Journal
OPTICS EXPRESS
Volume 23, Issue 21, Pages 27250-27259Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.027250
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Funding
- National Natural Science Foundation of China [60990313, 61006003, 61306120, 61474114, 11574302]
- 973 program [2012CB921304, 2013CB632805]
- Natural Science Foundation of Fujian [2014J05073]
- Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics [KF201405]
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Spin photocurrent spectra induced by Rashba-and Dresselhaus-type circular photogalvanic effect (CPGE) at inter-band excitation have been experimentally investigated in InGaAs/AlGaAs quantum wells at a temperature range of 80 to 290 K. It is found that, the sign of Rashba-type current reverses at low temperatures, while that of Dresselhaus-type remains unchanged. The temperature dependence of ratio of Rashba and Dresselhaus spin-orbit coupling parameters, increasing from -6.7 to 17.9, is obtained, and the possible reasons are discussed. We also develop a model to extract the Rashba-type effective electric field at different temperatures. It is demonstrated that excitonic effect will significantly influence the Rashba-type CPGE, while it has little effect on Dresselhaus-type CPGE. (C) 2015 Optical Society of America
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