论文标题
探测旋转的细节 - 通过Pauli Spin Blockade的轨道耦合
Probing details of spin--orbit coupling through Pauli spin blockade
论文作者
论文摘要
自旋 - 轨道相互作用（SOI）在许多低维半导体和杂交量子设备中起着基本作用。在半导体旋转量子位的快速发展的场中，SOI是一种必不可少的成分，可以允许超快控制。但是，在给定设备中SOI的确切表现通常很难在理论上和实验上预测探测。在这里，我们通过Pauli自旋封锁中的双量子点和系统中的基础SOI在泄漏电流之间建立了详细的理论联系。我们提出了泄漏电流的一般分析表达，该表达能够将可观察到的可观察到的特征连接到有效自旋的大小和方向 - 作用在移动载体上的轨道场。由于最近对基于孔的量子设备的兴趣很大，我们进一步放大了Pauli封锁孔旋转的情况，假设具有强大的横向限制潜力。在此极限中，我们还找到了低外部磁场处电流的分析表达，其中包括孔自旋对随机波动的核自旋浴的影响。该结果可用于提取有关超精细和自旋 - - 轨道耦合参数的详细信息，用于在具有很大一部分非零核自旋的设备中的孔自旋。
Spin--orbit interaction (SOI) plays a fundamental role in many low-dimensional semiconductor and hybrid quantum devices. In the rapidly evolving field of semiconductor spin qubits, SOI is an essential ingredient that can allow for ultrafast qubit control. The exact manifestation of SOI in a given device is, however, often both hard to predict theoretically and probe experimentally. Here, we develop a detailed theoretical connection between the leakage current through a double quantum dot in Pauli spin blockade and the underlying SOI in the system. We present a general analytic expression for the leakage current, which allows to connect experimentally observable features to both the magnitude and orientation of the effective spin--orbit field acting on the moving carriers. Motivated by the large recent interest in hole-based quantum devices, we further zoom in on the case of Pauli blockade of hole spins, assuming a strong transverse confinement potential. In this limit we also find an analytic expression for the current at low external magnetic field, that includes the effect of hyperfine coupling of the hole spins to randomly fluctuating nuclear spin baths. This result can be used to extract detailed information about both hyperfine and spin--orbit coupling parameters for hole spins in devices with a significant fraction of non-zero nuclear spins.
