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Anomalous Spin Polarization of GaAs Two-Dimensional Hole Systems

R. Winkler·E. Tutuc·S. J. Papadakis·S. Melinte·M. Shayegan·D. Wasserman·S. A. Lyon
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Abstract

We report measurements and calculations of the spin-subband depopulation, induced by a parallel magnetic field, of dilute GaAs two-dimensional (2D) hole systems. The results reveal that the shape of the confining potential dramatically affects the values of in-plane magnetic field at which the upper spin subband is depopulated. Most surprisingly, unlike 2D electron systems, the carrier-carrier interaction in 2D hole systems does not significantly enhance the spin susceptibility. We interpret our findings using a multipole expansion of the spin density matrix, and suggest that the suppression of the enhancement is related to the holes' band structure and effective spin j=3/2.

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R. Winkler, E. Tutuc, S. J. Papadakis, S. Melinte, M. Shayegan, D. Wasserman, S. A. Lyon. 2005-06-20. Anomalous Spin Polarization of GaAs Two-Dimensional Hole Systems. https://doi.org/10.1103/physrevb.72.195321

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