Engineering the spin polarization of one-dimensional electrons.
Engineering the spin polarization of one-dimensional electrons.
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设计一维电子的自旋极化。
DOI：
10.1088/1361-648x/aaa7ce
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Yan C
中科院分区：
文献类型：
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作者：
Yan C
我们介绍了磁聚焦对一维通道内自旋极化的控制监测结果，以及其对调制二维GaAs电子气体中自旋轨道相互作用（SOI）的后续影响。我们证明，随着一维通道有效长度的变化，一维通道内的电子可以部分自旋极化，这与理论预测一致。当这种极化的一维电子注入二维区域时，会导致奇聚焦峰的分裂，而偶聚焦峰则不受影响（单峰）。另一方面，非极化电子不影响聚焦光谱，奇偶峰保持单峰。奇聚焦峰的分裂是直接测量一维通道内自旋极化的证据，其中每个子峰代表特定自旋态的居群。自旋分裂的确认是由聚焦峰的选择性调制决定的，这是由于在面内磁场存在的塞曼能量。我们认为二维区域的SOI被一束极化的一维电子流增强。注入一维电子自旋态的空间控制和调整SOI的可能性可能为自旋工程开辟一个新的领域，并在未来的量子信息方案中应用。
We present results of magneto-focusing on the controlled monitoring of spin polarization within a one-dimensional (1D) channel, and its subsequent effect on modulating the spin–orbit interaction (SOI) in a 2D GaAs electron gas. We demonstrate that electrons within a 1D channel can be partially spin polarized as the effective length of the 1D channel is varied in agreement with the theoretical prediction. Such polarized 1D electrons when injected into a 2D region result in a split in the odd-focusing peaks, whereas the even peaks remain unaffected (single peak). On the other hand, the unpolarized electrons do not affect the focusing spectrum and the odd and even peaks remain as single peaks, respectively. The split in odd-focusing peaks is evidence of direct measurement of spin polarization within a 1D channel, where each sub-peak represents the population of a particular spin state. Confirmation of the spin splitting is determined by a selective modulation of the focusing peaks due to the Zeeman energy in the presence of an in-plane magnetic field. We suggest that the SOI in the 2D regime is enhanced by a stream of polarized 1D electrons. The spatial control of spin states of injected 1D electrons and the possibility of tuning the SOI may open up a new regime of spin-engineering with application in future quantum information schemes.