Helicity dependent photocurrent enabled by unpolarized radiation in a GaAs/Al0.3Ga0.7As two-dimensional electron system

被引:8
作者
Ma, Hui [1 ]
Jiang, Chongyun
Liu, Yu
Yu, Jinling
Chen, Yonghai
机构
[1] Chinese Acad Sci, Inst Semicond, Key Lab Semicond Mat Sci, Beijing 100083, Peoples R China
基金
中国国家自然科学基金;
关键词
SPIN-ORBIT INTERACTION; QUANTUM-WELLS; SPECTRA;
D O I
10.1063/1.4808348
中图分类号
O59 [应用物理学];
学科分类号
摘要
We report the experimental observation of photo-assisted generation of helicity dependent photocurrents (PA-HDPC) in a GaAs/Al0.3Ga0.7As two-dimensional electron gas, which is distinct from the circular photogalvanic effect (CPGE). The PA-HDPC is generated under suppressed configuration of CPGE with the illumination of an obliquely incident unpolarized radiation in the system of C-2v point group symmetry. We suggest that the PA-HDPC originates from spin-orbit coupling as well as the CPGE. The unpolarized assisted radiation, instead of the circularly polarized radiation, imposes an asymmetric distribution of the spin-polarized carriers in the system and results in a helicity dependent photocurrent. (C) 2013 AIP Publishing LLC.
引用
收藏
页数:5
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