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In two-dimensional electron systems confined to wide AlAs quantum wells,composite fermions around the filling factor $\nu$ = 3/2 are fully spinpolarized but possess a valley degree of freedom. Here we measure the energyneeded to completely valley polarize these composite fermions as a function ofelectron density. Comparing our results to the existing theory, we find overallgood quantitative agreement, but there is an unexpected trend: The measuredcomposite fermion valley polarization energy, normalized to the Coulomb energy,decreases with decreasing density.

Density dependence of valley polarization energy for composite fermions