论文标题
孔电压依赖性rashba旋转在孔横向磁心焦点中
Gate voltage dependent Rashba spin splitting in hole transverse magnetic focussing
论文作者
论文摘要
二维系统中电荷载体的磁焦点提供了质谱仪的固态版本。在存在自旋轨道相互作用的情况下，第一个聚焦峰分成两个自旋依赖峰，从而可以使用焦点来测量自旋极化和自旋轨道相互作用的强度。在孔系统中，RASHBA自旋轨道项的K^3依赖性允许使用在整个顶部门上施加的电压在现场更改旋转的空间分离。在这里，我们证明这可用于控制磁焦峰的分裂。此外，我们将焦点分裂与Shubnikov-De Haas振荡和K.P带结构计算所预测的峰进行比较。我们发现，聚焦峰分裂的始终比预期的要大，这表明需要进一步的工作来理解旋转依赖的磁聚焦。
Magnetic focussing of charge carriers in two-dimensional systems provides a solid state version of a mass spectrometer. In the presence of a spin-orbit interaction, the first focussing peak splits into two spin dependent peaks, allowing focussing to be used to measure spin polarisation and the strength of the spin-orbit interaction. In hole systems, the k^3 dependence of the Rashba spin-orbit term allows the spatial separation of spins to be changed in-situ using a voltage applied to an overall top gate. Here we demonstrate that this can be used to control the splitting of the magnetic focussing peaks. Additionally, we compare the focussing peak splitting to that predicted by Shubnikov-de Haas oscillations and k.p bandstructure calculations. We find that the focussing peak splitting is consistently larger than expected, suggesting further work is needed on understanding spin dependent magnetic focussing.
