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Temperature dependence of the spin polarization of a quantum Hall ferromagnet.

The absolute spin polarization of a two-dimensional electron gas has been measured as a function of temperature at the ν = 1 quantum Hall state by magnetoabsorption spectroscopy. We find that the electrons become fully polarized as T → 0 and that the loss of spin polarization over the temperature regime of 500mK to 12K is consistent with a recently proposed continuum quantum ferromagnet model of the spin thermodynamics of the ν = 1 QHE state.