Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, and University of Chinese Academy of Sciences, Beijing, 100083, China.
State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, and University of Chinese Academy of Sciences, Beijing, 100083, China.
Sci Rep. 2017 Jan 13;7:40558. doi: 10.1038/srep40558.
In the absent of magnetic field, we have observed the anisotropic spin polarization degree of photoconduction (SPD-PC) in (Ga,Mn)As/GaAs heterojunction. We think three kinds of mechanisms contribute to the magnetic related signal, (i) (Ga,Mn)As self-producing due to the valence band polarization, (ii) unequal intensity of left and right circularly polarized light reaching to GaAs layer to excite unequal spin polarized carriers in GaAs layer, and (iii) (Ga,Mn)As as the spin filter layer for spin transport from GaAs to (Ga,Mn)As. Different from the previous experiments, the influence coming from the Zeeman splitting induced by an external magnetic field can be avoided here. While temperature dependence experiment indicates that the SPD-PC is mixed with the magnetic uncorrelated signals, which may come from current induced spin polarization.
在无磁场的情况下，我们观察到（Ga,Mn）As/GaAs 异质结中光电导（SPD-PC）的各向异性自旋极化度。我们认为三种机制对磁相关信号有贡献：（i）由于价带极化，（Ga,Mn）As 自产生；（ii）左右圆偏振光到达 GaAs 层的强度不相等，从而激发 GaAs 层中不等的自旋极化载流子；（iii）（Ga,Mn）As 作为自旋输运的自旋过滤层，从 GaAs 到（Ga,Mn）As。与以前的实验不同，这里可以避免由外磁场引起的塞曼分裂的影响。而温度依赖实验表明，SPD-PC 与磁无关信号混合，这可能来自电流诱导的自旋极化。
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