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

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

References in corpus (7)

• Imaging Magnetic Focusing of Coherent Electron Waves
• Fabrication and characterisation of ambipolar devices on an undoped AlGaAs/GaAs heterostructure
• Controlled spatial separation of spins and coherent dynamics in spin-orbit-coupled nanostructures
• Magnetic focusing of charge carriers from spin-split bands: Semiclassics of a Zitterbewegung effect
• Magnetic breakdown of cyclotron orbits in systems with Rashba and Dresselhaus spin-orbit coupling
• Gate voltage dependent Rashba spin splitting in hole transverse magnetic focussing
• Influence of device geometry and imperfections on the interpretation of transverse magnetic focusing experiments

Cited by in corpus (2)

• Ballistic transport spectroscopy of spin-orbit-coupled bands in monolayer graphene on WSe${}_2$
• Transverse magnetic focusing in two-dimensional hole gases