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arXiv · 2210.03383

Spin polarisation and spin dependent scattering of holes in transverse magnetic focussing

M. J. Rendell·S. D. Liles·A. Srinivasan·O. Klochan·I. Farrer·D. A. Ritchie·A. R. Hamilton
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Abstract

In 2D systems with a spin-orbit interaction, magnetic focussing can be used to create a spatial separation of particles with different spin. Here we measure hole magnetic focussing for two different magnitudes of the Rashba spin-orbit interaction. We find that when the Rashba spin-orbit magnitude is large there is significant attenuation of one of the focussing peaks, which is conventionally associated with a change in the spin polarisation. We instead show that in hole systems with a $k^3$ spin-orbit interaction, this peak suppression is due to a change in the scattering of one spin state, not a change in spin polarisation. We also show that the change in scattering length extracted from magnetic focussing is consistent with results obtained from measurements of Shubnikov-de Haas oscillations. This result suggests that scattering must be considered when relating focussing peak amplitude to spin polarisation in hole systems

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M. J. Rendell, S. D. Liles, A. Srinivasan, O. Klochan, I. Farrer, D. A. Ritchie, A. R. Hamilton. 2022-10-07. Spin polarisation and spin dependent scattering of holes in transverse magnetic focussing. https://doi.org/10.1103/physrevb.107.045304

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