Anomalous spin polarization of GaAs two-dimensional hole systems

R. Winkler, E. Tutuc, S. J. Papadakis, S. Melinte, Mansour Shayegan, D. Wasserman, Stephen Aplin Lyon

Research output: Contribution to journalArticle

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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 an 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.

Original languageEnglish (US)
Article number195321
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number19
DOIs
StatePublished - Nov 15 2005

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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