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Circular photogalvanic effect at inter-band excitation in InN
Authors:Z Zhang  R Zhang  B Liu  ZL Xie  XQ Xiu  P Han  H Lu  YD Zheng  YH Chen  CG Tang  ZG Wang
Institution:1. Key Laboratory of Advanced Photonic and Electronic Materials and Department of Physics, Nanjing University, Nanjing 210093, China;2. Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Academy of Science, Beijing 100085, China;1. Key Laboratory of Metastable Materials Science and Technology, College of Material Science and Engineering, Yanshan University, Qinhuangdao 066004, China;2. Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China;1. College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China;2. Key Lab of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China;3. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;4. School of Energy and Power Engineering, Beihang University, Beijing 100191, China;5. Beijing Key Laboratory of Aero-Engine Structure and Strength, Beijing 100191, China;1. Institute of Physics, Faculty of Fundamental Problems of Technology, Wroclaw University of Technology, Wroclaw, Poland;2. Faculty of Electronics, Wroclaw University of Technology, Wroclaw, Poland;1. Terahertz Center, University of Regensburg, Regensburg, Germany;2. Ioffe Institute, St. Petersburg, Russia;3. Technische Physik University of Würzburg, Würzburg, Germany;4. University of St Andrews, St Andrews, United Kingdom
Abstract:The circular photogalvanic effect (CPGE) is observed in InN at inter-band excitation. The function of the CPGE induced current on laser helicity is experimentally demonstrated and illustrated with the microscopic model. A spin-dependent current obtained in InN is one order larger than in the AlGaN/GaN heterostructures at inter-band excitation. The dependence of CPGE current amplitude on light power and incident angle can be well evaluated with phenomenological theory. This sizeable spin-dependent current not only provides an opportunity to realize spin polarized current at room temperature, but also can be utilized as a reliable tool of spin splitting investigation in semiconductors.
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