期刊
PHYSICAL REVIEW B
卷 105, 期 24, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.105.245305
关键词
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资金
- Australian Government through the Australian Research Council Discovery Project Scheme
- UKRI Engineering and Physical Sciences Research Council [CE170100039]
Magnetic focusing can be used to measure spin polarization and the strength of spin-orbit interaction in two-dimensional systems. By controlling the spatial separation of spins, the splitting of magnetic focusing peaks can be controlled.
Magnetic focusing 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 focusing peak splits into two spin dependent peaks, allowing focusing to be used to measure spin polarization and the strength of the spin-orbit interaction. In hole systems, the k3 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 focusing peaks. Additionally, we compare the focusing peak splitting to that predicted by Shubnikov???de Haas oscillations and k ?? p band-structure calculations. We find that the focusing peak splitting is consistently larger than expected, suggesting further work is needed on understanding spin dependent magnetic focusing.
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