用于半导体量子点磁共振光探测的共面带状线天线设计
Coplanar stripline antenna design for optically detected magnetic resonance on semiconductor quantum dots
摘要：
我们报告的共面带状线天线的开发和测试，设计用于集成在磁光致发光实验中，允许相干控制限制在单个自组装半导体量子点的单个电子自旋。我们讨论了这种结构的设计标准，这是多功能的意义上说，它不仅作为微波传输，但也作为电顶栅和荫罩的单量子点光谱。我们目前的测试测量氢化非晶硅，证明电检测的磁共振使用的振荡磁场的平面内组件所产生的共面带状线天线必要的，由于特定的几何形状的量子点光谱。从使用商业电子自旋共振装置的参考测量结合模拟结构中的场分布的有限元计算，我们在量子点将被集成到设备中的位置处获得约0.2mT的平均磁场。相应的π脉冲时间为~0.3us，完全满足为量子点开发的高灵敏度光学自旋读出方案所设定的要求。
英文摘要：
We report on the development and testing of a coplanar stripline antenna that is designed for integration in a magneto-photoluminescence experiment to allow coherent control of individual electron spins confined in single self-assembled semiconductor quantum dots. We discuss the design criteria for such a structure which is multi-functional in the sense that it serves not only as microwave delivery but also as electrical top gate and shadow mask for the single quantum dot spectroscopy. We present test measurements on hydrogenated amorphous silicon, demonstrating electrically detected magnetic resonance using the in-plane component of the oscillating magnetic field created by the coplanar stripline antenna necessary due to the particular geometry of the quantum dot spectroscopy. From reference measurements using a commercial electron spin resonance setup in combination with finite element calculations simulating the field distribution in the structure, we obtain an average magnetic field of ~0.2mT at the position where the quantum dots would be integrated into the device. The corresponding pi-pulse time of ~0.3us fully meets the requirements set by the high sensitivity optical spin read-out scheme developed for the quantum dot.
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