excess electron spins, which is induced by the spin relaxation of X-.
KOS主题词: Gases;  Resonance
刊名: PHYSICAL REVIEW B
专题: 中国科学院半导体研究所(2009年前)_期刊论文

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推荐引用方式:
Hu CY; Ossau W; Tan PH; Wojtowicz T; Karczewski G; Kossut J .Circular polarization of excitonic luminescence in CdTe quantum wells with excess electrons of different densities ,PHYSICAL REVIEW B,2001 ,63(4):Art.No.045313
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