Observation of orientation- and k-dependent Zeeman spin-splitting in hole quantum wires on (100)-oriented AlGaAs/GaAs heterostructures

ORAL

Abstract

We will present our recent study the Zeeman spin-splitting in hole quantum wires oriented along the $[011]$ and $[01\overline{1}]$ crystallographic axes of a high mobility undoped (100)-oriented AlGaAs/GaAs heterostructure. Our data shows that the spin-splitting can be switched `on' (finite $g^{*}$) or `off' (zero $g^{*}$) by rotating the field from a parallel to a perpendicular orientation with respect to the wire, and the properties of the wire are identical for the two orientations with respect to the crystallographic axes. We also find that the $g$-factor in the parallel orientation decreases as the wire is narrowed. This is in contrast to electron quantum wires, where the $g$-factor is enhanced by exchange effects as the wire is narrowed. This is evidence for a $k$-dependent Zeeman splitting that arises from the spin-$\frac{3}{2}$ nature of holes.

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Authors

  • Adam Micolich

    • School of Physics, University of New South Wales, Sydney NSW 2052, Australia

  • Jason Chen

    • School of Physics, University of New South Wales, Sydney NSW 2052, Australia

  • Oleh Klochan

    • School of Physics, University of New South Wales, Sydney NSW 2052, Australia

  • Alex Hamilton

    • School of Physics, University of New South Wales, Sydney NSW 2052, Australia

  • Theodore Martin

    • School of Physics, University of New South Wales, Sydney NSW 2052, Australia

  • Lap-hang Ho

    • School of Physics, University of New South Wales, Sydney NSW 2052, Australia

  • Ulrich Zuelicke

    • Institute of Fundamental Sciences, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand

  • Dirk Reuter

    • Angewandte Festkorperphysik, Ruhr-Universitat Bochum, D-44780 Bochum, Germany

  • Andreas Wieck

    • Angewandte Festkorperphysik, Ruhr-Universitat Bochum, D-44780 Bochum, Germany