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题名: Direct observation of coherent spin transfer processes in an InGaAs/GaAs quantum well via two-color time-resolved Kerr rotation measurements
作者: Ruan, XZ;  Sun, BQ;  Ji, Y;  Yang, W;  Zhao, JH;  Xu, ZY
发表日期: 2008
摘要: A two-color time-resolved Kerr rotation spectroscopy system was built, with a femtosecond Ti:sapphire laser and a photonic crystal fiber, to study coherent spin transfer processes in an InGaAs/GaAs quantum well sample. The femtosecond Ti:sapphire laser plays two roles: besides providing a pump beam with a tunable wavelength, it also excites the photonic crystal fiber to generate supercontinuum light ranging from 500 nm to 1600 nm, from which a probe beam with a desirable wavelength is selected with a suitable interference filter. With such a system, we studied spin transfer processes between two semiconductors of different gaps in an InGaAs/GaAs quantum well sample. We found that electron spins generated in the GaAs barrier were transferred coherently into the InGaAs quantum well. A model based on rate equations and Bloch-Torrey equations is used to describe the coherent spin transfer processes quantitatively. With this model, we obtain an effective electron spin accumulation time of 21 ps in the InGaAs quantum well.
KOS主题词: Electrooptical devices;  Optical fibers;  Fiber optic cables;  Electron paramagnetic resonance spectroscopy;  alpha-particle spectra;  Optical spectrometers;  Spectrum analysis;  Heterostructures;  asynchronous machines;  Temperature
刊名: SEMICONDUCTOR SCIENCE AND TECHNOLOGY
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:
Ruan, XZ ; Sun, BQ ; Ji, Y ; Yang, W ; Zhao, JH ; Xu, ZY .Direct observation of coherent spin transfer processes in an InGaAs/GaAs quantum well via two-color time-resolved Kerr rotation measurements ,SEMICONDUCTOR SCIENCE AND TECHNOLOGY,2008 ,23(7): Art. No. 075021
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