标题： 量子点接触作为（近似）完美的自旋极化器 显示英文标题

标题： A quantum point contact as a (near) perfect spin polariser

摘要： 在本文中，我提出了一种从具有大Rashba相互作用的QPC中获得自旋极化电流的简单方法。 这种自旋极化的来源是第一个QPC子带的自旋“上”态绝热演化为第二个QPC子带的自旋“下”态。 可以通过磁聚焦装置获得这种效应的独特实验特征，其中自旋分裂磁聚焦的特征“双峰”仅在电导为$G>2e^2/h$时存在。 这些特定的磁聚焦特征出现在最近发表的实验结果中。 最后，我考虑了空穴QPCs，由于Rashba相互作用的特殊运动学结构，所需的参数对于实验实现来说要不那么有利。 显示英文摘要

摘要： In this paper, I present a simple method of obtaining spin-polarised current from a QPC with a large Rashba interaction. The origin of this spin polarisation is the adiabatic evolution of spin "up" of the first QPC sub-band, into spin "down" of the second QPC sub-band. Unique experimental signatures of this effect can be obtained using a magnetic focusing setup, with the characteristic "double" peak of spin-split magnetic focusing only present for conductances $G>2e^2/h$. These particular magnetic focusing features are present in recently publish experimental results. Finally, I consider hole QPCs, where due to the particular kinematic structure of the Rashba interaction, the required parameters are much less favourable for experimental realisation.