论文标题
使用基于量子点的混合装置在零磁场上使用量子点的混合设备对光螺旋的电气检测
Electrical Detection of Light Helicity using a Quantum Dots based Hybrid Device at Zero Magnetic Field
论文作者
论文摘要
光子螺旋依赖性光电流是根据嵌入基于GAAS的P-I-N二极管中的INGAAS/GAAS量子点的集合在设备上的零磁场上测量的。我们的主要目标是利用这些纳米对象中预期的长电子自旋松弛时间。在这些实验中，由于使用超薄磁性COFEB/MGO电极，不需要外部磁场，从而呈现垂直磁各向异性（PMA）。我们观察到在磁性磁滞之后的左右两极光中测量的光电流的清晰不对称性。在零磁场下，这种不对称的幅度随温度的升高而降低，并且可以通过偏见来控制。在设备作为光电探测器操作时，偏振分辨的光致发光是并联检测的。这证明了设备的多功能功能，并为量子点中电子的自旋松弛提供了宝贵的见解。
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.
