Spin injection in the multiple quantum-well LED structure with the Fe/AlO_x injector  

作　　者：Hao Wu HouZhi Zheng Jian Liu GuiRong Li Ping Xu Hui Zhu Hao Zhang JianHua Zhao 

机构地区：[1]Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing 100083, Peoples R China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2010年第4期649-653,共5页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Basic Research Program of China (Grant Nos. 2006CB932801, 2007CB924903 and 2007CB-924904);the Special Research Programs of Chinese Academy of Sciences, the Knowledge Innovation Program Project of Chinese Academy of Sciences (Grant No. KJCX.YW.W09);the National Natural Science Foundation of China (Grant Nos. 60836002, 10674130 and 60521001)

摘　　要：A spin-injection/-detection device has been fabricated based on the multiple quantum well light emitting diode (LED) structure. It is found that only a broad electroluminescence (EL) peak of a full width at half maximum of 8.6 nm appears at the wavelength of 801 nm in EL spectra with a circular luminescence polarization degree of 18%, despite PL spectra always show three well resolved peaks. The kinetic energy gained by injected electrons and holes in their drift along opposite directions broadens the EL peak, and makes three EL peaks converge together. The same process also destroys the injected spin polarization of electrons mainly dominated by the Bir-Aronov-Pikus spin relaxing mechanism.A spin-injection/-detection device has been fabricated based on the multiple quantum well light emitting diode (LED) structure. It is found that only a broad electroluminescence (EL) peak of a full width at half maximum of 8.6 nm appears at the wavelength of 801 nm in EL spectra with a circular luminescence polarization degree of 18%, despite PL spectra always show three well resolved peaks. The kinetic energy gained by injected electrons and holes in their drift along opposite directions broadens the EL peak, and makes three EL peaks converge together. The same process also destroys the injected spin polarization of electrons mainly dominated by the Bir-Aronov-Pikus spin relaxing mechanism.

关 键 词：SPINTRONICS spin injection light EMITTING DIODE MULTIPLE quantum well 

分 类 号：N[自然科学总论]