In-plane field dependence of spin resolved magnetic focussing in 2D hole systems
Abstract
The spin orbit interaction allows for all-electrical control of spin. Transverse magnetic focussing provides a method for spatially separating spins so that spin dynamics can be studied. We perform transverse magnetic focussing experiments of heavy holes in highly symmetric (100) GaAs/AlGaAs heterostructures, and observe two clear spin resolved focussing peaks. It is tempting to use the area of the focussing peaks as a measure of the spin polarisation, however we find that the peak area is extremely sensitive to in-plane magnetic fields - as small as 0.1T. Additionally, we find that the peak area is asymmetric when the in-plane field direction is reversed, and this asymmetry is conserved under Onsager time reversal. This suggests that there is an additional non-spin polarisation effect at play, and that care must be taken when using focussing techniques to measure spin.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..MARS33013R