Anomalous spin polarization of GaAs two-dimensional hole systems

R. Winkler, E. Tutuc, S. J. Papadakis, S. Melinte, M. Shayegan, D. Wasserman, and S. A. Lyon
Phys. Rev. B 72, 195321 – Published 11 November 2005

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=32.

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  • Received 14 June 2005

DOI:https://doi.org/10.1103/PhysRevB.72.195321

©2005 American Physical Society

Authors & Affiliations

R. Winkler1,2, E. Tutuc2, S. J. Papadakis2, S. Melinte2, M. Shayegan2, D. Wasserman2, and S. A. Lyon2

  • 1Institut für Festkörperphysik, Universität Hannover, Appelstrasse 2, D-30167 Hannover, Germany
  • 2Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA

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Issue

Vol. 72, Iss. 19 — 15 November 2005

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