Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 13, Pages 2858-2861Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.2858
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Using a novel technique, we make quantitative measurements of the spin polarization of dilute [(3.4-6.8) x 10(10) cm(-2)] GaAs (311)A two-dimensional holes as a function of an in-plane magnetic field. As the field is increased the system gradually becomes spin polarized, with the degree of spin polarization depending on the orientation of the field relative to the crystal axes. Moreover, the behavior of the system turns from metallic to insulating before it is fully spin polarized. The minority-spin population at the transition is similar to8 x 10(9) cm(-2), close to the density below which the system makes a transition to an insulating state in the absence of a magnetic field.
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