零磁场下量子点混合器件对光螺旋度的电学探测
Electrical Detection of Light Helicity using a Quantum Dots based Hybrid Device at Zero Magnetic Field
摘要：
在零磁场条件下，在GaAs基p-i-n二极管中嵌入InGaAs/GaAs量子点系综的器件上测量了光子螺旋度相关的光电流。我们的主要目标是利用这些纳米物体中预期的长电子自旋弛豫时间。在这些实验中，不需要外部磁场，这是由于使用具有垂直磁各向异性（PMA）的磁性CoFeB/MgO电极。我们观察到一个明确的不对称性的光电流下测量相应的右和左偏振光，遵循的磁性层的磁滞。这种不对称性在零磁场的幅度随着温度的升高而减小，并且可以通过偏置来控制。偏振分辨的光致发光被并行检测，而该设备作为一个光电探测器操作。这证明了该设备的多功能能力，并对量子点中电子的自旋弛豫提供了有价值的见解。
英文摘要：
Photon helicity-dependent photocurrent is measured at zero magnetic field on a device based on an ensemble of InGaAs/GaAs quantum dots that are embedded into a GaAs-based p-i-n diode. Our main goal is to take advantage of the long electron spin relaxation time expected in these nano-objects. In these experiments, no external magnetic field is required thanks to the use of an ultrathin magnetic CoFeB/MgO electrode, presenting perpendicular magnetic anisotropy (PMA). We observe a clear asymmetry of the photocurrent measured under respective right and left polarized light that follows the hysteresis of the magnetic layer. The amplitude of this asymmetry at zero magnetic field decreases with increasing temperatures and can be controlled with the bias. Polarization-resolved photoluminescence is detected in parallel while the device is operated as a photodetector. This demonstrates the multifunctional capabilities of the device and gives valuable insights into the spin relaxation of the electrons in the quantum dots.
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