Solid State Physics Laboratory, ETH Zurich, CH-8093 Zurich, Switzerland.
Phys Rev Lett. 2016 Apr 1;116(13):136803. doi: 10.1103/PhysRevLett.116.136803. Epub 2016 Mar 30.
We utilize electron counting techniques to distinguish a spin-conserving fast tunneling process and a slower process involving spin flips in AlGaAs/GaAs-based double quantum dots. By studying the dependence of the rates on the interdot tunnel coupling of the two dots, we find that as many as 4% of the tunneling events occur with a spin flip related to spin-orbit coupling in GaAs. Our measurement has a fidelity of 99% in terms of resolving whether a tunneling event occurred with a spin flip or not.
我们利用电子计数技术来区分在基于 AlGaAs/GaAs 的双量子点中，自旋守恒的快速隧穿过程和涉及自旋翻转的较慢过程。通过研究两个量子点之间的隧道耦合对速率的依赖性，我们发现多达 4%的隧穿事件与 GaAs 中的自旋轨道耦合相关的自旋翻转有关。我们的测量在分辨隧穿事件是否发生自旋翻转方面的保真度达到 99%。
