We identify theoretically the possibility to determine the Rashba spin-orbit coupling strength in InSb nanowire quantum dots by measuring the magnetic susceptibility of the two-electron system in a double quantum dot. To realistically describe such a system, we study the role of finite temperature and the interaction of the double quantum dot spins with the nuclear environment. Magnetic susceptibility, a quantity dependent on the relative angle between the magnetic and the spin-orbit field, reaches a maximal value when the spin-orbit and magnetic field are parallel/antiparallel to each other. We show that the dependence of the peak with respect to the magnetic field orientation, being a controllable quantity, can be used to extract the value of the Rashba parameter in materials with strong spin-orbit coupling. Since the strength of the Rashba parameter is independent of the confinement along the nanowire axis, the determined value can be used in configurations with different gating potential profiles and the number of electrons trapped inside the quantum dot system.

我们从理论上确定了通过测量双量子点中双电子系统的磁化率来确定InSb纳米线量子点中Rashba自旋轨道耦合强度的可能性。为了现实地描述这样一个系统，我们研究了有限温度的作用以及双量子点自旋与核环境的相互作用。当自旋轨道和磁场彼此平行/反平行时，磁化率（取决于磁场和自旋轨道场之间的相对角度的量）达到最大值。我们表明，峰值相对于磁场方向的依赖性是可控制的，可以用来提取具有强自旋轨道耦合的材料中Rashba参数的值。