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