Resonant optical control of the electrically induced spin polarization by periodic excitation
Resonant optical control of the electrically induced spin polarization by periodic excitation
复制标题
通过周期性激发电致自旋极化的共振光学控制
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. Bakarov
中科院分区：
文献类型：
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作者：
F. G. G. Hernandez;G. M. Gusev;A. Bakarov
我们证明了由电流产生的电子自旋极化可以通过周期性光激发来控制其方向和放大其幅度。将电学和光学自旋控制方法结合起来，实现了二维电子自旋控制。通过外部横向磁场中的kerr旋，我们证明了具有大自旋-轨道相互作用的系统中电流诱导信号的意外长寿命相干自旋振荡。使用单线性偏振脉冲进行自旋操纵和检测，我们发现脉冲光功率和样品温度对自旋有很强的依赖性，这表明空穴自旋在电子自旋初始化中的相关性。信号作为相对于注射接触位置的函数映射到霍尔条中。最后，通过旋转实验几何图形直接验证了平面内自旋极化的存在。
We show that the electron spin polarization generated by an electrical current may have its direction controlled and magnitude amplified by periodic optical excitation. The electrical and optical spin control methods were combinedandimplementedinatwo-dimensionalelectrongas.ByKerrrotationinanexternaltransversemagnetic field, we demonstrate unexpected long-lived coherent spin oscillations of the current-induced signal in a system with large spin-orbit interaction. Using a single linearly polarized pulse for spin manipulation and detection, we found a strong dependence on the pulse optical power and sample temperature indicating the relevance of the hole spin in the electron spin initialization. The signal was mapped in a Hall bar as function of the position relative to the injection contact. Finally, the presence of an in-plane spin polarization was directly verified by rotating the experimental geometry.