Spin dynamics in the second subband of a quasi-two-dimensional system studied in a single-barrier heterostructure by time-resolved Kerr rotation

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	Spin dynamics in the second subband of a quasi-two-dimensional system studied in a single-barrier heterostructure by time-resolved Kerr rotation
	Zhang, F ; Zheng, HZ ; Ji, Y ; Li, GR
刊名	epl
	2008
卷号	83 期号:4 页码:art. no. 47007
关键词	QUANTUM-WELLS
ISSN号	0295-5075
通讯作者	zhang, f, chinese acad sci, inst semicond, state key lab superlattices & microstruct, beijing 100083, peoples r china. 电子邮箱地址: hzzheng@red.semi.ac.cn
中文摘要	spin dynamics in the first and second subbands have been examined simultaneously by time resolved kerr rotation in a single-barrier heterostructure of a 500 nm thick gaas absorption layer. by scanning the wavelengths of the probe and pump beams towards the short wavelength in the zero magnetic field, the spin coherent time t-2(1)* in the 1st subband e-1 decreases in accordance with the d'yakonov-perel' (dp) spin decoherence mechanism. meanwhile, the spin coherence time t-2(2)* in the 2nd subband e-2 remains very low at wavelengths longer than 810 nm, and then is dramatically enhanced afterwards. at 803 nm, t-2(2)* (450 ps) becomes ten times longer than t-2(1)* (50 ps). a new feature has been discovered at the wavelength of 811nm under the bias of -0.3v (807nm under the bias of -0.6v) that the spin coherence times (t-2(1)* and t-2(2)) and the effective g factors (vertical bar g(e-1)vertical bar and vertical bar g(e-2)vertical bar) all display a sudden change, presumably due to the "resonant" spin exchange coupling between two spin opposite bands. copyright (c) epla, 2008.
学科主题	半导体物理
收录类别	SCI
资助信息	national basic research program of china 2006cb932801 2007cb924904 special research programs of the chinese academy of sciences the authors would like to thank z. c. niu for the sample growth. this work was in part supported by the national basic research program of china no. 2006cb932801 and no. 2007cb924904, and also by special research programs of the chinese academy of sciences.
语种	英语
公开日期	2010-03-08
内容类型	期刊论文
源URL	[http://ir.semi.ac.cn/handle/172111/6474]
专题	半导体研究所_中国科学院半导体研究所（2009年前）
推荐引用方式 GB/T 7714	Zhang, F,Zheng, HZ,Ji, Y,et al. Spin dynamics in the second subband of a quasi-two-dimensional system studied in a single-barrier heterostructure by time-resolved Kerr rotation[J]. epl,2008,83(4):art. no. 47007.
APA	Zhang, F,Zheng, HZ,Ji, Y,&Li, GR.(2008).Spin dynamics in the second subband of a quasi-two-dimensional system studied in a single-barrier heterostructure by time-resolved Kerr rotation.epl,83(4),art. no. 47007.
MLA	Zhang, F,et al."Spin dynamics in the second subband of a quasi-two-dimensional system studied in a single-barrier heterostructure by time-resolved Kerr rotation".epl 83.4(2008):art. no. 47007.