Anomalous Spin Polarization of GaAs Two-Dimensional Hole Systems

Details Anomalous Spin Polarization of GaAs Two-Dimensional Hole Systems Anomalous Spin Polarization of GaAs Two-Dimensional Hole Systems

2005-02-23

arxiv.org/abs/cond-mat/0502559v2

Phys. Rev. B 72, 195321 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 4 figures, substantially extended discussion of results

Scientific paper

10.1103/PhysRevB.72.195321

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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