Spin polarization and g-factor of a dilute GaAs two-dimensional electron system

Abstract

The effective g-factor ($g^{\ast }$) of a dilute interacting two-dimensional electron system is expected to increase with respect to its bare value as the density is lowered, and to eventually diverge as the system makes a transition to a ferromagnetic state. We report here measurements of $g^{\ast }$ in dilute (density 0.8 to 6.5 $\times 10^{10}$cm${}^{-2}$), high-mobility GaAs two-dimensional electrons from their spin polarization in a parallel magnetic field. The data reveal a surprising trend. While $g^{\ast }$ is indeed significantly enhanced with respect to the band g-factor of GaAs, the enhancement factor decreases from about 6 to 3 as the density is reduced.

4 pages, 5 figures; minor modificatio with respect to the 1st version; published

References in corpus (1)

• In-plane magnetic field-induced spin polarization and transition to insulating behavior in two-dimensional hole systems

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