In-plane field dependence of spin resolved magnetic focussing in 2D hole systems

ORAL

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.

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Presenters

  • Matthew Rendell

    Univ of New South Wales

Authors

  • Matthew Rendell

    Univ of New South Wales

  • Scott Liles

    Univ of New South Wales

  • Ashwin Srinivasan

    Univ of New South Wales

  • Oleh Klochan

    Univ of New South Wales, School of Physics, University of New South Wales

  • Ian Farrer

    University of Sheffield, Department of Physics, University of Cambridge, Electronic and Electrical Engineering, University of Sheffield, Electrical Engineering, University of Sheffield, Department of Electronic and Electrical Engineering, University of Sheffield, Physics, Sheffield University

  • David A Ritchie

    University of Cambridge, Department of Physics, University of Cambridge, Semiconductor Physics, University of Cambridge, Physics, University of Cambridge, Department of Physics, Cavendish Laboratory, Physics, Cambridge University

  • Alex R Hamilton

    School of Physics, University of New South Wales, Univ of New South Wales, University of New South Wales